I have a need for a mounted laser for a .50 caliber bore, to be sighted in at 300 meters. Daylight visibility is not necessary but the laser will need to be visible when shaded from the sun with cardboard or something. This is for target alignment and not gun alignment. From what I remember when I was looking at this last year, most rifle lasers on the market have a significant dot size at 300m so the spot might be 6 in. in dia. Ideally it would be a laser that wasn't so powerful that its regulated out of the civilian market. If I can't find one I'm looking at making my own adjustable mount for one of these.

https://lasertoolsco.com/wp-content...10-Solar-Energy-Installation-System-Flyer.pdf

They claim its decently columnated. I'll also need a short range laser for 50m and an optical sight but I'm sure those will be easier to find.

Does anyone have suggestions on laser sights for large caliber guns? Thanks in advance.

link gives a 404

Probable (?) hot link ...

OCD requires me to post this - collimated not columnated.

So putting aside my grammar problems, does anyone have experience with long distance lasers? Refractive movement due to heat and cold?