pete53 - I can't say for sure, but I bet the Labradar will read a .25 cal bullet just fine. It is the small-boattail .22 bullets, and smaller, like John mentioned, that it may have problems with. My unit reads my .223Rem V-Max bullets perfectly well.

The length of the bullet doesn't matter. It is the size of the flat portion of the bullet's base that matters. If that flat portion is too small, there is not enough surface area to reflect sufficient radar signal for the machine to receive and read. That is why some boattail .22 bullets can be difficult, but most any flat base .22 bullet works just fine.


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