Originally Posted by Broz
Hmmmm, bold statement there. I am fully aware of the capabilities of the 338-378, as well as its shortcomings. I am going off memory here but I believe the 338-378 has an H20 case capacity of around 122 gr. Now if we had a Lapua based case that was equal to it or even a few grains more, would you still stand behind your statement?
Lets not forget the much stronger Lapua brass that can be safely loaded to levels well above the Norma brass. Also the shorter fatter more efficient Lapua case design. Now lets consider the +P throat from Defensive Edge???? I like the 338-378 and have been a Weatherby fan most of my life. But it is possible your post statement is as dated as some of the powders you spoke of. My new rifle in 338 Terminator +P was not something we did on a whim without research.
A friend sent me this today for my TRG-42 LM, I am a Lapua fan because it's a MIlitary round, but it is not even close in capacity to the Wby. which I could care less about, the recoil is already a lot with a 14 1/2 lbs. gun.
Cartridge : .338 Lapua Mag.
Bullet : .338, 300, Sierra HPBT LR MK 9300 G7 Litz
Useable Case Capaci: 92.057 grain H2O = 5.977 cm³
Cartridge O.A.L. L6: 3.681 inch = 93.50 mm
Barrel Length : 27.0 inch = 685.8 mm
I chose to brake in the barrel w/IMR 4350 since Sierra showed in a most accurate, which in my case it was rather accurate, but slow as snails pace; 78 grains only produced 2525 fps but put three out of twenty in the same hole even with cleaning the barrel.
I have on hand H1000, RL 22, 25 and 33, IMR 7828 and 7828 ssc, N170, 780 Supreme and almost anything else except the really slow stuff.... US869, and such. What would you suggest I try for shear accuracy and nothing else, bullet drop means almost nothing. I have 28.5 Mils of scope adjustment even with the 2525 fps 300 SMK round.