What about behind a 308gas gun. My pof 308 with a break has almost no recoil
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Not based on felt recoil. Based on rearward acceleration. The ONLY way you can get away with putting one of these ITT's on anything other than intended is to find out what acceleration their limit is and then see if you can borrow an accelerometer from either a local college or university (physics dept. is a good place to start; they may even be interested in helping you for a class project).
Then attach the accelerometer on the weapon where it's sturdy. Use adapter mounts if need be. Fire and see if it is over what ITT specifies. If it's under, well, you're good to go. Be sure to try different rounds, a few of each.
The "5.56 only" pretty much covers the bulk of what it can be used on, but there are heavier weapons with heavy barrels that will have rear acceleration similar to or less than a 5.56 rifle.
But it has to be a good bit heavier than what an M4 would be. Maybe if you had an 18lb. rifle? I have one in 6.5G and wondered if it would take that, but no need for me to try. Still, you need to check it using that device. It's the only way to be sure.
There's another way of checking rear acceleration using a swing, but you need to know how to work the physics and math and run the experiments, and of course, you need a swing set or similar setup and makeshift platform to fire it from. Easy if you know the math, hard if you don't.
Best thing to do is to head mount that sucker and use a laser on the rifle. They work VERY well once you know how to use 'em right. I used 'em up to and past 300m with excellent precision on E and F types. If you don't like helmets, then Crye makes a soft head mount that is REALLY nice for about $100, plus a new shroud ($50?). Lasers go for a bit more, depending on what you want. I'd get a good, long range illuminator too. Hopefully one that won't drown out a .7mW laser.
Weapon mounted NODs are generally heavier duty and made for higher recoil. They usually mount in the front and are designed for use with day scopes. Costly for long range and bigger scopes, so start saving now. This is THE way to go though if you want a NV scope and day scope in one.
Good luck.