Not too sure about what range is usable.....especially for rimmy.....i've only used mine out to 35yd max(12ftlb)...thats all i've ever needed as i could easily get to that range(and much closer) with the bunnies....actually managed to get within 15yds once without ém getting too spooked.....i use the soviet Bazaar HTH pro IR laser,not too sure of its max usable range,but its way past 70yds.........in fact way too good for my gen1 stuff