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Powder Compression Die
The ARIES Powder Ram™ Powder Compression Die separates powder compression from bullet seating. This eliminates the problems associated with using the bullet and bullet seating die to compress the powder.
If you load rifle cartridges with a compressed powder charge, the bullet and bullet seating die are used as a ram to compress the powder. This can deform the bullet, resulting in significant loss of accuracy. This deformation can appear as a ring or scuff mark around the bullet ogive, or can be so slight as to be unseen by your eyes. If you use separate seat and crimp dies, there is also a chance that the compressed powder will push the bullet back out before being crimped, resulting in longer cartridge OAL. Ideally the powder should be compressed before bullet seating.
Floating Powder Compression Plug

AVAILABLE RIFLE CALIBERS: .224, .243, .264, .284, .308, .38 and .45.
Yes! The ARIES Powder Ram™ can be used for either smokeless or black powder cartridges.
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For Pistol Cartridges | |
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* As with the bottleneck rifle cartridges, the powder compression plug for pistol cartridges is slightly undersized relative to the bullet diameter. So it will not affect the size of the cartridge case mouth. | |
Size* | Description |
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For 9mm, .38 Special and similar cartridges using a .356"-.357" diameter bullet. DISCONTINUED |
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For .45 Colt, .45 ACP and similar cartridges using a .450"-.458" diameter bullet. |
Single Stage Reloading Presses
Just set up the ARIES Powder Ram™ and compress all the cartridges in your loading block, then install your bullet seating die and continue as usual.
Progressive Reloading Presses
Works Great in progressive presses too! In progressive presses that use separate seat and crimp dies, the ARIES Powder Ram™ typically installs in the bullet seating die station and a combined seat/crimp die is used. Below are examples for several popular progressive presses:
• Dillon RL 550B: The ARIES Powder Ram™ installs in Station 3, instead of the bullet seat die, and a combined seat/crimp die is installed in Station 4.
• Dillon XL 650: The ARIES Powder Ram™ installs in Station 3, instead of the powder check, and the standard bullet seat (Station 4) and crimp (Station 5) dies are used.
• Dillon Super 1050: The ARIES Powder Ram™ installs in Station 6, and the standard bullet seat (Station 7) and crimp (Station 8) dies are used.
• RCBS® Pro 2000®: The ARIES Powder Ram™ installs in Station 4, and a combined seat/crimp die is installed in Station 5.
ARIES Powder Ram and the Aries logo are trademarks of UniqueTek, Inc. RCBS and Pro 2000 are registered trademarks of RCBS. |
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Specifications | |
Die Body | 7/8"-14 Threads |
Adjustment Screw |
5/8"-18 Threads (0.055″/turn) |
Compression Plug Material | 12L14 Steel |
Features | Benefits |
Compresses Powder Before Seating Bullet | |
Eliminates Bullet Deformation | |
Adjustable Powder Compression Depth | |
Can be used with Smokeless or Black Powder |
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