I just had a trigger job done and my local smith had a chart of pull weights that varied by primer brand. CCI was at something like 56oz on .38 special vs Winchester SP at 46oz (these numbers are specific to how he does his action jobs and should only be used as an example in this case). Those are some of the hardest primers you can buy. I would try to check your trigger pull and give your strain screw a nudge to see if that helps. If it started during your off season deep cleans you could’ve bumped that screw a little and a little is all it takes when you’re on the edge with your pull weight.