If it is new, I would contact Savage. It could be a short chamber with minimal headspace.

I personally headspaced one gun and shot a box of Hornady. Found a couple rounds that were hard to chamber. One round actually wouldn't chamber. A box of Winchester were all hard to chamber, and one wouldn't.

The variations within a box could have given you the result. And, the same with your full length sizing.

Could be other explanations too.

As for my magnum, I use a full length die and bump back the shoulder.

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