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06-02-2018, 08:35 AM
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35x300rum
I've made a decision that I'm gonna rebarrel my rem 700 xcr11 to a 35x300rum. Would a 26" barrel be optimal and what twist rate would I be wanting?
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06-02-2018, 08:51 AM
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Join Date: May 2007
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I would go no longer than 23”.
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06-02-2018, 09:22 AM
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Any reason chuck?
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06-02-2018, 11:02 AM
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Join Date: Sep 2008
Location: Parkland County, AB
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What application are you considering ?
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When applied by competent people with the right intent, common sense goes a long way.
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06-02-2018, 12:24 PM
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Quote:
Originally Posted by Salavee
What application are you considering ?
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Near and far plain ol smacking things
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06-02-2018, 02:02 PM
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Join Date: Sep 2008
Location: Black Dually
Posts: 259
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Quote:
Originally Posted by Norwest Alta
Any reason chuck?
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I'd guess that the expansion ratio of that cartridge would be a major factor. Don't need the extra barrel volume because the powder is all burnt up by then. Plus I'd be more concerned with the handling characteristics for smacking near things in brushy areas. Good luck with the build that sounds like a beast!
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06-02-2018, 02:05 PM
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Join Date: May 2007
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Quote:
Originally Posted by Soulcousin
I'd guess that the expansion ratio of that cartridge would be a major factor. Don't need the extra barrel volume because the powder is all burnt up by then. Plus I'd be more concerned with the handling characteristics for smacking near things in brushy areas. Good luck with the build that sounds like a beast!
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That’s pretty much it.
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“I love it when clients bring Berger bullets. It means I get to kill the bear.”
-Billy Molls
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06-02-2018, 02:46 PM
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Join Date: Dec 2008
Location: Camrose
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The resulting cartridge would be similar to the 360 Imperial Magnum which existed as part of the Imperial Magnum line of cartridges. There is some reloading data on line that should provide a good starting point. The 360 Magnum rifles were sold with 26" barrels, and they did produce enough extra velocity over the 24" test barrels, that I would go 26", if I built one.
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Last edited by elkhunter11; 06-02-2018 at 02:52 PM.
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06-02-2018, 03:15 PM
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Join Date: Sep 2008
Location: Parkland County, AB
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Look up.358 UMT. Somebody's been there.
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When applied by competent people with the right intent, common sense goes a long way.
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06-02-2018, 04:27 PM
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Join Date: May 2007
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Quote:
Originally Posted by elkhunter11
The resulting cartridge would be similar to the 360 Imperial Magnum which existed as part of the Imperial Magnum line of cartridges. There is some reloading data on line that should provide a good starting point. The 360 Magnum rifles were sold with 26" barrels, and they did produce enough extra velocity over the 24" test barrels, that I would go 26", if I built one.
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I’m curious if you have those numbers.
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“I love it when clients bring Berger bullets. It means I get to kill the bear.”
-Billy Molls
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06-02-2018, 04:33 PM
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Location: Calgary
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Quote:
Originally Posted by Norwest Alta
I've made a decision that I'm gonna rebarrel my rem 700 xcr11 to a 35x300rum. Would a 26" barrel be optimal and what twist rate would I be wanting?
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Awesome call imo
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06-06-2018, 11:38 AM
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Join Date: Jun 2016
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Quote:
Originally Posted by Stinky Coyote
Awesome call imo
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Just dropped it off. Going with a 26" shillen barrel. Should be a gooder.
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06-06-2018, 01:03 PM
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Join Date: Feb 2018
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What bullets are you thinking? There's a 225 accubond, 225 barnes tipped tsx. Likely wanting a 12 twist?
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06-06-2018, 01:40 PM
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Join Date: Nov 2009
Location: East Central Alberta
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In most cases, there is a direct relationship between barrel length and velocity, with longer barrels producing higher velocities ... however, there is a point of diminishing benefit. It is my understanding that virtually all the powder is burned within a few inches of the chamber but the hot gas produced continues to expand, which is then then the driving force behind the bullet. Is my understanding correct?
