Hi Flash,
I have two Kirst Konverters. 45ACP and 45 LC. My ROA that I had cut down was new (no black powder in this gun)
Winchester white box....45 ACP 230 grain FMJ....Muzzle velocity 835 fps. At 12 yds good groups.
Winchester white box....45 LC 230 gr JHP......muzzle velocity 880 fps. At 12 yds the groups were tighter with the JHP
I know......The Ruger manual, the use of jacketed bullets is not recommended as accuracy is generally not as satisfactory.
Blazer ammo in 45 LC......200 grain JHP....muzzle vol 1000 fps. At 12yds groups were super great, tighter then the ACP cylinder.
With a 3 1/2'' barrel this ROA can shot jacketed bullets with good/great accuracy. (with a rest)
My ROA 7 1/2'' and my 5 1/2'' shooting jacketed out to 25 to 30 yds with a rest groups are great. The 7 1/2'' will out shot the 5 1/2'' big time.
Jacketed bullets are working for me, it may not work in your ROA.
Bob