Srose

I tried the 4198 load yesterday with problems

The powder did not ignite properly, 2 rounds 3 inches up the barrells, 3rd went 20 yards, the 4th hit the target and chronoed 450 fps! Unburnt powder everywhere!

I used the above load with fibre wads, the bullet just touched them, no airspace.
I had similar problem with my snider, .600 Round ball, dacron filler, cookie plus milk carton wads, federal primers - ball 2 inches down bore, as above

I loaded a 12mm R/B remington with the same powder and primers the same day, perfect! The 12mm case is a little smaller but similar % of case filling

What am I doing wrong? Should I (did you) use magnum primers?, Or go back to pyrodex?

Any help would be appreciated

TH44