About 2 years ago, I bought some Winchester 30-30 150gr. softpoint ammo. There was 1/10 of an inch difference in the case lengths. Overall length was the same so all the bullets were seated at different points. I took pics and sent them to Winchester with the box info. I informed them that the recoil varied from cartridge to cartridge. They informed me that since the overall length was the same, it was nothing to worry about. The only winchester ammo I have bought since then is shotshells. I have had no problems with that.

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Joe