I'm hijacking this thread. Been reloading for a year and a half and all the brass I've used was from factory ammo I fired and saved. I just bought 100 pieces of PPU 6.5x55 new brass and wonder if I need to size it first? The rifle I load this cartridge for is a CZ 550 American.
You will get varying replys.....I personally check overall length and lightly chamfer the neck but don't resize new brass.
I've tried about every way imaginable for standard hunting rifles with factory barrels including a CZ 550 7X57 that shot 1/2" groups at 100 yds. I've never quantified any difference in accuracy.
Shod
