Thanks guys.
Not that worried about temperature senativity.
I consider it a talking point for the sales force.
Pretty much load develop and check drops close to season. So the temps are not that much different.
Have extensive experience with Rel 22 in the 300 win mag.
Never a problem.
The copper fouling attivies in the powders I've messed with ,, Rel 26, AR COMP. N550, Staball. All lay down alot of black cchitt. That requires more elbow grease to remove.
Less copper ,yes. But more work to remove, clean.
I was just looking for a little collective wisdom on the fire.
For a cartridge I have not messed with for a very long time

Dave

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Only accurate rifles are interesting.