35x300rum

[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?

[Pathfinder76]

I would go no longer than 23”.

[Norwest Alta]

Any reason chuck?

[Salavee]

What application are you considering ?

[Norwest Alta]

Originally Posted by Salavee

What application are you considering ?

Near and far plain ol smacking things

[Soulcousin]

Originally Posted by Norwest Alta

Any reason chuck?

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!

[Pathfinder76]

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!

That’s pretty much it.

[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.

[Salavee]

Look up.358 UMT. Somebody's been there.

[Pathfinder76]

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.

I’m curious if you have those numbers.

[Stinky Coyote]

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?

Awesome call imo

[Norwest Alta]

Originally Posted by Stinky Coyote

Awesome call imo

Just dropped it off. Going with a 26" shillen barrel. Should be a gooder.

[Ruby76]

What bullets are you thinking? There's a 225 accubond, 225 barnes tipped tsx. Likely wanting a 12 twist?

[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?

[Norwest Alta]

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.

[Salavee]

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?

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 .

[Norwest Alta]

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 .

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.

[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.

[JD848]

Originally Posted by Norwest Alta

Just dropped it off. Going with a 26" shillen barrel. Should be a gooder.

Bang on and good choice,you will enjoy it more than you think,best of luck.

JD

[Norwest Alta]

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.

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.

[Norwest Alta]

Originally Posted by JD848

Bang on and good choice,you will enjoy it more than you think,best of luck.

JD

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.

[260 Rem]

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.

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?

[Pathfinder76]

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.

Well, not really. How many 375 and 416 magnums are there out there with barrels less than 24”? Lots. That thinking is completely flawed.

[Norwest Alta]

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.

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".

[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.

[Norwest Alta]

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.

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.

[marky_mark]

I’d be looking at h1000 also

[brewster29]

That is going to be a beast of a rifle! FWIW my 375 Ruger Alaskan 20" barrel is within 100 fps of 24" barrels.

[buckbrushoutdoors]

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.

that's what my load is for the STA, 91GR of rl22 and 200gr ttsx

[buckbrushoutdoors]

my oldest boy and myself got a good bear a few weeks ago with 358STA