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Old September 22, 2012, 11:26 AM   #4
mete
Senior Member
 
Join Date: June 14, 2004
Location: NY State
Posts: 5,481
It does nothing with target loads .Try to understand the physics of it.

It does help with full loads .Putting the porting at and above the center line of the bore helps reduce muzzle rise which can reduce felt recoil.

40% seems way high , 25% is more likely .I wonder how they arrived at 40% ?
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