There seems to be a lot of this going around, now I have a 44-40 issue. Loading for new to me Uberti Taylors Gunfighters (SAA replica). Both guns exhibit the following problem one worse than the other. Primers are backing out. My loads using 200gr RNFP Desperado Bullets, 2 or 3 times fired starline brass, Federal LPP, light roll crimp, Shuetzen FF, three loads tried, 19gr, 24gr, 32gr (full case). Gun 1 fired okay but once all five rounds were fired there was so much drag I could not turn the cylinder further. Gun 2 was worse, it would seize up with just one or two shots fired. All primers were backing out. This is not an issue with the guns fowling all guns were clean, Gun 2 was squeaky clean when I tried the full case load for FF and seized up with one shot.
I also tried some smokeless to see if more pressure would solve the issue, guns were thoroughly cleaned. With 5.5 grains trail boss, using MO Bullets 200gr RNFP coated. Both guns exhibited the exact same issue.
What I have checked, primers seated completely from the remaining batch. I’m pretty sure they are, all are below flush. I loaded a few test rounds fresh and carefully seated the primers, I can feel them bottom out as always.
What I want to check is using different primers, I have Winchester LPP, CCI and Federal mag match yet to try.
I don’t think it is a light load, a full case of BP is not a light load in my book. Nor is 5.5 grains of Trail Boss, kind of standard stuff people shoot all the time in SASS.
Any ideas on what I should check, would the light crimp be an issue?