Lyman GPR Flintlock. 32 inch barrel 1-60" twist.
Primed with FFFFg powder - about six grains.
.490 cal Lead round ball (177 grains)
0.010 lubed patch.
90 grains of FFg Goex
0.030 Walters Wad over the powder.
Muzzle Velocity = nominal 1900 fps.
Accuracy - three consecutive shots at 100 yards, benched: