New to reloading so I'm unsure what to ask and I certainly don't know what I don't know.

Started in May reloading for my two 308s. Started with once fired RP brass (from those rifles) and worked up loads that made me happy. Everything was fine. Consistent groups.

Last week, my local shop was having a pre season sale and had new RP brass so I purchased a bag. Measured the brass and everything seemed to be fine. Loaded 10 rounds, COAL is where it always was, chambers without an issue. Not a single round fired in my Savage. Tried a couple of rounds a couple of times and nothing but a dented primer. I have not tried the once fired, or several times fired, brass again.

Stuck them in my Sako and every one fired.

Tried a box of factory ammo in the Savage and they all fired.

Like I said, I'm not sure what to ask. Not sure if it is a rifle or ammo issue.