I shoot a lot of BPCS and have shot my Schuetzen rifle with Black Powder in certain matches. Compression is used by most competitors using a compression die before seating the bullet. Its a lot more compression than muzzleloaders.
Reason is it reduces fowling which is useful in matches, and some say improves consistency. It does increase pressure, not a problem in a rifle, most of us are using modern barrels able to stand much higher pressure than the Black Powder can produce. Not a good thing in a vintage shotgun
Shot shell I dump the charge in the case lightly press the over powder wad to settle the powder then shot/overshot/crimp. You need to press some, try dumping a charge, measure the depth then tap the side of the case with a brass rod. Powder dumped settles lot more than you would think when tapped. Compress lightly it settles it for you.
Boats
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