On the 600/660's the mounting holes, frame width etc are the same but the trigger shoe is more forward,My son has a Model 7 and He put a standard Timney 700 trigger on it.
I was always under the impression that the model 7, 700 long, 700 short, 600, 660, 40x 721, 722 and do on so could use the basic model 700 trigger.
Try a JardShilon got back to me.
There trigger doesnt fit the model seven.
Figured id pass that along for anyone following along.
Im not impressed with Timney triggers. I will not purchase another. Or a rifle Basics