HI; 115- more flash and blast, higher velocity.
124- less blast, still good accuracy, pleasant to shoot.
147- faster recovery time while still making power factor for IPSC shooting
124 for shooting for fun and reloading,
I got my sun glasses on so fire away!
Right on.
I wanted to verify that, so I took my neighbor to the range.
He had never holded a pistol in his hands.
I loaded 3 mags (each marked) with 115, 124 and 147's.
I mixed the mags, marks down and handle them to him random.
I put aside each empty mag, marks down.
When finished, I asked him which was the more comfortable for him to shoot.
He said they are exactly placed that way on the table.
I turned the mags and, out of luck, they were 115, 124 and 147.
I agree with what VICIOUS said; 147 for fast recovery and less recoil, but, pricewise, I'll buy 124's.