I agree with Ray.

Simply put in the time and practice and learn how to shoot iron sights.

At 25 yard you should be able to put ten out of ten into a 6" bull with no sight at all simply by pointing the rifle. I think your problem may well be a major flinch.

Excellent advise Ray. It is not uncommon for XC service rifle shooters to sight in their rifles off hand at both 100 and 200 yards. First stage is at 200 off hand, no sticks, no sling, and many put more than 9 out of 10 shots in a 10" circle at that distance and all done with "iron" sights. Not hard to sight in your rifle at 200 yards off hand with either irons or scope with practice.