Thanks Rolinb,
To add to the conversation for newbies, or such, I had another gun, (also a T/C Pos) that I'd reamed out the touch hole liner and on loading loose powder and firing it went Pffft- small boom... I KNEW something was amiss.
That POS gun had a removable breech plug while it was still a flinter, and I took it apart, checked the bbl for obstruction and it was clear... Then standing in ankle deep snow I noticed where I'd loaded the last shot and rammed home the patched ball there was a goodly bit of loose powder lying on top of the snow...
Mystery solved: when I dumped in the main charge and started to ram home the greased patched ball the ball exerted enough pressure on air in the tube (bbl) to push out a goodly amount of the powder onto the snow...w/o snow, I'd never have known, so while it fired, it was a super light charge and fortunately it cleared the bbl...
Now, with the GPR and ANTE chamber of smaller diameter I may still have had an issue as the ball may not have been sitting on the powder and left an air gap... luckily the T/C Firestorm POS with removable breech plug wasn't built with an ante chamber so it didn't turn into a bomb but it sure made me hinky from there on... At that point, I used the feather quill in the touch hole to both load and transport if main charge was in the gun...
Thanks for clarifying rolin b and one can never be too cautious when handling firearms--- they are perfectly safe when all procedures are followed to a "T" but get sloppy nd they can and will bite the hand that feeds them...