Well keeping the barrel cool and blowing between shots to keep the BP fouling soft has a great effect on accuracy. I am shooting a 3 groove BACO FB boolit 20:1 alloy with no grease cookie. Rifle slugs at 457 and the boolit is 459. With open iron sights I can now hold to about 4 inch group size. This is as good as I can see. I plan to fit a set of aperture/ globe sights and will see what I can do out to 300 yards.
By the way this is with a full 75 gr FFg load, compressed with compression die
So far I think I'll persevere with BP but have been reading reports on 5744 with interest.
Mc