I don't load lead in my 9mm's any more......
however I do shoot some "Coated bullets" now and then.

With Alliant Bullseye powder I can get a 125gr coated .356 dia
from a low 938fps with a long OAL.

With a very short OAL Bullseye can get this bullet up to 1046fps
with a full load, per the companies load data.

As mentioned see if your barrel can shoot lead..........
I did not have to change recoil springs, my C9 factory 9mm worked fine.

Have fun.