Uncle Richard
Member
Im testing out a load for 40sw and getting the same speeds (fps) for a lighter bullet with more powder than a heavier bullet with less powder. I would think the lighter bullet would be faster with more powder, but its not.
Usually shoot 180gr RN rainer with 5.2gr WSF, chroned ~980 fps.
Due to bullet availability, Im working on a new load for 135gr RN berry's with 6.4 gr WSF... I'm getting almost the same velocity as the 180gr (980 fps).
Why? I would think smaller bullet weight and more powder should mean more fps.
Please enlighten me what I'm missing.
PS...its not the chronograph.
Usually shoot 180gr RN rainer with 5.2gr WSF, chroned ~980 fps.
Due to bullet availability, Im working on a new load for 135gr RN berry's with 6.4 gr WSF... I'm getting almost the same velocity as the 180gr (980 fps).
Why? I would think smaller bullet weight and more powder should mean more fps.
Please enlighten me what I'm missing.
PS...its not the chronograph.
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