You can't really know what any particular load & .45 or 9mm pistol are going to produce, velocity-wise, until you fire some random samples of any particular production lot.
Even then, that's only going to tell you about the consistency & observed standard deviation of the velocity ... from
that gun, using loads from those production lots.
None of which is going to tell you how the bullets fired from those production lots, from that gun, are going to "perform", expansion & penetration-wise.
We look for trends among the big name company products, compared against stated "performance specs", and hope for what the manufacturers tell us they observed in their in-house QC testing to occur with some consistency in real world conditions.
All of that said ...
Last time I volunteered the use of my CS45 (3.25" barrel) for some gel testing, using the Ranger SXT T-Series 230gr loads, in both standard and +P, the data I got back showed something like 802fps & 839fps on at least a couple recorded shots (fired into gel covered with 4 layers of new denim). They looked like this:
Of course, at the same time a Colt Commander was also used (4.25" barrel), and the recovered rounds looked like this:
Maybe the notching cuts on the one not-fully-expanded bullet were too shallow? Dull cutter? Just one of those things?
Then, some 147gr & 127gr +P+ SXT T-Series rounds were fired from a CS9 (3" barrel), and they did this:
What's it all mean? Dunno.
I've quit worrying about it, though. I use small 9's, .40's & .45's loaded with one or another of the newer designed hollowpoint loads made by one or another of the major American ammo companies (who have acquired experience making ammo used b y LE/Gov users) ... and I focus my attention on weapon maintenance, as well as my own skillset, training/practice regimen and maintaining my mindset.
Some days I may choose my CS45 (6rd mags), or my original 4513TSW (also 6-rd mags), or one of my single stack 9's or .40's with 7 or 8-rd mags ... or a double stack 9/.40 with 9/10-rd mags ... or even my full-size .40 with either 10/12-rd mags, or one of my single stack or double stack .45's (7, 8 or 10-rd mags). Just depends.
I've even got some various loads using different "premium" bullets designs, too. 9mm loads run from 115gr +P+, to 124gr +P, to 127gr +P+ and 147gr. I might have different loads in different 9's, depending on what box was at hand when I last loaded the guns.
My .45's run mostly 230gr, and of those it's mostly standard pressure ... but I do have some older and current production RA45TP (+P), and maybe even some RA45SXTP (+P) left over. Not much in the way of 185gr or 200gr +P left over, I'd think.
.40's? 165gr & 180gr loads, but a small amount of some 155gr loads (not my first or second choice).
Much of the time I'm carrying one of my 5-shot J-frames, though.
9mm versus .45 ACP?
Sure. Whichever. Suit yourself.
Got a special bullet design (make or manufacturer) you like? Great. Good for you.
How well can
you use
whatever you choose, under highly stressful & demanding conditions, though?
If
you can't "perform" under the worst of conditions, putting the fired rounds where they must go in order to obtain optimal effect in an intended threat target, are you relying on the difference in caliber and/or bullet design to somehow offset things?
I tend to put first things first, meaning the
owner/user/shooter part of everything.
Then the equipment, of which caliber and the specific ammunition are just a couple of considerations (and maybe not the most critical aspects, either).
As usual, just my own rambling thoughts.
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