Well I own them in both stainless steel and in the blued version. Actually in my personal opinion I like the looks of the stainless steel barrel. It reminds of the kit when I assembled it and before I browned the barrel of the original renegade it is on.
I was shooting the .45 caliber yesterday. Great shooting rifle. 85 grains of Goex 3f and a 180 grain Gold Dot and it was making a hole at 50 yards. Even the 200 grain Hornady XTP did real well. I do not know how hard I can push that bullet before it falls apart. I want to try some of the Lehigh bullets out of it.
I am not sure what the dimension of the bore is as I never slugged it. But the standard .45 caliber sabot and a 10mm bullet is a nice snug fitting load.
I have scopes mounted on the Stainless Steel models and no scopes on the blued models.
There is the .50 after a hard day on the range. They clean up like a dream by the way.