I shoot no more than 300 rounds a month anymore of center fire, mixed lately between .38 and 9x18 Mak and 9x19. I haven't fired my .45 ACP in a while, need to change the press out for .45s and run a few off. I've been loading 9x18 lately and a lot of .38. It is impossible for me to give you a break down caliber by caliber of rounds fired. I just shoot what I feel like that day, don't really worry about round count. I used to shoot a LOT of 9x19, when I was semi-serious about shooting IDPA. I even got a Dillon progressive for set up specifically for the caliber. I'd put a couple hundred rounds a week down range, usually 50 from my Kel Tec and the rest from my Ruger P95, later a P85. I ran up a pretty gun round count on that P11 Kel Tec in 4 years of shootiing mostly 9. I estimate that little gun has around or over 11K rounds though it. I'm easy on it now days, shoot it occasionally since I carry it. I shot it last week.
I always shoot 50-100 rounds of .22LR every trip and I've been taking my cap and ball out a lot. Those get no more'n 50 rounds a trip. Slow to reload. I haven't shot .45 Colt in a while and all my brass is loaded up, I think. I've been slackin' on my .45s except for the Ruger Old Army, that's a .45.
When I go to the range, I just shoot what I'm into that day. Lately, I got a new 9x18 Polish P64 so that's been getting a lot of fire, and I've been buying a lot of Monarch ammo for it at Academy, cheap and available. I never tire of the .38s, though, Taurus 85UL 2", Rossi 68 3", Smith and Wesson M10 4" HB, two Taurus M66 .357s and a Ruger Blackhawk in .357. I've got plenty of guns that take .38. My two 66s get shot a lot and occasionally I break out the M10. But, I usually shoot the Blackhawk at 50 and 100 yards off field rest, shooting stix, with .357 magnum for practice. It's a hunting revolver. I haven't done that in a while, though.
Almost all my shooting with centerfires is done with cast bullet reloads. I cast my own. The 9x18 does get a lot of ball, though.