Jack,
I might have missed this as am not understanding what projectile, you are going to shoot. Sound like you are going for a PRB. ...
If so and although not "perfect" your 1:48, should still serve you well.
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So for those relatively short range shots, is twist rate all that important?
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Absotively and twist is to conical as spin is to football. What happens when you put too much spin on a hardwall? That's right, instability, curve or slider. ...
Be Safe !!!