Paul,
I've been shooting RMC brass hulls out of a .410 since 2016 and I've never had an issue with bloopers gluing the osc with Duco cement. I don't know the length of the brass hulls you are using, but mine are 3" which is overkill as the shot column extends only 2.75" more or less. I'm not using lead but TSS up to 7/8 oz. I wouldn't recommend crimping the brass without a little more research as to what pressures you'd generate. I know there are some loads out of brass hulls that "crimp" brass and there was someone selling the tools to do so at one time on the forum classified section. There are some 3/4 oz. lead loads using the Stump wad in 3" shells listed in the BP Advantages manual using Lil Gun and a fold crimp. I wouldn't hesitate loading this load in my brass and using Duco (as recommended by RMC) to secure the osc. Gil
