I a 20 gage sxs flint that I have taken many Toms with . She is real good out to about 30 yards with mixed 4 and 7s.
Read some of Greeners writings on how to work a load and build a pattern for cylinder bores . He has a whole section on the British public Trials and goes into some depth about the smaller bores out patterning the larger bores . Even discusses chokes vs. cylinder bore and how they compared both muzzleloader and cartridge . You will be surprised at just how well they will do .
That being said . My last smoothbore that I built was a Hudson valley but in a small 28 bore . I have taken 2 Tomes with it both were just alittle past 25 yards .
Im not real sure what the deal is with it . Maybe it’s the barrel length which comes in at 52 inchs . But using 71/2 , she will near cover a paper plate at 25 yards
load is 70 grains of 2f with 2 oz of 4s
this target is from the same gun shot at 45 yards with RB . then a load of shot just for the $#*! of it
this is a mix of 7 and 4 .
lilled alot of toms with 7s . but i also head hunt . if your taking body shots then i wouldnt go smaller then 4s