Grains

So, I got my 9mm back.  New mag springs to break in, fun to be had, let's see if I can replicate my .22 success with a centerfire pistol.

I am new the 9mm.  With .45 it's just, really, one size of projectile, 230 grain.  Sure there are 185s out there, but that is few and far between.  With 9mm there is 115 grain, 124 grain, 147 grain...

Like I said, I am new to 9mm.  Is there any noticeable difference in recoil and pistol control?  I am figuring I will get adequate penetration from a faster 115 as well as a heavier 147, but...  my initial impression is I can't tell the difference, on my end.

I remember shooting a 185 grain semi-wadcutter .45 and I could DEFINITELY notice it was easier to manage.  If you put one of those in a magazine of 230 grains cartridges I could tell you which one was 185.

I haven't attempted that with the 9mm, putting a 115 in a mag of 147.  Like I said, I don't think I should bother.

I also haven't noticed shot groups shifting anywhere dependent on projectile weight, but, with my groups who would notice...

Am I missing something here or need to do more testing?  What say you? Is your experience different? 

Instinct says to split the difference, get noting but 124 grain, 1000 FMJs, and a buncha Federal HST to test and load as defense rounds and make it the house gun when the reliability is hammered down.