Checkman
Sometimes the reasons we're given for sudden Policy changes seems only remotely connected to the situation being "resolved" by the Policy changes, if at all, don't they? Oh well, they don't have to explain why, when it comes right down to it, do they?
I take it that you're not part of your Firearms Training Unit? Of course, even if you were, that wouldn't necessarily mean that you'd always have any direct input into things affecting the firearms training and the firearms & ammunition procurement process ...
We're also testing SIG pistols in .40 S&W and .45 ACP, and so far they seem to have gotten some good responses. It was interesting to note that two of our instructors experienced a failure to feed in each pistol, within the first couple of magazines, when we initially started shooting them. They decided it was a case of new pistols being broken in. By the time I had a chance to shoot them, they were doing fine.
Considering the barrels on your pending new G36's are less than an inch shorter than the G21's barrels, that's not as drastic as difference as it might be in other situations. Your P245 only has a barrel length of 3.9", which is only 0.12" longer than the G36's barrel. I wouldn't worry about it overly much.
Are you using the 230gr Hydra-Shok in your SIG's now, or something else you provide for your own pistols? Are you using the older Hydra-Shok, or the newer HST, by the way? The newer HST seems like it performs very well from what little testing I've seen done with it.
Maybe you could get your firearms unit to invite a couple of the major ammunition manufacturers to give an on-site gelatin testing. Or, maybe you could find if they're coming to somewhere nearby in your part of the state. That's an informal, non-threatening way to take someone from your agency to a friendly 2-4 hour gathering of folks from agencies in your area, and test some of your present ammunition against what other folks are using, as well as what the particular manufacturer is providing. It's only a form of advertising, when it comes right down to it ... they're only going to be firing 1-2 rounds in each test, but sometimes they'll set up anywhere from 2-5 different types of barrier tests ... but it's also an enjoyable way to spend a couple hours. One of the vendors in our area that hosts these events for their primary manufacturer's line always brings barbeque equipment and provides free lunch.
One thing I'd mention about the 185gr SilverTip for L/E use, though, is that even the Winchester L/E reps don't often recommend it for common L/E use. When I asked why one time, I was told that it simply didn't offer the level of penetration that most ballistics testing protocols seemed to indicate was "adequate", or at least considered "acceptable", penetration for L/E service ammunition. In other words, it expanded very quickly, but rather shallowly. Sure enough, when the Winchester rep brought out a box to test, to show his point (since it apparently wasn't on the testing schedule for that afternoon), the rounds didn't reach much more than 7-8" when fired into the denim covered gelatin. Expanded well, though.
There are other 185gr +P loads offered for L/E use, if that's what interests you.
I presently carry either Winchester 230gr RA45T or Speer 230gr Gold Dot in my shorter barreled .45's, which have barrels of 3.25", 3.5" & 3.75". The standard velocity Ranger RA45T actually showed a velocity of 802fps when fired through my 3.25" barrel one time, and went 13" into the 4-layer denim covered gelatin, and expanded to .76". The +P SXT only managed 839fps, went 12" deep and expanded to .77". The standard velocity round is more controllable in the little gun, and is really why I carry it instead of the +P round. Of course, that was only for one test, on one day, involving 1 round of each load ... so it doesn't "prove" anything.
Also, further testing by Dr Gary Roberts has shown that apparently depending on the sharpness of the broach cutting equipment used in the production of the Ranger T-Series bullets, if the jacket cuts are made by dulling cutters, then the expansion of the bullets might be adversely affected at the lower velocities of the standard pressure rounds. We came across an example of that during our gelatin testing one time when using both my CS45 and another instructor's Commander (4.25" barrel). The standard pressure 230gr load unevenly expanded when fired through the Commander, while the +P round expanded uniformly ... that day.
It's always something ...
I may be sharing your sentiments in the near future, as I have no idea what weapon system we'll be adopting to replace our aging inventory, the majority of which is approaching 15 years old.
Best of luck. Just remember, they're only handguns ...
Here's a picture of the standard pressure Ranger (left) and the +P version (right) fired through my 3.25" barreled CS45 that day.