I have the same problem with my 3913TSW. The cure was to load up 147 grain TMJ Speer bullets with 5.4 grains of Blue Dot. Instant center black at 25 yards on a standard 25 yard Bullseye target. I quit carrying factory 124 grain loads and now carry 147 grain jhp. This using factory 3-dot fixed sights.
Arman
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