Actually they still make it as the Model Seven is nearly a clone of the 660 with a nicer looking bolt handle and NONE-PLASTIC floor plate. The Model 7 is everything the 600/660 should have been in the first place.
I don't think the trigger had much to do with them stopping production as they fixed all the ones that they had a problem with if you brought it in. At that time short barrel bolt-actions were not selling very well.
My 600 had a great trigger, the replacement one is even better. I bought mine in 1966, I had never seen one before and said I'd take the first bolt-action rifle the Embassy Gun Shop in Taipei could get in 223. OMG it was the ugliest rifle I'd ever seen, first stop with it was to the AF armorer to have the rib removed and reshape the square forend. It served me well for 30 years firing untold numbers of 223 as I could get all I wanted in the service and after that a very nice sheriff would donate ammo cans full to sate my addiction to shooting, still have it only now it wears a 6x45 barrel.
I'm pretty sure that Coast to Coast in Detroit Lakes MN carried 600 Mohawks as I thought about getting one for my Ex but she wanted a 760 Pump to go with her Wingmaster.