I have the two band navy and it doesnt like minnies at all, at least not the ones i have made from lead flashing and old water pipes. Have tried different lubes, powders and different weights between 50 and 80 grns but settled on 70 grns of ts2 with a round ball and patch soaked in wonderlube. Only shoot at 50 metres but this load groups nicely about 10" above point of aim. I also use the old film pots and they are brilliant. Just the right price!
The only problem i have now is because i shoot at 50m the sights are at there lowest setting, this means your cheek is right on the stock and after 50 shots it feels like youve been smacked one in a fight.