Same way that a #3 coilspring and a #3 longspring have totally different jawspreads, for that matter the jawspreads vary a lot in the same "size" trap from brand to brand. I've never understood why Duke 330s aren't square either. Seemed pointless and likely to prevent sales to anybody who used them in boxes or cubbies who already had other brands. Since they wouldn't be interchangeable. They do catch beaver just fine though.

I bought 6 doz 160 belisles Sure I caught tons of coon In them but I also had lots of problems with coon escaping and leaving coon parts behind. I got rid of them because of that. Wasn't fair to the animal.
I also had some Belisle 330s. I had more then a few live otter in those traps and a few beaver escaped leaving parts behind. I got rid of those traps as well. Personally I think those traps are way over powered. And those stamped out tin dogs are worthless.
A buddy gave me 10 160 Belisles. They were In really bad shape. Soaked them In vinegar and got them rust free. I took those junk dogs off and had a buddy lazer cut out some regular dogs. Then I took my torch and weakened the springs. Know I have a trap that I can set by hand.
The safeties are great but If you keep your hands out of the kill zone and on the springs safeties don't matter.
Killing the animal that gets In your trap Is the only thing that matters.

But use what ever trips your trigger.

They are a safer trap to be, because the safeties are right where you put them. One saved trip to the ER because the safety fell off a 330 and broke a bone in you hand in a lifetime, will more than pay the difference in price of a Belisle than any other trap.

Very little time on adjusting the triggers on new Belisles 330s.

I bought 6 doz 160 belisles Sure I caught tons of coon In them but I also had lots of problems with coon escaping and leaving coon parts behind. I got rid of them because of that. Wasn't fair to the animal.
I also had some Belisle 330s. I had more then a few live otter in those traps and a few beaver escaped leaving parts behind. I got rid of those traps as well.

That's not true.
It's very difficult to keep a coon from reaching In to get the bait. Even if you recess the trap back In the box. Coon are natural born to reach for food. Even If that coon would crawl Into the box It's still going to reach for that bait.
How many coon have you caught Boco? You ever have a live otter or beaver in a BG?

I don't b buy into that a Duke 330 will kill a beaver dead just like the expensive one will.

If you are using magnum traps stake them like you would if you expected a live beaver.