I have discovered lately that I may need to try a larger aperature as I am having to squint too much to get the job done with the .040 I am now using. After a few shots I can't focus on anything-too much eye strain. For those of you who have been down this road, what size aperatures did you go to to eliminate eye strain and still maintain a decent score on the target? I shoot a RRA DCM. I have already ordered an .050 but haven't tried it yet. How large is too large? Thanks for your help.