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Jim Watson · January 11, 2019, 05:49 PM

If the OP really means the OQ
"with same 'powder' load, which bullet weight has more recoil? A lighter one or a heavier one? 115gr or 124 gr? 9mm?"

Then the heavier bullet will have the greatest recoil.
For many powders, a maximum load for a 147 is a starting load for a 124 and a powderpuff load for 115 grain bullet. Velocity is not much different so the heavier bullet will have the most momentum.

January 11, 2019, 05:49 PM	#15
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 18,539	If the OP really means the OQ "with same 'powder' load, which bullet weight has more recoil? A lighter one or a heavier one? 115gr or 124 gr? 9mm?" Then the heavier bullet will have the greatest recoil. For many powders, a maximum load for a 147 is a starting load for a 124 and a powderpuff load for 115 grain bullet. Velocity is not much different so the heavier bullet will have the most momentum.