I have a KKM .57 Sig barrel for my 35. Im using a Wolff 24 lb spring and Wolff gude rod. I've jammed a few rounds but I think it was my fault by limpwristing. Thats when I started shooting .357 Sig and was anticipating the recoil(which is not bad at all) The heavier springs also are less forgiving with a weak grip.
No problems since then and the shoots like a dream
I haven't changed anything except for the Wollf spring and guide rod.
[This message has been edited by grapeshad (edited February 17, 2000).]
While I have not converted my G35 - I do have a bastardized G22 frame / G31 slide with Bar-Sto 5.5" .357 Sig pistol. This pistol is one of the most accurate one I've ever owned! My gunsmith hard fitted the barrel - several 5 shot groups into less than 1.5" with CorBon's 125gr load.
I installed the Wolff guide rod and 24# recoil spring, like grapeshad did. Its functioned perfectly with full power loads. No other changes.