Hi - sorry, yet to revisit the range but, having now received my Warne Magne-Tech mounts, I'm about to fettle these onto the S20 and that'll mean hopefully on the range on 7 Feb to re-zero. I'll try both types on ammo and the new/old mags again and will let you know. I cannot get to the range sooner@wytonpjs, did the new mag fix your feed problems? I have a very early S20 with the plastic insert to the mag, but it is still problematic, so wondering about a new magazine too. Cheers.