Get the extra power hammer spring from BELLM and check your headspace. Should be less than .005" at most. Two measurements are needed. Gap between frame and barrel plus the recess from the face of barrel to the face of brass case. Headspace can be fixed if that is the problem. You will need a set of feeler gages to close on the barrel and frame for the first measurement. The butt end of a dial caliper can be used to see how far your brass is sitting below the barrel face. Add these two measurements together to get the total headspace.
I have everything on the way from Bellm:
feeler gauge
51# hammer spring
shim kit
dial gauge
