Have gone through a case of those same rounds with various CZC and CGW modified pistols (steel, alloy, polymer frames) without any hiccups. Sorry, I don't recall recoil spring weights that you asked about but I'm pretty sure at least a couple of those were running recoil and main spring weights on the lesser end of the scale. Plus, S&B is the most prevalent ammo brand in the ?R (naturally, as the homegrown product) although it's now owned by the Brazilian CBC group. Good shooting!