Thread: Powder for 303 150's

This question probably has already been asked but I can't find anything on this forum so I'm gonna ask anyway.
Has anyone had any luck using Winchester 748, 760 and ADI AR2206h behind 303 jacketed 150g boolits?
I already have tried 748 and 760 but not having much luck. Terrible grouping and low pressure signs with brass. Has anyone got a recipe that works?
Running low on AR2208 and plan to buy some 2206h for my cast boolits but I'd like to know if it shoots 150g boolits just as well as 2208, which I've had great success with. Any and all advice will be appreciated.