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Posted: 6/21/2013 1:05:23 PM EDT
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So I'm planning to build a scout rifle on the Remington 700 platform .
Now i already chose the action and what stock i would like to get but I'm not sure where to go for a custom barrel, my idea was to get a 16-18 in. bull barrel but I'm not sure what twist would be best for this I would like to reach out at absolute most 1000 -1200 Yards With that being said what twist would be best to help make that shot accurately, and how would i go about looking for this barrel ? |
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Twist rates are caliber, and to a lesser degree, bullet dependent, ie, What caliber and what weight bullet would be a good starting point.
The only custom barrel makers I have personal experience with are White Oak Armament, .223 AR specialists, and ER Shaw. I bought an ER Shaw Barrel for my Mauser build and it has been spectacular, sub-moa with every single load I've stuck in it. (admittedly few) Their barrels are very inexpensive and provide a lot of bang for the buck. My barrel was $200 to my front door, contoured, crowned, and short chambered. They also provide full service gunsmithing on most bolt rifles and will fit their barrel to your rifle. Link There are literally dozens of barrel makers out there, and ER Shaw is entry level for custom barrels, many others have much better reputations and the sky's the limit for how much barrel you want and how much money you want to spend.. Krieger, Shilen, McGowen, Brux(just set the 600 yard record), Hart, Pac-Nor, are a few that pop to mind. Who's installing? |
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Quoted:
So I'm planning to build a scout rifle on the Remington 700 platform . Now i already chose the action and what stock i would like to get but I'm not sure where to go for a custom barrel, my idea was to get a 16-18 in. bull barrel but I'm not sure what twist would be best for this I would like to reach out at absolute most 1000 -1200 Yards With that being said what twist would be best to help make that shot accurately, and how would i go about looking for this barrel ? What caliber are you expecting to get to this range out of a 16-18" barrel accurately? |
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Ideal barrel length accuracy for 308 is about 22".
Now the glitch, 308 goes subsonic well before 1K, so as the super sonic shock wave moves from behind the tail ,to the tip, this destabilizes the bullet. So a longer barrel will gain you some speed to get the bullet farther out before it goes subsonic, and if ridgit enough, not too much sacrifice in accuracy, but your still not pushing 1K as tack driver out of a 308 round. Out of a 18" barrel, you better focus on what the barrel will do short range instead. And as stated, this all comes down to what bullet weight and type, and the speed of the round to first determine the needed twist, then the chamber and leade as well. Simply, with that short of barrel, you better be focusing on 500 yard and inwards. At 500 yards, the round has only dropped around 60" and what most scopes can be adjusted for. At 1k, the bullet has dropped over 400", and well past what you can adjust a scope for a 100 yard zero and re-adust it for that range. |
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Whoops. RIF. I'll leave my assumptive comments anyway - There is no way I would put a 16 or 18 inch barrel on a rifle for .308 Win, especially for long shots which are going to need all the speed available to start. Plus, the gun will be an ungainly, butt heavy mess unless it's weighted up with a heavy barrel and maybe a bipod, which defeats the goal of a scout rifle due to the gun's weight. For every inch the barrel is shortened, count on a loss of muzzle velocity of 15 to 35 fps, about 25 fps on average. The loss could be greater. That matters with this cartridge. Use a normal length #3 contour barrel (22 to 24 inches long) from a quality maker. Plan to shoot 175 grain MatchKings (and Sierra #2156 MK's), but allow for 190 grain bullets, just in case. Either follow the gunsmith's advice about rifling twist, someone local that you know is an experienced shooter that has bought custom barreled guns, or at minimum check the chart at Brownell's. I avoided .308 Win for a long time because I think it's a mediocre albeit popular cartridge. It's popular due to its government pedigree, I'll bet if we had never seen the M-14 rifle, no one would have ever developed a similar wildcat cartridge. It's easy to load and we have a great selection of bullets and good cases available, so it maintains a position of popularity, and the availability of really high BC bullets has made the cartridge pretty good, but I still think there are better ballistic alternatives for just about every application. I don't think that, I know it. Anyway, I plan to shoot three of my rifles chambered for .308 Win this afternoon. 
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| I recommend Bartlien Barrels out of Jackson, Wi. I have one of their barrels on my AR10 and it shoots great. GA Precision uses them for their guns and if its good enough for those guys, it's good enough for me. :) GAP did my work and it turned out great. I was able to visit Bartliens facility a few years back and they showed me around a bit and were very helpful. Good luck! |
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