The sg 553 lb and the Sg 551 sb have very similar barrel lengths and ought to have very similar velocities. The 553 lb has a rear sight drum with a v notch a 100m aperture a 200m aperture and 3000m aperture. The 551 sb has v 200, 300 and 400 meter apertures.
I don’t have much use for the 100 m setting as I find a 200 m zero good enough for muzzle to 250m or so.
My question is would the 551 sb drum work on the 553 lb? Or would the shorter sight radius of the 553 introduce too much error in the calibration throwing things off? Which way would it be off? How much?
Thanks in advance
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