I use Bullseye quite a bit for light 9mm loads, and will tell you that for 125 gr lead RN bullets I would drop down from those listed above. 4.9 has to be pretty hot as I started trying 4.6 and noticed primers were quite flat, just a flat out a snappy load IMO. I find 3.8 to 4.0 is the best for 125 gr. RNL bullets. I tried as low as 3.5 but had occasional failures to get slide lock on the last fired round in my Sig 226. LM