Gary Mitchell shot "Ole Blue" for years, with .050 HS or so I'm told. Most of mine shot quite well at .046 -.048. When I rebarreled, I had the smith set that HS at .044 and never looked back. I've a fellow shooter that had his new barrel set at .042, and had nothing but trouble with hang fires and problems ejecting. I'd just shoot it as is until you decide to rebarrel. I tried the shims, and that's how I found that HS that is to little will cause problems. Main thing you want, is clearance of at least .002 - .003, between the breech and the nose of the bolt. Keep the extractors clean and never oil the interior of the bolt of trigger,