Description
The .50 BMG is a beast of a cartridge, and loading it takes more press than your standard rig can offer. This RCBS AmmoMaster .50 BMG Conversion Kit (part number 88709) takes the single stage AmmoMaster you already own and upgrades it to handle the massive dimensions of .50 Browning Machine Gun brass. Instead of buying a dedicated press from scratch, you bolt on the right parts and keep rolling with gear you already trust.
What the AmmoMaster .50 BMG Conversion Kit Actually Does
This kit swaps your press over to accept 1-1/2 inch by 12 TPI dies, which is the thread size the .50 BMG demands. Inside the box you get a .50 BMG shell holder sized to grip that huge case head, a .50 BMG ram priming unit for seating the big primers, and a new top plate drilled and threaded for the larger dies. It also ships with three longer steel support rods, since the taller die stack needs more room to work than the standard setup allows.
Fitment Notes for the AmmoMaster Single Stage Owner
This is the part worth repeating: the 88709 kit is built for the original single stage AmmoMaster. If you already run an AmmoMaster-2, you do not need this kit, because that press comes ready for .50 BMG out of the gate. Matching the kit to the right press saves you a headache, so double check which model sits on your bench before ordering. The dies themselves are sold separately, so plan on grabbing a 1-1/2 inch .50 BMG die set to finish the job.
RCBS has been building reloading gear for decades, and this kit carries their limited lifetime warranty. It is made in the USA and built from the same heavy cast components the AmmoMaster line is known for, which matters when you are working cases this large and generating this much force on the downstroke.
Key Specifications
- Manufacturer: RCBS
- Manufacturer Part Number: 88709
- UPC: 076683887092
- Caliber: .50 BMG
- Compatible Press: AmmoMaster Single Stage (not AmmoMaster-2)
- Die Thread Size: 1-1/2 inch x 12 TPI
- Press Type: Single Stage
- Warranty: RCBS Limited Lifetime
- Country of Origin: Made in USA
- Shipping Weight: 8.55 lbs
What’s Included
- .50 BMG Shell Holder
- .50 BMG Ram Priming Unit
- Top Plate threaded to accept 1-1/2 inch dies
- Three longer steel support rods
Frequently Asked Questions
Will this conversion kit work with my AmmoMaster-2?
No, the AmmoMaster-2 already comes set up to load .50 BMG right out of the box, so you do not need this kit. The 88709 kit is made specifically for the original single stage AmmoMaster press. Check which model you own before ordering so you get the right part.
Does the AmmoMaster .50 BMG Conversion Kit include dies?
No, the dies are sold separately. This kit gives you the shell holder, ram priming unit, top plate, and longer support rods needed to accept the dies. You will want to pair it with a 1-1/2 inch by 12 TPI .50 BMG die set to load complete rounds.
What exactly comes in the box?
You get a .50 BMG shell holder, a .50 BMG ram priming unit, a top plate threaded for 1-1/2 inch dies, and three longer steel support rods. Together these parts adapt the standard AmmoMaster to handle the larger case and taller die stack of the .50 BMG.
Is this kit covered by a warranty?
Yes, it carries the RCBS limited lifetime warranty. RCBS has built reloading equipment for decades and backs their gear, so you can run it hard with confidence. It is also made in the USA.





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