I’m looking at buying a 50BMG and Ill be loading for it which press die set up would be the best bang for the buck here are my options.
Hornady Lock-N-Load Single Stage Press 50 BMG with Dies
Material: Cast Alloy
Kit Includes: 
•  .50 BMG 2 die set
Ram Stroke: 4-1/2"
Priming Feature: Ram Prime system included
Number of Mounting Holes: 3
Notes: 
•  Accepts all .50 BMG 1-1/2 x 12 threaded dies and .50 BMG shellholders
•  7/8 x 14 thread die adapter included
•  Shellholder adapter is needed to reload using standard shellholders, sold separately
Warranty: 
•  Lifetime
$468.00
 
Lee Classic Cast Press 50 BMG Kit
Material: Cast Iron
Features: 
•  Steel die insert is removable, when removed the press accepts 1-1/4 x 12 thread dies
Kit Includes: 
•  Press
•  .50 BMG Die Set, 1-1/4 x 12 thread
•  .50 BMG Shellholder
•  .50 BMG Ram Prime Tool
Ram Stroke: 4"
Priming Feature: Automatic primer arm with large and small primer cups included
Number of Mounting Holes: 3
Notes: 
•  Accepts all standard 7/8 x 14 threaded dies and standard shell holders
•  Ram insert is adjustable for right or left handed priming
Warranty: 
•  2 Year Unconditional Guarantee
$153.00
RCBS AmmoMaster Single Stage Press 50 BMG Pack 
Material: Cast Aluminum Press Body, Cast Iron top plate
Features: 
•  Set up to use 1-1/2" x 12 threaded dies
Kit Includes: 
•  RCBS .50 BMG 3 Die-Set (Full-length Sizer, Trim Die and Seating Die)
•  Ram Prime Unit for .50 BMG
•  .50 BMG Shellholder
Ram Stroke: 6-3/4"
Priming Feature: .50 BMG Ram Prime Unit included
Number of Mounting Holes: 3
Notes: 
•  Adapter for 7/8 x 14 dies included
•  Adaptable to accept all standard shellholders, adapter not included
Warranty: 
•  Lifetime warranty for individual use, commercial use voids warranty
$430.00
Those are my options at the time unless someone else can direct me to another set up.
Thanks Warf