Weatherby rifles are always "interesting" to load for. I have a buddy w/2 custom built 300 wby....by the same maker. The first one is a hunter w/normal wby type freebore. We worked up a load just short of normal Max data. The other one was built for "accuracy" w/virtually no freebore. We backed off the first guns load 3 grains......fed it to the 2nd gun.....and promptly began to blow primers out of the cases. I think we were only a grain or two over start loads. THAT was an eye opener.