Consider taking the best brand or two of ammo and then also trying at 200 yards.
Recently tuned my uncle's Sako 30-06 before he went out to WY antelope hunting
. His best group at 100 yards using 4 different types of ammo was 1 1/4" - and that's being nice about it.
We narrowed it down to the best 2, but tried all 4 types at 200 yards. One of them put 4 shots into 1 1/4" at 200 yards - effectively half the MOA it showed at 100 yards. Needless to say, that was the ammo he chose for his hunt.
Worth a try anyway.