Thread: Neck Tension Issue... I think

Are you using Brass from a single mfg/single batch of brass? If not there could be variations in seating pressures/neck tension between cases?

I once had similar problems with Remington Saum brass, (but I don't think it was neck tension-related). I switched to necked down 300 saum norma brass and no further issues. If you weigh 50 norma brass they generally fall within +/- 1 grain. The Remington was all over the show +/- 15 grains and there was big average variation between different bags of new brass too. I now only use norma or lapua brass for everything it is spendy but less hassles.