ORIGINAL: Pglasgow

It might do well to put all this 70 grains 270 PB into perspective. First it seems clear that LaneNebraska is using a .45 cal. So first off comparing it to a 70 grain charge in a 50 cal. just isn't fair. First, lets convert the 70 grains to an equivalent in .50 cal. Just multiply by the percentage increase in bore area. 24% X 70= 16.8. Add that to 70 grains and we've got 87 grains of JSG. Doesn't JSG perform like 777 3f? If so lets multiply that by 115%(for the fact 777 should be reduced by 15%)and get 100 grains. Now lets convert for3f and multipy 100 grains by 110%. We get 110 grains.Soto get the same velocity from a .50 cal bullet of the same sectional density, oneneedsin the neighborhood of110 grains RS or 2f BP.

Whats a 50 cal bulletof the same sectional density as a 270 .45cal bullet? Around 335 grains. So a 338 platinum PBwith 110 grains of RS is equivalent in muzzle velocity to a 270 PB with 70 grains JSG. If 110 grains is driving a 338 too fast in a 50 cal. then 70 grains of JSG is driving a 270 too fastin a .45 cal. I'll let everyone be their own judge on that. But I don't think its as simple as this grainage or that grainage. It as simple as theimpact velocity, bullet weight, and profile of the hollowpoint, which maybe isn't all that simple afterall.