Home Forums Hunting & Shooting Ask The Gunwriters Weight variance in brass?

Last Spring I ordered 2 boxes of 'fancy' Nosler brass for a new 270 Winchester.

Brass showed up and luckily both boxes had matching lot #'s.


Month passes and I ordered more bullets and decide to get another box of the brass.


Different lot # this time(of course).


Load it up with the same charge as I had been using and fire away.


Now it's summer time, hot outside, and I'm getting pancaked primers and the accuracy isn't as good. Blame the temps, barrel heat, etc., and forget about it until it cools back down.


Re-test my proven load in cooler weather and get random flyers and pancaked primers on certain shots.

WTF?


Took about a minute to remember that I bought a third box.


Hmmm, the ol' light bulb is starting to warm-up...


Weigh the pancaked primer brass, 215 grains.
(edited, actually weighs 207...)

Weigh the original brass(nice round primers), 185 grains.



I'm far from a reloading expert but that seems like a lot of variance?