4 1/2" barrel would be minimal velocity loss. You normally lose about 30 to 35 FPS per inch so that small of a change would probably show a velocity loss around 50 fps.
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Gary how does the 401GNR compare in different barrel lengths
- Asa, 2019-10-25, 11:29
- Asa, taking the velocities of a 6 inch barrel and going to a - Gary Reeder, 2019-10-25, 12:23
- Mine is a 6" after I discovered most 5.5" holsters hold a 6" - WB, 2019-10-25, 12:19