777's real problems start when you light it off with regular shotgun or rifle or pistol primers. That "Hard Ring" only occurs when the ignition source is too hot. I use it all the time with percussion caps, and musket caps and no ring. But my Contender 50 mag barrel with 209 primers formed a hard ring in about 3 shots that was hard enough to fool me into believing that I had the bullet seated tight against the powder. Luckily I double checked with my ramrod mark and saw that the bullet was almost a full inch ABOVE the charge. BTW there are now special "low temp" 209 primers available that are supposed to fix the problem.
But I'll agree that good ol' Charcoal is the most fun, especially when shooting the old C&B revolvers. I always use Crisco to seal the chambers, and cornmeal for a filler sometimes, and it smells like Grandma's kitchen on the range, well.....ok.....maybe grandmas kitchen when the wind kicks up from behind the privvy...............=P
my 2¢
DG