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06-06-2018, 02:11 PM
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Ruby the gun Smith has built a few of them. I more or less left it to him except with the reminder that it is my money he's spending. Lol. I would like to shoot Barnes.
260 the smith said that a 26" barrel will work very well with 100grs of powder being burnt.
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06-06-2018, 02:25 PM
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Join Date: Sep 2008
Location: Parkland County, AB
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Quote:
Originally Posted by 260 Rem
In most cases, there is a direct relationship between barrel length and velocity, with longer barrels producing higher velocities ... however, there is a point of diminishing benefit. It is my understanding that virtually all the powder is burned within a few inches of the chamber but the hot gas produced continues to expand, which is then then the driving force behind the bullet. Is my understanding correct?
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I believe it is peak pressure that is reached within 3-5 inches, not 100 % powder burn. Depending on the burn rate, powder continues to burn, sometimes even after the bullet has exited the barrel, but ideally, a few inches prior to exit. Immediately after peak pressure, velocity continues to increase due to the expanding gasses. After projectile acceleration decreases to a pressure equal the projectiles resistance, a rapid deceleration rate begins due primarily to barrel friction. Interestingly, in most cases, all this happens within 2 milliseconds .
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When applied by competent people with the right intent, common sense goes a long way.
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06-06-2018, 02:58 PM
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Quote:
Originally Posted by Salavee
I believe it is peak pressure that is reached within 3-5 inches, not 100 % powder burn. Depending on the burn rate, powder continues to burn, sometimes even after the bullet has exited the barrel, but ideally, a few inches prior to exit. Immediately after peak pressure, velocity continues to increase due to the expanding gasses. After projectile acceleration decreases to a pressure equal the projectiles resistance, a rapid deceleration rate begins due primarily to barrel friction. Interestingly, in most cases, all this happens within 2 milliseconds .
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This is pretty much what Greg told me. Shorter barrel with that much powder would mean fire and brimstone out the end of the pipe. Longer barrel means more brimstone then fire.
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06-06-2018, 02:59 PM
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Join Date: Dec 2007
Location: Fort Saskatchewan
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glad you went for it, the 26'' barrel would be my choice as well.
Im shooting the 200gr ttsx in my 358STA, I wish I could find the 225gr accubond. I did find some 200gr accubonds and bought 4 boxes but haven't tried them yet.
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06-06-2018, 03:18 PM
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Join Date: Dec 2011
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Quote:
Originally Posted by Norwest Alta
Just dropped it off. Going with a 26" shillen barrel. Should be a gooder.
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Bang on and good choice,you will enjoy it more than you think,best of luck.
JD
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06-06-2018, 04:07 PM
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Quote:
Originally Posted by buckbrushoutdoors
glad you went for it, the 26'' barrel would be my choice as well.
Im shooting the 200gr ttsx in my 358STA, I wish I could find the 225gr accubond. I did find some 200gr accubonds and bought 4 boxes but haven't tried them yet.
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If you try Corlanes they might have some. If they do the kitchen boss is heading your way next weekend she could get them to the big smoke.
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06-06-2018, 04:16 PM
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Quote:
Originally Posted by JD848
Bang on and good choice,you will enjoy it more than you think,best of luck.
JD
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Thanks
It’ll be hard to give it a chance because of my ol faithful 338 wm but I’m looking forward to it. Should be done for a reasonable price as well because I told him that I’m in no hurry. Figured he might be able to find a barrel on sale if we wait. The muzzle brake I’ve got will work. He just has to open it up. Figured the xcr action shouldn’t need any blueprinting but would have to change the feed ramp angle.
Gotta decide now what I’ll use for optics. The original scope is a bushnell 6500 2.5-16 x42. I’m not a big bushnell fan. I’ve also got a minox 5-20x50 that might work fairly nice to see the fur fly.
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06-06-2018, 04:41 PM
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Join Date: Nov 2009
Location: East Central Alberta
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Quote:
Originally Posted by Norwest Alta
This is pretty much what Greg told me. Shorter barrel with that much powder would mean fire and brimstone out the end of the pipe. Longer barrel means more brimstone then fire.
