I run this load in my guns with bone stock 16# springs which are the standard weight for a 1911. If I was intending to shoot a bunch of them, an 18# would not hurt.. That said, the ammo I produce is designed to run in unmodified guns that are properly maintained (springs replaced as needed).
I have some personal ammo that I have made that is very warm, that I use in modified guns, but that is a whole other topic. You can push the envelope both in .45 caliber and 10mm with sensible modifications. With 1911s, doing things such as using flat bottom firing pin stops and heavier firing pin springs and recoil springs will allow you to bump up the velocity into the .45 Super range. Same with the Glock 20/21 platform. Heavier springs in the magazines and recoil springs will allow you to push heavy bullets a lot faster than most might think. That said, there comes a point of diminishing returns in terms of recoil control.
The 250 at 950 is a very nice shooting load that approximates the old .45 Colt and will shoot clean through a Mule Deer, yet is quite manageable in terms of shooting quickly for an experienced shooter. It is in my opinion the "Goldilocks" kind of sweet spot, when it comes to speed, power and controllability.