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Hi Kevin and welcome. Yes, you would need a G33 barrel or conversion barrel to shoot .357 Sig out of the G27: https://kkmprecision.com/product/27-match-357sig-2/ ------------ Cheers, stay safe and enjoy!

With a barrel swap it is possible to shoot 357 Sig from a Glock 27 https://www.opticsplanet.com/glock-barrel-g27-357-sig-3-5in.html

As soon as you swap out the barrel to shoot .357 sig, yes, you can.

you would need a different barrel and spring