I bought six mb 450s to use as mixed species fox and coyote traps this fall, I will try half of them with shock springs to see if it makes any difference as far as foot damage. Will coyotes destroy the fox shock springs? Should I use a bigger size?

... live market I’m guessing? ... if not don’t waste your money

No sir, I'm trapping small farms close to residential areas and I dont want damage to my catch or incedental domestics

You’ll be fine with stock 450’s provided you’re on a 24hr check.

If not live marketing dont need em, imo. I bought 2 dozen shock springs years ago and I believe they do help, I still have em on some 450s and 550s, but its more to bury when bedding. I wasnt sold on em enough to put them on all the traps. On the domestics, set as far away from houses as you can

agreed

Im in the process of removing shock springs from all my footholds. Had them on all traps for live market coyote and fox over the past 3 decades. Dont do live market any longer. Will have about 20 dozen for sale soon. Both JC Connor and PIT.

You’ll be fine without them. I ran shock springs on about a quarter of my 450s. I think they help, but on a 24 hour check they certainly aren’t necessary.

I don't see what possible disadvantage the fox-type shock springs could have. I like 'em.

Better than no stop shock

My understanding was shock springs were more of a live market thing to prevent shoulder injury.

I assume that after a few hours In a trap most critters just lay down and pretty much give It up. Unless of coarse if they are getting harassed then they will be up and fighting the trap. I see no reason to use a shock spring.

Most do, some don't, I think it's for the first few hard lunges

I don't know. I had a red fox on camera for hours. He never stopped fighting that I could see. The camera would take video like every five minutes.