Designing the 2-diameter paper patch bullet.

[J.B.]

You make it look easy Jim . I've got a ways to go with my experiments with dual diameter but it certainly appears to be the way around shooting pp in grease groove chambers if one wants to go easy on working the brass. I'm really keen to try my Brooks d/d in my 1/17" twist 44 but that will have to wait to later in the year as that rifle lies dormant in the U.S. until June . In my 1/19" it seems to do well to about 500 yds and then all bets are off. I gather this is the length vs twist issue so I'll shorten it up a little for my next test. One thing that I did find with patching is that a Ballard 45 template I had is almost perfect for the d/d 44 bullets. Ideally the length at the top of the patch needs to be reduced but the difference is minimal. As always... an interesting thread. Happy New Year to all.
rgds.. Gavin.
ps. perhaps I'll try patching on a the slightest angle and see if the problem is lessened.