I think the shallow rifling really is most advantageous in the very small calibers. I have always been able to obtain excellent hunting accuracy in any of my rifles with a very easy loading patch/ball combination. I have no use for a round ball rifle that has to be cleaned between shots.

I usually shoot balls .010" under bore with blue mattress tick I buy at Walmart. All my rifles use it, and they LIKE it - if you know what I mean.