Originally Posted by
marlinman93
I own a Ballard with 3 Pope barrels, and one is .22WCF. My barrel isn't a good example being a custom Pope done around 1900 I'd guess. But it does have a fairly large groove of around .225" and a twist rate of 1:14". I had a mold built for it that's 50 grs. by Brooks, and it shoots extremely well with the .226" bullet.
If the Winchester is typical I've heard of some using bullets as large as .228", so you're going to have to get a mold and cast for it. Nobody sells bullets large enough for most .22WCF bores.