2 tenths of a grain

[Not_A_Llama]

dam there just might be 300-600 yards "Craig" man. There is nothing but sage brush for miles

So where does the long range start?

(Case capacity can actually have a profound effect on ballistics - typically, we'll measure grains of water that a case holds as a basis of comparison. )

[spqrzilla]

Federal brass? Yuck. Often too soft IMO.

[screagle2]

I wouldn't worry about it. It all goes down the pipe just the same. Empty space in the case or not.

Not really"........ A lot depends upon the load. It's pretty simple to measure case volumns and adjust accordingly. Personally, developing accurate loads for me, is for hunting more than paper.

[spittoon]

I dropped more grains from 75.2 to 75-74.8-74.6 and wow at 74.6 with a cold barrel first shot 1/4" away from the next 2 shot's in all most the same hole and i think i will stop there fed case 180gr sps reloader 22. As for the case i have a shitpot of fed case i will load for hunting as for the rp case I will just load hunting with the same loads . with the winchesters I will work up for the new heavy 300 winnie rifle . This is a lot of fun thanks for the replys

[Zombie Steve]

Yes, it matters, but less and less when you start getting into cases with as much volume as a .300 win mag. Just to illustrate... 2/10ths of a grain represents about a third of one percent change in powder charge. Unless you're already at max and are now wanting to use heavier brass, I would probably just stick with the same recipe. Keep them / shoot them separately.

[SA Friday]

Every gun is different, every caliber has it's quirks, but I've found that there is typically a powder charge change from case manufacturer to manufacturer(as long as the cases are prepped the same way). It's typically just enough to compensate for volume difference to get the bullet to the same velocity.

case life, different story.