What's up guys i'm trying to convert my G22 from a 40. to a 357 i got the  barrel but a friend of mine said to purchase a seperate spring and wolff springs where good but i would like to know what number to go with so i could have it working good.

The Glock factory specs are the same, as far as recoil springs, for both calibers.  I'll never own a .40 or .357Sig Glock, but if I did, I'd go with 20-22# springs.  

WalterGA
for what reason if you don't mind me asking.

I don't like the .40's primarily because I only shoot my reloads.  I'm aware that lots of folks reload for Glock .40's, but I just don't think there's a lot of margin for error in the .40's design.  I get everything I need from .45ACP, 9mm, and the conversions such as .40 Super and .400 Cor-Bon that I get with my G21's and G30.

Similar reasons for not liking the .357 Sig.  I have loaded a bunch of bottleneck handgun ammo.  Primary problem I see is with the paucity of neck surface bearing area.  The more people reload .357 Sig, the more you're going to be hearing of setback-induced KB's.  

thnx for the feedback