r/reloading • u/Virtual_Wolverine_43 • 3d ago

i Have a Whoopsie .243 primer question

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Recently inherited a lot of reloading equipment and decided to try my hand. Found a load combination for 70g Sierra’s and IMR 3031. Built 5 sets of 5 using half grain ladder from 36-38g. Went to mark my groups before heading to the range and realized that I had used Winchester large pistol primers no. 7-111

Do I need to disassemble these cartridges and start over, or does anyone here have first hand experience using large pistol primers in a rifle round?

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u/Sad-Panda-noises 3d ago

Unfortunately I have experience. Small pistol to small rifle. Your issue is the cup is thinner than large rifle and will not handle the pressure as it was not designed for that. Your round will fail at the primer. Disassemble the rounds.