bjld said:
Will a 300 Weatherby with a 30" 1:10 twist barrel stabilise a 240 grain Match King?
Yes. I wouldn't be surprized if that wasn't the favorite twist for 240s with the larger cases.
Will a longer barrel give much better performance?
Depends on what you mean by "much better." Short answer is no, but that puts the emphasis on "much." If you feel another 50-70 fps or so is worthwhile, you could go to 32 inches. Everything's a compromise though. If weight is a factor, I'd probably not do it.
Does anyone have any good suggestions for powder? H1000?
Been a while since I used 240s. I used Rel-22 (Norma MRP is the same powder under Norma Packaging). This was before Rel-25 was available. As an aside, the Rel-22 we got those days -- mid/late 1990s --was a tad slower than what you get today.
If you have access to a bunch of powder availble, I'd try a few 3-shot groups with everything from 4831 & slower. Always start with a very safe load & work up a bit. The 3-shot groups are to rule things out, anything that shows promise gets more development.
I wouldn't go out & buy all these powders, too expensive. The point is simply you can't tell in advance what will work best. I'll bet a number of people will come on & post their favorite loads. Usually worth trying somebody else's favorite powder, but never any guarantees, each barrel is a different critter.
