Semi - I went with the 1:28. I thought the 1:24 might be too fast for the bullets I was planning on using and this twist worked good for me in my GM barrels. One thing that is nice about this barrel sleeve is that I sent hm the bullets I was going to be using and he sized the bore to that particular combo. Use the short starter to start the bullet and once the rifling bit into the sabot, it went down with just a nice smooth push.
And a bit ago I was out in the yard and the neighbor said he saw me pulling up after I was done shooting. He told me he has a muzzleloader, he thinks its a Hawken but he's not sure. He has never fired it. And - he told me it has a long brass scope that goes on it!!!!!!!! I told him I liked MLs and he said he would bring it out for me to look at when he can 'dig it out'. Maybe I have found a little treasure.