A .22 rifle can generate equal to greater muzzle energy greater than .38 snub nose. And I can empty a magazine on target a lot quicker.
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I don't think it's caused by the rifling because the problem you described seems to be just vertical. I have been working with the same problem on my Marlin 1894 for a long time. Finally found that is was the guns balance and where the front sand bag is located. Brought the stringing down...
Looks like remington. That's a good deal.
Remington Bullets 38 Super (355 Diameter) 130 Grain Full Metal Jacket
Product #: 671905
Remington #: 22849 (100)