I've heard some good reviews on the scopecoat covers and would like to get one for my Nightforce NXS 56mm scope. I can't figure out which size though. The scope measures about 18-1/4" long with sunshade attached, and the measuring instructions from scopecoat say to get one 1 to 1-1/2" shorter than the actual scope. Well they have a special Nightforce scope cover that's 19-1/2" which some people say fits their NF scope perfectly. I emailed scopecoat and they recommended the XL cover which is only 15-1/2", seemingly too small. Now I notice they have a 2XL version which is 17-1/2". Those of you who are using this product on a big scope which size did you get and how well does it fit? Input much appreciated!