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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I would go no longer than 23”.
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Any reason chuck?
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What application are you considering ?
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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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Look up.358 UMT. Somebody's been there.
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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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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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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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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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JD |
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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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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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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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Powder
I’d be looking at h1000 also
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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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http://i722.photobucket.com/albums/w...2CF074AB9F.jpg
my oldest boy and myself got a good bear a few weeks ago with 358STA |
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