I suspect you use a small ball for both, T.Caster, thick patch in the rifle and/or a very thin patch in the smoothbore with normal sized balls? Do you wipe often?
You guessed it. .600 rb w/.020 patch in rifle and .012 patch in smoothie. BoreButter type lube. I spitpatch wipe every 2nd or 3rd shot out of habit, wether it needs it or not. It's not something I worry about, I just do it, period. No biggie. I have never wanted to, or tried to shoot all day without wiping 'cause hard loading occurs and accuracy suffers when I do. I can give names of 3 other guys who use one ball for both barrels if you don't believe me.
I shoot my early .54 cal. Beck longrifle most the time anyway.
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I should know better than to make an absolute statement like that.
Someone ALWAYS refutes them. But I tend to shoot a .020+- patch in a .67 with a 662 ball. I am not a fan of tight fits but for *me* a 62 with a .600 is just too loose. But this is my preference.
But I have never owned a 62 so.....
I would have to at least try a larger ball just to see how it shot.
Dan