No matter how much it costs any filter will cut your range down !
Best bet, buy a lamp with a red LED ! I got one as a complete kit for sub £25 and it walks all over my LED lenser and genuine ultra-fire with filters, it just such a pure red light. If you want the link PM me and I will send it to you. I was very impressed, there's just no need to spend big bucks and this would cover you for rim-fire ranges to 100/120 yards !
ATB
Matt
Could you post the link please? Thanks