I watched a series on History channel about the US Army marksmanship unit re the rifles they use (They build their own) and found it interesting that they handload the ammo used with 220 gr bullets. No reason was given for the use of this heavy bullet and I was wondering why they would use this heavy a bullet in a .30 caliber? Also showed the scales when the powder was trickled in to compete the charge and it was 72.0grs - any ideas on what sort of powder would use a charge weight of 72.0gr in the 300 Winchanger w/ 220gr bullet? IMR4350??? Any ideas or comments?
Regards,

Trapper. The 220gr. matchkings have been receiving excellent reviews for outstanding accuracy. There was a writeup in Precision Shooting several months ago on this. Unfortunately they are only available in boxes of 500! I suspect that the 72 gr. load might be RL22. A load slightly greater than this is outstanding with 180 NP's in my 300WM.
peter.

The 220-grain Matchking is probably being loaded for 1000-yard shooting.

I'd expect that with a 72-grain charge with a 220-grain bullet, they're probably using H1000, Reloder 25 or possibly IMR7828. For many rifles, 72 grains of IMR4350 is slightly beyond maximum in a .300 Winchester Magnum with the 180-grain bullet. Put that much 4350 behind a 220-grain bullet and... I don't want to even imagine it.