Lynn,
It depends. Never said I would......if it had good ES. But.....if that load that was giving me one hole groups at 100 yards had 150 fs ES I wouldn't shoot it 1000 yards either. I would find a load with a very low es, tune it to shoot one hole groups at 100 yards with the tuner, and would be just fine at 1000 yards with that load/tune.
If you are going to shoot a load at 1000 with a poor ES, you will need to tune at 1000 yards, not 100.
It depends. Never said I would......if it had good ES. But.....if that load that was giving me one hole groups at 100 yards had 150 fs ES I wouldn't shoot it 1000 yards either. I would find a load with a very low es, tune it to shoot one hole groups at 100 yards with the tuner, and would be just fine at 1000 yards with that load/tune.
If you are going to shoot a load at 1000 with a poor ES, you will need to tune at 1000 yards, not 100.