I went to range with two types of ammo.
I had Federal HST 124 gr (100 rounds) and same number of HST 147gr.
I shot them with three different guns. CZ 75B, PCR and HK P30sk.
Shooting went well with no malfunctions of any type.
I was just surprised how better I was with 124gr. Not by little, but by much.
I also enjoyed shooting 124gr much better than 147 gr.
Probably it's all individual, but for me, from now on, it will be all the way 124gr. Especially given that ballistic results between the two are showing very small difference.