Well you have the throat variable going on in the Weatherby...how long is the freebore and how tight the throat is will have a big influence on how much powder you can safely burn without pressure in an individual rifle. Each rifle is a unique sample of "1".
Some of the loads that Roy Weatherby gave me when he was building the rifles would likely take a newer rifle apart, but the cases didn't show any pressure signs.
I don't see the point of running 180s to the max though. If more downrange performance is the goal, a sleek heavier 200-220 gr bullet from an accurate 300 Win at several hundred fps less will hang with the 180 AB out of the Weatherby past 5-600 yards.
I always liked my Weatherby for 200 NP as a go to load. I only ran the 180s for reduced loads when I didn't need a blaster back when it was my only rifle.
But the 180 AB, at 3200 fps...that should be doable in most Wby rifles and is a very good LR load... I would want to find the most accurate load.
