Would one for 9mm work on a 350 legend, 357 and 30-30 and how well

Depends on the manufacturer's ratings...

.357 is technically larger than a 9mm, not by much but I would verify before I purchased. The 3030 would be doable, but not sure how much suppression you would get with the size difference. Unless the 30 was loaded as a subsonic round, it would likely still be pretty loud. Same with the others really.

Jason

Darn , was thinking 9mm was bigger . I'll see about a 357 one then

9mm = .3543 inches

I'm guessing most 9mm cans have enough clearance for a .357, but I would check with the manufacturer first.

YHM R9 can handle a 30-30. A 30 cal can would do a better job, but it would be a lot better than nothing.

If you haven’t gotten the can yet, just get a .45 can.

I got a rugged obsidian that’s a .45 can but rated to 350 legend. Can hook it up to a 9mm with a new piston (costs like 80$)

It’s not the diameter you should be concerned about. You need to make sure the manufacturer rates the suppressor to handle the difference in pressures from the rifle calibers you’re wanting to use it on.

The plan was 9mm rifle , 357 rifle , 30-30 rifle