Shot a few 10 shot groups @ 50 yards with my 5R Milspec. I wasn't sure how radiused rifling would handle cast boolits. I used the 165 grainer from Accurate Mold sized to .312" with 2400 and Winchester Large Pistol primers ...........looks like there's some promise here. Will increase powder in 1/2 grain increments and see what happens.
15 grains = .883"
16 grains = .892"
17 grains = .706"