Hornady .300 Blackout Ammunition 20 Rounds GMX 110 Grains


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These are Bullet Tips NOT Complete Rounds

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Hornady 300 blackout

Hornady .300 Blackout Ammunition 20 Rounds GMX 110 Grains Features:

Accuracy and terminal performance are the cornerstones of Hornady factory loaded ammunition. Great care has been given by Hornady engineers to develop superior rounds that allow the bullet to achieve its maximum ballistic potential.

Hornady .300 Blackout Ammunition 20 Rounds GMX 110 Grains Specifications:

  • Caliber: .300 Blackout
  • Bullet Type: Gilding Metal eXpanding (GMX)
  • Bullet Weight: 110 Grains
  • Rounds: 20 Rounds per Box
  • Muzzle Velocity: 2285 FPS
  • Muzzle Energy: 1275 ft\\lbs.
  • Bullet Diameter: .308″
  • Core Material: Lead
  • Tip Material: Polymer
  • Ballistic Coefficient: 0.305
  • Casing: Brass

300 Blackout List

While I have very few different headstamps in this confusing .300 Whisper, Blackout, 30-221 cartridge, I have a few that I did not find on that list:

JI 30-221
T .300W

included the “T” round from Thun, Switzerland, because it has only .300W for the caliber designation, not .300 WHISPER.

I assume that on the LEHIGH headstamp, “BLK-WH” stands for Blackout-Whisper, indicating to me that the two designations are two names for the same cat.

the “30-221” indicates a .30 caliber cartridge using the .221 case type.


don’t know why I started this round. While I have a lot of loadings, most all of them are on three or four headstamps. I had no idea there were so many different headstamps and from the list of other makers, potential headstamps.
Quite interesting and discouraging at the same time.

Some of the bullets in (and for) this loading are far more interesting than the cartridge itself. Of course I realize that beauty is in the eye of the beholder.

The cases prepared for pressure testing differ somewhat from what I know as standard procedure.
Normally, such a case is first placed in a fixture where a rectangular gap is filed into the rim/base of the case.
This gap corresponds to a stud in another fixture, where the hole is drilled in the case wall.
The pressure barrel also has a stud which ensures alignment of the pressure hole in the case with the pressure gauge in the barrel.

I assume, the straight line visible on the base of the cases shown is used for this alignment instead. This is the first time I see cases prepared for pressure measurements without the gap.

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