AR15.Com Archives
 What does "OTM" mean when referring to ammunition?
DemolitionDamon  [Member]
10/18/2007 6:26:46 PM EST
Yes, I know it's a lame question and I should know but I see this everywhere and can't figure out what it means.
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scottryan  [Team Member]
10/18/2007 8:29:59 PM EST
Politically correct term for hollow point.
cckw  [Team Member]
10/18/2007 9:05:27 PM EST
"Hollow Point" typically means it is designed with a hollow opening into the bullet so that the bullet peels open upon impact.

"OTM = Open Tip Match" These bullet have a very small hole in the tip of the bullet where the lead was poured into it. (A FMJ is open in the back) This open tip is merely a fill hole and there is no shaping of the lead or jacket inside to cause mushrooming upon impact. The OTM bullet is much more consistent in balance then a rear filled bullet.
DevL  [Team Member]
10/18/2007 11:44:33 PM EST
Hornady and Sierra both call their match ammo BTHP or boat tailed hollow point. JAG approved BTHP Sierra bullets as legal for land warfare and these are called open tip match bullets or OTM. It is a legal military term, one not used by the companies that actually make the bullets. They call them hollow points. Not all BTHP can be considered OTM. If the space in the nose is too large JAG wont approve it. It would then be considered a "hollow point" even though it is of nearly identical construction to approved OTM bullets.
JJREA  [Member]
10/19/2007 5:01:14 AM EST
Yes, BTHP = OTM. For the most part
308Sako  [Member]
10/19/2007 5:58:35 AM EST

Originally Posted By cckw:


"OTM = Open Tip Match"

These bullet have a very small hole in the tip of the bullet where the lead was poured into it. (A FMJ is open in the back) This open tip is merely a fill hole and there is no shaping of the lead or jacket inside to cause mushrooming upon impact. The OTM bullet is much more consistent in balance then a rear filled bullet.


This is NOT the way a bullet is formed. Molten lead is not used! The tip is formed under pressure when the bullet is made.
cckw  [Team Member]
10/19/2007 7:13:06 AM EST

Originally Posted By 308Sako:

Originally Posted By cckw:


"OTM = Open Tip Match"

These bullet have a very small hole in the tip of the bullet where the lead was poured into it. (A FMJ is open in the back) This open tip is merely a fill hole and there is no shaping of the lead or jacket inside to cause mushrooming upon impact. The OTM bullet is much more consistent in balance then a rear filled bullet.


This is NOT the way a bullet is formed. Molten lead is not used! The tip is formed under pressure when the bullet is made.


It is more or less correct.. filled from the front through the hole in the tip, perhaps sqeezed down after filled. (Source= Black Hills rep)
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