Good evening AL I have 2 280AIs one is a Kimber Montana , I tried 150 ABLR and they would not shoot very well, I tried some 168 VLDS with 58GR 4831sc fed 210 primers at 3.375 well I was able to shoot a 4 shot group at about .65 at 100 yards , I tried the same load in my Cooper and it did not shoot well, i tried a ladder test, as well as I tried a seating depth test and not great results . I tried some 162 AMAX but had to load them sat 61 GR of 4831sc witch is really hot before they would shoot for me , so onto some 140 nosler Ballistic tips I took the exact load data from Nosler web site and well i had a ragged 4 hole group so I have kept this load. It seems most load data with the 168 GRS in 4831sc runs in the 58-59.5 GR range and if you read the sticky on this forum about bergers you will be on the right track, If I could get my hands on 160 Nosler AB I would go that way .
Matt
Matt