The most common problem newbies have with a flinter is the lag between trigger break, flash and BOOM. I've even seen a rifle removed from his shoulder before the thing went off. Can you say "recoil pain," boys and girls?
Another very common trait is for the shooter to raise his head to look over the flash.
You are on the right path. Keep up the work. Have a buddy load for you and ocassionally slip you a bare pan or empty bbl.
Pops