Originally Posted by sniperboy
Hi to all, hope everyone had a good easter.
Can anyone tell me of a powder that will burn fast enough for a 338 lapua in a 25 inch barrel? I am currently using vithavori n170 but i dont think its burning it fast enough.
I am using 300g smk projectiles and the rate of twist of the barrel is 1-10.
I have tried US 869, Retumbo and Viht N-170. The Vihtavuori powder was my go to load and I got good consistency FPS @ 2675FPS ( low spreads etc)...I used 89 grains but I have a 28.5 inch barrel...Now I use Retumbo , 90 g and get about 2750...We switched to Retumbo because we were trying to simplify our loading procedure with fewer powders and using the same powder for different magnun rifles ( Lapua, 30-338, 300RUM ) and we did it! It makes things a lot easier...I think I remeber that Vihtavuori is a temperature "insensitive" powder like the extreme from Hodgdon. BTW Quickload says that with 90 grains N-170 in a 25 inch barrel there remains 1.84% of the powder unburned...IS that why you thought you needed a faster powder or were you meaning a slower powder? Shawn has had good luck using H1000, and has gotten a little less velocity but excellent consistency.good luck 30-338