I went to the range with the inverted T target to try a .050 aperture I just bought. I used tape to make the T that was 1&3/4
" wide and it is good, but 2 inches would be better. The sun was off and on and I had about 4 seconds before the sight would fuzz up on me. The first two were about a half inch left of where I wanted them on top of each other, and then the next four zig-zagged right and low. I forgot I only had 6 balls in my range box so I had to quit. I'd have swabbed the bore and done some more testing, otherwise. I'll have to get back at it in about a week. By then the sights I ordered for the 54 should be delivered and I'll get them on.