Once again, I would like to second Daryl's sage words about Pyrodex. I have no experience with Triple 7 but certainly accept his (now live in the land of available BP!). For many years I had nothing but Pyrodex to shoot in my MLs in humid Hawaii. It is disastrously hygroscopic. If you spilled a few grains on the bench you could just watch it accumulate its own little surrounding of distinct moisture, til it seemed to melt. Done shooting, you had to clean very thoroughly, then clean again in a few days. The residue would remain in any fine cracks or corrosion of the gun, and "fester" Ordinary high quality gun oils to no avail. BP is like a godsend by comparison, and here in dry Arizona it has little corrosion tendency.

Daryl is also quite right about TrailBoss being a high pressure powder, in keeping with its "fast" makeup. Scary thought when somebody thinks it is simply like BP and a caseful in their favorite round should be no problem. Yet it is highly interesting that it works well as a BP substitute in some rifle cartridges, just as the also relatively fast 4198 does. But in the proper dose only!

Daryl, I'm a newbie and don't know if it 's already been done, but it seems to me that a separate thread to document and discuss the usages (and caveats) of TrailBoss would well be in order. Many more NitroExpress members or browsers would see it, and it would have considerable worth. If this is feasible, could I prevail on you to start one and reiterate plus build on your comments?

Aloha, Ka'imiloa