Some info here from Jon A and others.
I'm working a load right now with 240 SMK and US869. So far I have not found a load that produces/extracts more energy in the 300RUM 1-10 twist, 26" barrel than this. I'm a tad under 3000fps with Nosler brass and 103 to 103.5 grain powder load. This is a cold weather load--you'll have to reduce in warmer weather.
The 240 is a little snubby nosed so you may be able to get pretty close to the lands with factory mag. It still has as good or better BC (Jon A has done some good testing and found that it really seems to be at .640 rather than the .711 and .685 that Sierra says. http://longrangehunting.com/ubbthreads/s...part=1&vc=1
) than anything else that'll work in a 1-10 twist and packs a tremendous amount of energy when driven by US869 at or near max. I'll be over 4700ft.lbs of energy at the muzzle and I can't get that safely out of a 200 Accubond or 200 A-frame using US869 or Retumbo or RL-25.
I've also had low ES and great accuracy out of several diff. loads average at or below .5 at 100yrds. Seems like the hardest hitting most consistent accuracy combination in my rifle so far. Still have some more testing to do to settle on a load though.
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