paulvallandigham
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I don't think you would cut your velocity, but the degree of accuracy shooting a PRB might be affected. You might have to use either a smaller powder charge, or be much more precise in how you throw that powder charge to get the same size groups at a given velocity.
I have a .50 cal. rifle that I ordered a GM barrel with a 1:72 ROT. I was delivered a barrel with a 1"48 ROT. The reason I wanted the slower ROT was so this thin, RB only barrel would be more forgiving of any measuring error I might make in the field, using a fixed powder measure. I have now tried both a fixed measure, and my adjustable measure, and have resigned myself to using my adjustable measure because I can throw more consistent powder charges with it than with my fixed measure. That has been the only downside of having what I consider the wrong ROT for this rifle.
I have a .50 cal. rifle that I ordered a GM barrel with a 1:72 ROT. I was delivered a barrel with a 1"48 ROT. The reason I wanted the slower ROT was so this thin, RB only barrel would be more forgiving of any measuring error I might make in the field, using a fixed powder measure. I have now tried both a fixed measure, and my adjustable measure, and have resigned myself to using my adjustable measure because I can throw more consistent powder charges with it than with my fixed measure. That has been the only downside of having what I consider the wrong ROT for this rifle.