Re: LR Mag primers in standard loads?
Both my 20" 308 bolt rifle likes mag primers more than standard with Varget. Almost feels like with the slow burner & shorter barrel, the powder needs more of a jump start. Recoil is more mild with the mag primer suggesting I'm getting a more complete burn.
My 22.75" 308 bolt doesn't shoot well with mag primers.
Just a preference thing, I would not use mag primers in 308 semi-auto loads.