Re: What are the advantages& disadvantages
I will be honest with you. First I don't have a 300wby but in all the rounds I have loaded for the Fed primers have not been all that great for me ( my experience ) I did notice the match primers a little more consistent but varied with powder used. Some powders simply dont like some primers due to reasons unknown by me so I usually work up the same load with more than one primer type and most everytime there is one primer or the other that will be better with the powder I am trying to use. For instance I have found VihtaVouri powder doesn't like rem 91/2 primers at all but seems to like the magnum version better. There are no disadvantages or advantages I can list because I have no experience with that particular round so I would suggest trying them with the same powder and see which one actually produces the best results such as extreme spreads on velocity and group size at given distances.
Guns and ammo, what more do we need?