I have a TC express rifle. It has two sets of rear sights that you can sight for different distances. It has a pretty long barrel and as near as I can measure it has a 1 in 48 twist. I have shot one deer with it which dropped in its tracks. I was shooting 90 grains of Pyrodex Select and a 260 grain Speer 45 caliber hollow point pistol bullets. I have never seen another rifle like this one. Has anyone else had one of these or know anything about them? I have really never put it through its paces but plan to shoot it more this year. Thanks. It is a fifty caliber.