Had a strange issue with my DNT the other day.
I've had it on my 308 for about 100 rounds then I moved it to my 300winmag, which was it's intended home from the beginning.
Mounted it up in an ADM mount and bore sighted it. Same mount used on the 308. First shot, windage almost dead nut, elavation 2.5 moa low. Okay, not bad. Dialed elavation, sent another one, .5 moa higher and left of my first shot. Clean cold gun, alright, send one more to make sure it's settled down, almost same hole.
Okay we're good to go.
Still 2 moa low, dial up 2, pull the trigger, 2 moa high. Huh ? Send another one. Right beside it. Wtf?
Down 2 moa, send one more, 2 moa low. Okay dial 1 moa up, send another, bullseye. I was getting exactly double what I was dialing, but only with the elavation. Windage was good.
Ran out of ammo and daylight so I packed everything up to head in and that's when I noticed my can was barely tight. I just touched it and it came loose. It wasn't loose loose, but it took almost no effort at all to spin it off. SiCo Omega ran direct thread.
Would that cause my elavation shift like that ? If so, why only elavation ? Windage never moved. Just wild vertical.
I need to load some more ammo and get back out with it.