I'm at a loss

[DocBII]

TS,

Did you shoot at any of the shorter range targets? Did you shoot a box test (one shot at each corner) to check how badly you were missing the target. Conditions can change zero from one range to the next.

DocBII

 

[Dgd6mm]

Today was the worst day of shooting I've ever had. I can't figure out what's wrong.
3 weeks ago I shot a 598 with lots of X's and took 2nd place. Came home, did the normal
cleaning routine and put rifle in safe. Took it out this AM and went to a new range. Shooting steel
at 600, 800, 900 & 1000. I was excited as I've never shot past 600. I had dope off a ballistic app to get me started.
Started at 600 with my normal 600 dope. ???? Missed the whole 24" piece of steel. shot 3 more with the same result.
OK, now I'm worried. Checked scope and base, all tight. Checked action screws, all good. I didn't even bother to try 800 or beyond, what's the point? Something is seriously wrong.
Came home and checked headspace, thinking the barrel nut could have loosened. (Savage #12 target action) Nope, head space was exactly where I initially set it at .002". I also bore scoped it, didn't see anything crazy. PLEASE, DON'T EVERYONE JUMP ON THE CARBON RING WAGON . So what's left? Possibly the scope has died internally. I did check and the crosshairs are moving in all 4 directions as they should. Possible that it's just not holding zero??
I'm going to my home range in the AM and will shoot at 100 yds. At that distance, it's a 1/4 MOA rifle. 6 Dasher.
Shillen barrel 28" 1/7.5 105 Berger Hybrids, Varget.

Any thoughts other than a bad scope that could do this? You don't go from 1/2moa at 600 to totally missing a 24" piece of steel.
View attachment 1696295

I'd be at a loss also if I shot a target like that at 600 yards and then the next time out I couldn't touch a
24"x24" steel plate at 600 yards. I'm following with Hope's that you get it figured out in the morning.