doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Annealing brass

Stan, Good to hear your progress. I may have some .430 circle fly overshot cards; I'll look this a.m. Don't have wads, though other than plastic. Brass will always have more capacity than plastic as a crimp isn't necessary. I use the RMC recommendation of Duco Cement around the edges of the OSC once it is in place. Over the course of a turkey season, I've not had a problem with the osc card once glued in place. Gil
PS: I use their brass as well as their quality loading kit. Here are the instructions:
https://www.rockymountaincartridge.com/inventory_htm_files/RMC%20Load%20Kit%20Inst.pdf

Thanks, Gil.

There is also more capacity due to the inside of the case being larger diameter because the brass wall thickness is so much less than plastic. I tried a Rem .410 plastic shotcup in the case and it will drop to the bottom without any contact on the inside "walls". If I were to try using them I would have to use a card wad over powder to prevent migration around the shotcup. I assume the base of the plastic shotcup would expand to seal the gases behind it, as it does when fired in Chambermates and a larger bore gun, but it would take patterning and playing around with that to tweak the load, I would expect.

Good, clear instructions from RMC, thanks for the link.

One thing you can try with plastic wads to expand the gas seal is to mash and twist the seal against a round metal object. I do this with TPS wads in turkey loads shooting TSS. I've also wrapped Teflon plumbers tape around seal, tucking overage into cup. Another method is to peel apart an OSC to about half thickness or less and place it directly on the powder and seat the wad on top. With fiber wads, no need to split. With plastic wads I want the powder to push the osc into the bottom of the gas seal's dome shape. I store extra shells mouth up and don't leave them in the truck in which road vibration can contribute to powder migration if shell isn't upright, head down. My powders are fine ball powder in .410 and more prone to migrate than flake. I've not had a blooper but others have with other gauges, ball powder and certain plastic wads from BP in plastic hulls. Clear plastic wads by FIocchi allows observation of possible migration past the seal in 12 ga. Gil

Pressure Testing brass shotshells: I discussed this with the owner of Big Bore Ballistics. He has to use a special drill technique near the head of the shell to drill a hole into the brass in order to drive a piston in his pressure testing apparatus. Not so with plastic hulls. Tom Armbrust refers TSS testing to him. Precision won't test brass shells. Just a heads up if you should want to test once you establish satisfactory velocity. Gil

Stan,
Great news that you figured out the key to fire forming the cases. I knew you could do it when I saw you wouldn't give up. I'm sure now that you will also find a shot load that will satisfy you as well.
Mike