Re: Too much twist?
I responded to your note but for some reason the response did not post. So we go again. The barrel would not last long at 3,800 fps with the 107s.
The 3,800 fps load is a max load and noted only for refrence in the discussion of 1-8 VS other twist rates. I do not run max loads for anything, unless it is the most accurate load for a cartridge, which is very, very rare. The accuracy load for the Laser is just above 3,500 fps with the 107 Bergers. I suspect that the accuracy load should give the barrel a life span of many thousands of rounds as the barrel is very slow to get hot, about 10 rounds at 70 degrees.
By the way, I run several cartridges in rifles with fast twist barrels and prefer heavy bullets in most of the rifles I shoot. I have found that the long bullet to bore diameter tends to only require X velocity to be a very effective long range bullet. In that regard I am running .224 guns with 1-7 twists, 6.5 guns with 1-7.5 and 1-8 twist barrels. It is a process of allowing the bullet design to do the heavy lifting.
Oh, I think it would be good and fair to add something here. The experiance with the 6mm Sierra bullets is very odd for me as I run the Sierra .224 bullets and the 6.5 bullets at high velocity in a fast twist without any problem at all. So it would appear that the 6mm Sierra bullets have a jacket or a jacket design that does not lend them to a fast twist at high velocity or at least a velocity of 3,700 fps in a 1-8 twist barrel.
Those that beat their guns into plows will plow for those that do not.