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With the respect due gunsmiths, I wonder if they are more in tune with knowledge related to metallurgy than chemistry?
One of the questions that plagues me with regard to the ignition of “unburned powder” causing muzzle flash ... is why it would still occur if the barrel was 6” longer (or 12” or 24”? Or, why, if a faster burning powder was substituted, there would still be a muzzle flash?
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06-06-2018, 05:06 PM
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Join Date: May 2007
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Quote:
Originally Posted by Norwest Alta
This is pretty much what Greg told me. Shorter barrel with that much powder would mean fire and brimstone out the end of the pipe. Longer barrel means more brimstone then fire.
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Well, not really. How many 375 and 416 magnums are there out there with barrels less than 24”? Lots. That thinking is completely flawed.
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“I love it when clients bring Berger bullets. It means I get to kill the bear.”
-Billy Molls
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06-06-2018, 05:31 PM
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Banned
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Join Date: Jun 2016
Posts: 3,666
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Quote:
Originally Posted by chuck
Well, not really. How many 375 and 416 magnums are there out there with barrels less than 24”? Lots. That thinking is completely flawed.
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I have no idea how many are out there. The 375 hi I had was a 28" barrel. So I know of one. I'm sure it'll shoot just fine with a 26".
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06-06-2018, 05:34 PM
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Join Date: Oct 2007
Location: Cowtown, agian
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I would build it with a 24" and never look back. That's from speaking to more than a couolemfolks that run STA's and UMTs. Even the UMT's creator favors a 24" in his hunting gun. You'll see a maximum 60fps return on your extra 2" of barrel and even that is unlikely.
You'll be getting 3100fps on the top end of 250gr loads and over 3250 with a 225gr in a broken in 24" tube.
It's a bloody hammer and lauches low BC bullets.
To be honest I'd like to load as much RL22 as possible behind a 200gr TTSX and see how laser like that could be.
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06-06-2018, 05:40 PM
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Banned
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Join Date: Jun 2016
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Quote:
Originally Posted by rem338win
I would build it with a 24" and never look back. That's from speaking to more than a couolemfolks that run STA's and UMTs. Even the UMT's creator favors a 24" in his hunting gun. You'll see a maximum 60fps return on your extra 2" of barrel and even that is unlikely.
You'll be getting 3100fps on the top end of 250gr loads and over 3250 with a 225gr in a broken in 24" tube.
It's a bloody hammer and lauches low BC bullets.
To be honest I'd like to load as much RL22 as possible behind a 200gr TTSX and see how laser like that could be.
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Road trip? Lol. I haven't seen much for reloading data. I might have to subscribe to quick load? I've never used any of the rl powder but was thinking retumbo? Seems like it's readily available.
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06-06-2018, 09:44 PM
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Powder
I’d be looking at h1000 also
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06-07-2018, 12:31 AM
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Join Date: Dec 2011
Location: East Kootenays, BC
Posts: 1,169
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That is going to be a beast of a rifle! FWIW my 375 Ruger Alaskan 20" barrel is within 100 fps of 24" barrels.
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06-07-2018, 10:42 AM
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Join Date: Dec 2007
Location: Fort Saskatchewan
Posts: 3,698
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Quote:
Originally Posted by rem338win
I would build it with a 24" and never look back. That's from speaking to more than a couolemfolks that run STA's and UMTs. Even the UMT's creator favors a 24" in his hunting gun. You'll see a maximum 60fps return on your extra 2" of barrel and even that is unlikely.
You'll be getting 3100fps on the top end of 250gr loads and over 3250 with a 225gr in a broken in 24" tube.
It's a bloody hammer and lauches low BC bullets.
To be honest I'd like to load as much RL22 as possible behind a 200gr TTSX and see how laser like that could be.
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that's what my load is for the STA, 91GR of rl22 and 200gr ttsx
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06-07-2018, 10:48 AM
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Join Date: Dec 2007
Location: Fort Saskatchewan
Posts: 3,698
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my oldest boy and myself got a good bear a few weeks ago with 358STA
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