This is a good starter kit and would be great for loading bulk ammo for a semi-auto like a M82 but it does lack some in quality for true match grade ammo consistantly coming off the press.
The biggest problem is the RCBS dies. They are good general purpose dies but ask yourself if you would use a standard set of RCBS dies for a conventional round for extreme accuracy, probably not.
Get ahold of:
The ultimate is their Straight Line Seater with their Bushing neck sizing die. These are quite spendy though but are about as good as I have tested in 50 BMG dies and if youcan believe it very resonable priced for a match grade set of 50 BMG dies.
These will run $400 for the set.
One of the best presses I have seen on the market for match grade 50 BMG ammo is their 50 BMG Loading Press with the Rack and Pinion design. This is a true match grade press and runs $395.
The Ammomaster press will work well with a set of custom match dies but the RCBS will not offer consistant true match grade ammo.
So if you want the lower cost RCBS press, I would recommend getting the match dies.