Because this isn't using an image intensifier tube, as far as I know, there isn't really a "max limit" on caliber. Most analog NV has a limit of 556 (Night Optics did just drop a new scope that can handle 308). When looking at analog NV, the unit uses an image intensifier tube that is partly made of glass and is fairly fragile. This is all digital and much more akin to a hightech camera than an optical sighting system in basic design. The resolution on this isn't going to be that bad. It has a 1080p sensor and puts out a near 720p image (can't really use the 720p as the resolution as it has a different shape than an HD tv, but it is higher resolution than "standard def"). Amplification should be REALLY good for daytime use since this is meant to be used at night as well. In fact, I'm not sure what FL gun laws are but I'm going to have to look into whether this is legal to deer hunt with since you will be able to "amplify light" at dusk.