|Projectile|| Group Diameter
|60||.50 Cal Round Ball||4"||+2"|
|100||345 Grain Minie||2.5"||-8"|
|100||295 Grain Powerbelt||2"||-5"|
|90||245 Grain Powerbelt||2"||0|
To provide a bit more info, I used pre-lubed Traditions patches. Unlike the Powerbelts I really had to push to ram the balls down to the powder. Conversely, unlike the Powerbelts I didn't get a buildup of residue in the barrel just forward of where the bullet seats against the powder. The literature that comes with Powerbelt bullets it warns of this condition.
I was actually very impressed with how well the Vortek shot the patched round ball. Modern muzzleloaders generally have a fairly fast twist (1:28" in the case of my Traditions Vortek). The faster twist stablilizes bullets nicely but aren't so good with patched round lead balls. In comparison Mrs. Bugbear's father owns a Pedersoli Country hunter with a much slower twist (1:48") which shoots round balls very accurately but can't get much accuracy out of a Minie, Maxie or sabots. I've ordered some new sabots and I'm going to take them out to the range once they arrive. Expect another range report then.