Ok, thanks I've been on the putter for a couple hours and found most of the information I needed. I still have one question, are the primer carriers a one time use or can they be used for multiple shots.
They can be used for several shots, H&R claimed 20 shots. I have gotten more shots out of one I tested, but you will have serious blowback from the very first shot. You will get some serious wash out of the plastic after just a couple shots, and gets worse each additional shot. The primer carriers leak pressure like a seive, and will not ignite Blackhorn 209 powder reliably, if you intend to use that?
The .25 ACP ignition works well on easy to ignite powders, but not reliable on Blackhorn 209 in my testing. I have custom made plugs for shooting BH209 that don't require the primer carriers.