I don’t know anything about Monstrum, but you may want to look around here. Haven’t heard anything bad about them; in fact they seem well recommended.
I’ve had great luck with more basic Leupold scopes. They have some hunting scopes with finger adjustable turrets that cost far less than anything in the high end tactical line. You lose lighted reticles, but for a honest shooting at the range that’s no big deal.
I also have a Nikon fixed scope that is the brightest scope I own and bought used for almost nothing.