I had the Lee Press & Dies. I had a very hard time (often impossible & I'm a big guy) resizing once fired cases, that were fired from a machine gun. I annealed these cases prior to resizing. I ended up having to go to my buddies place and use his RCBS, which had far more leverage.
I shoot my 50 in FCSA Competition and have a custom chamber with a .554 throat. I had several issues with not being able to get the bottom portion of the case to resize properly. When I contacted Lee, they offered to "shorten" my dies to get better results at the "head" of the cases. I ended up selling my Lee press/dies to someone that had a stock chamber and had zero intention of loading match quality ammo. As just an FYI, I have a total of 5 presses for loading 21 different calibers. 4 of the 5 are all Lee, ranging from their little "C" press through a Loadmaster Progressive. I love them for everything except the 50 BMG.
For my 50 BMG I waited for a sale and found a Hornady Press and Dies for under $400. This included the priming setup, and shell-holder. I like the fact that the Hornady has much more leverage, and tighter tolerances on the die's. I also like the fact that they use the standard 1 1/2"-12 Dies, as opposed to the Lee 1 1/4"-12 (not compatible with other 50 presses). The Hornady also came with the "Lock-N-Load" Bushings, which allow setting the dies once, and a quick change ability.
I like the Hornady Dies over the RCBS mainly because of the design of the sizing die. It allows me to raise the expander ball up to a point, where it expands while the case neck is still supported by the die, which appears to help in neck runout. OldmanFCSA also taught me this trick. He added more threads to his RCBS die (resizing ball shaft) and accomplishes the same thing.
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