Can you shoot a 240gr SMK out of a 30-378 weatherby Accumart V that has a 1:10 twist?? Will it stabilize the bullet? I'm also still looking for load data that anyone might have using H50BMG or Retumbo with this bullet and cartridge combo.
There's a few post out there on this, but, yes, at the speed generated by the 300 RUM and up, it'll stabilize out to some distance beyond 1000yrds and then at some point, from what I'm told, you can't hit the side of a barn. I'm shooting 104.5g US869 and am at or just above 3K fps with a 300 RUM with bullet seated right on the lands. Haven't tried H50BMG with that bullet, but I think Retumbo may be too fast. US 869 is not especially temp stable and the load given above is a cooler weather load. Reduce as appropriate for warm weather (45 deg or above). A 30-378 should move the bullet along nicely with US 869. Good luck.
In the beginning God created the heavens and the earth. Genesis 1:1
"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia
A friend of mine who is a sniper instructor out at Ft. Hood says they run the 240 gr SMK on some of there special forces 300 win mags and they are using a 9 twist. With the 10 he said that they are stable to about 1350+/- and could go in any direction after that. With the 9 twist they are good out to 1600+. Just what he said so take it for what its worth to you.