Re: 338-378 & Powders
David, that answers allot of the questions... I'm still not convinced it's the powder burn rate from case to case. The second time you shoot, the other rounds that you have loaded that increase in velocity, is the temp significantly higher than the first range session?
I'm not a fan of the run of the mill scales.. What we are doing with these rifles demands a laboratory grade scale. I used to use what you are currently using, then I spent the money to buy a Denver Instruments high end scale. You would be surprised what the difference is between loaded rounds when you compare the two.