She finally shot it at a mid range match. The range doesn’t allow muzzle above horizontal when loading. It was her first time using a left upper, optics and loading with it in her shoulder. The left hand port made it easy loading with it shouldered.
Her 20 round scores started 78% and 80% and half way through jumped to 90% and 91%, a personal best. She said she figured out her sling was slipping causing her to string vertically.