[Brian Pfleuger]

I agree with SL1.

There are far more variables and it is far more complicated.

Anyways, a little story....

I was noticing a little slide peening on my G33 (357sig) and I know that it uses the same recoil spring as the 40SW, but produces considerably more energy.

So, I ordered a Wolf 21lb recoil spring and guide rod, which I expected to make a pretty significant change to recoil and the distance that the brass was ejected..... it did neither.

Then, I decided to try it with some really light loads, sub-9mm power levels. This spring is like 75%-100% over power for these loads. I figured, for sure, that the gun wouldn't even operate correctly..... wrong again. It works fine. In fact, I can't even tell the difference. The brass even lands in basically the same spot.

The ONLY thing I see different with this spring is that when I drop the slide it will sometimes jam the round against the feed ramp. Almost seems like it would be less likely to do that rather than more, doesn't it? It also destroys the round when it does that, crams the bullet right back into the case.

Recoil springs are not as simple as it would seem.