From what I understand about bullet stability, bullet length is the limiting factor for twist rates. So a bullet that is full bore and relatively light should shoot just fine out of it. Plus look at what @Idaholewis has shown with a 1:48 twist Hawken/Renegade
I shoot 195 & 200 out of my 1:30, .45
My elite shoots better than I can that is for sure, never tried a heavier bullet personally. Often folks use long bullets that don't stabilize as well without really pushing them
The bolt looks like a mountaineer,
The barrel fluting looks like a mountaineer, and master hunter disc extreme,
It may be a parts gun, or may be a mountaineer wrongly advertised?