I have an M1898 cutdown that is very similar to a DCM Krag. (1899 carbine stock, 21" barrel, '03 front sight) It wears a S&K Instamount with a 2-7 Leupold. It always puts the first 2 shots within an inch of each other and right at the point of aim. Third shot walks a little, but the gun is over 100 years old.

Yes, I've hunted deer with it, but never got a shot while I was carrying it.