I am building another 338 Lapua based rifle. I have a Stiller 338 action and ended up picking up a Rock Creek 1:10 twist barrel pretty cheap that should finish at about 34 inches. I am considering building a wildcat either Rouge, Ackley or something close. This is also my first time going with an improved or wildcat cartridge. I have heard several people say I could fire my regular 338 Lapua ammo using standard loads and this would fireform my brass. I have heard others say you have to use a light load t o fireform the brass.
Anyway I am curious what version of the cartridge would yeild the best accuracy, velocity and possibly be able to fire standard 338 Lapua loads without a huge loss in accuracy. Also if anyone has tried a barrel this long and possible velocity gains from using 50bmg powder or 20mm cannon powders. Both are very slow burning. I will be trying 300gr bullets and shooting 1000 yds possibly trying longer for fun. I know the twist may be a little slow for lathe turned bullets. any other recommendations would be appreciated.
Anyway I am curious what version of the cartridge would yeild the best accuracy, velocity and possibly be able to fire standard 338 Lapua loads without a huge loss in accuracy. Also if anyone has tried a barrel this long and possible velocity gains from using 50bmg powder or 20mm cannon powders. Both are very slow burning. I will be trying 300gr bullets and shooting 1000 yds possibly trying longer for fun. I know the twist may be a little slow for lathe turned bullets. any other recommendations would be appreciated.