T/C Omega rifles seem to vary in barrel tightness and amount of fouling with powder especially Triple Seven. Lots of people use Triple Seven with no problem. I cannot shoot the stuff in my .50cal Stainless Omega without a hard fouling ring forming just forward of the powder charge (the infamous "crud ring"). I have tried all the fixes. No lube, clean barrel with alcohol, smooth barrel with 200 passes JB bore paste, .25ACP primer conversion, Use Powerbelts instead of sabot/bullet combinations, loose Tripple Seven, Tripple Seven pellets, all three style breechplugs from T/C, bore butter in the base of the Powerbelt, CCI 209 primers, Winchester 209 primers, Remington 209 primers, and some I probably forgot. The only improvement worth mentioning is the .25ACP conversion using Winchester standard rifle primers. It gets rid of about 80% of the problem in my rifle but I still cannot load a second shot without a couple of swabs between (one wet and one dry with patch switched for both sides on both patches - thats four passes with the ramrod). I finally ordered four pounds of Black Mag'3 and it is a 100% fix. I can load multiple shots without a swab between with either Powerbelts or bullets with Harvester sabots. The powder is presently expensive but actually cheap considering what I spent to not fix the problem. A plus is that the powder is non-corrosive to steel which really helps to set my mind at ease when I am in the field and cannot get to boiling water. A couple of patches and a little oil and my expensive rifle is good to go for several days before I have to really clean it. Hornady 300gr. SST bullets in Harvester sabots group real good in my rifle with 90-100gr. of BM3 at 1920fps(100gr.) with the .25ACP primer or just over 2000fps with the 209 primer. I dropped back to 90gr. for my elk hunt this year and shot completely through the chest cavity with the 300gr. SST.