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If you're loading .50 BMG on an RCBS AmmoMaster press, priming those big cases by hand gets old fast. This ram priming unit solves that by bolting into your AmmoMaster and letting you seat primers right at the top of the press stroke, where you get the best sense of feel for how deep each primer is going. For a cartridge this size, that tactile feedback matters a lot, and it makes consistent, repeatable seating a whole lot easier.
Priming at the top of the stroke is the key detail here. Instead of fighting a primer tool down at the base of the press, you're working up top with full leverage and sensitivity, so you can actually feel the primer bottom out in the pocket. That's a big deal with .50 BMG, where a primer seated too shallow can cause a light first strike, and seating too hard risks crushing the cup. This unit gives you the control to get it dialed in.
The .50 BMG world runs two primer styles, flat and domed, and this unit ships with both a flat and a cupped primer plug to cover them. Domed primers like certain CCI numbers often perform best when slightly flattened during seating, so having the right plug on hand lets you set them up the way you want. Swap the plug to suit your components and you're ready to go.
This is a dedicated accessory for the RCBS AmmoMaster single stage press, so it's not a standalone bench tool. It works alongside a .50 BMG shell holder, which secures the case while the ram seats the primer. If you're already set up for BMG-based cartridges on the AmmoMaster, this piece rounds out the priming side of your loading bench and takes a tedious step off your hands.
No, this unit is designed specifically to work with the RCBS AmmoMaster single stage press. It mounts into that press to prime .50 BMG cases and isn't a standalone bench-top priming tool. If you're running an AmmoMaster for BMG loading, this is the matching priming piece.
The .50 BMG uses two different primer styles, and the two plugs let you handle both. Domed primers often perform best when slightly flattened during seating, so the flat plug handles that job, while the cupped plug suits the other style. Having both means you can match the plug to whatever primers you're loading.
It primes at the top of the press stroke, which gives you better feel and sensitivity as the primer seats. With a case as large as the .50 BMG, that extra feedback helps you seat primers to a consistent depth. It's one of the reasons this setup is easier to control than fighting a primer down at the base of the press.
Yes, a .50 BMG shell holder secures the case while the ram seats the primer, and it is sold separately. If you're already loading .50 BMG on your AmmoMaster you likely have the correct shell holder on hand. Just make sure you've got the right one before you start priming.
| UPC | 076683887726 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 88772 |
| Shipping Weight | 0.7 |
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