The Winchester 125 Silvertip +P is really only a topend 9mm...velocity is only in the 1200s...
If you want your Commander to be the best that it can be then try any of the following:
CorBon 115....Uses a Sierra bullet at 1450+ fps...I have had some boxes that chronograph 1494 average. If you believe in expansion this is the round...
CorBon 124...uses a Hornady XTP at 1350+ fps. Pushed at this velocity the XTP both expands like no 9mm and penetrates better than the 115.
CorBon PowR'Ball....a 100 grain capped bullet that doesn't come apart and doesn't depend on a fluid filled cavity for expansion. Velocity out of a Commander is 1500+ fps...
CorBon DPX...uses the 125 Barnes all copper HP at 1350 fps...it turns inside out but the copper base holds everything together.
I tested several of the above in these tests...
...a few bullets tests... - 24hourcampfire
Buffalo Bore also now has a line of .38 Super....
Handgun Planet: "Super" Super: Buffalo Bore 38 Super +P Ammo
From the late great Stephen Camp....
Corbon
How Does
.38 Super Homepage...
38 Super
If you are going to run topend loads in your Commander, and I have several aluminum frame Commanders that have well over 5K rounds of 1300 fps+ ammo through them, use a 18-20# recoil spring. I have also always used a now discontinued Kings Recoil Buffer. It looks like a regular recoil spring guide but has a spring loaded tip that slows the slide down the last 3/8" of travel...
You can also add barrels in 9mm and 9x23 with minimal modifications to the gun...
Checkout MidwayUSA...they have some of the ammo in stock and a lot of rounds from different makers...Buffalo Bore, DoubleTap...and more...
I've carried a .38 Super Commander every day for 34 years... Daily carry ammo has been the PowR'Ball.
Hope this helps...Bob