It was, and it was dramatic. That would likely vary with the gun, length of barrel, and gun weight. I used a full sized CZ-75. 124 and 147 gr were very close in accuracy and consistency, but they both beat the pants off of 115.
Felt recoil also differed. For that gun, 147 gr has a very controlled, polished feel to it, and great consistency.
The ammo I used was Remington UMC FMJ.
I have also done A/B testing with different brands of the same weight, and out of 4 brands, the best seemed to be
Remington UMC
Freedom Munitions
followed closely by American Eagle (better than expected)
