Simmons .22 mag scope mounts - Simmons Aluminum Rifle Scope Ring

I Bought a Simmons .22 mag. scope, it came with scope mounts. I tried mounting it on a .22 mag marlin. they seemed tight, but don't tighten all the way, and keep slipping forward when shooting. they are a fraction too big. So ive tried them on a win. .22 LR, a .22 semi marlin and a, old Savage- Stevens .22 single shot. they are from an eigth to 1/4 inch short. of tightening up. I had to buy. a 60 dollar Burris scope mounts, to mount my Simmons scope. So the free mounts with a Simmons scope casts me about 60 dollars and 2 boxes of shells, trying to correct. I don't recommend these mounts to anyone