Re: Black Hills 77gr OTM not in the catalog
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KevinB-KAC</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: longebow</div><div class="ubbcode-body">BLUF: OTM = HPBT Match
The "open tip match" (OTM) designation is a legal description used by DOD JAG to argue for the use of these bullets in combat. The Geneva and Hague Conventions have strict prohibitions against projectiles from causing "unnecessary suffering." The argument at the time stated two major issues in the use of OTM:
1. These bullets perform similiarly (in ballistic gellatin) to full metal jacket bullets already in use.
2. These bullets are more accurate, thus reducing "collateral damage" (hitting non-combatants).
JAG was successful in getting these OTM bullets and ammunition approved for combat use. It can be found in both 5.56 (Mk262)and 7.62 (M118 LR) NATO ammunition.
OTM is a more accurate description, and helps to prevent confusion that can occur when the designation "hollow point boat tail" is used. Match bullets (Sierra in this discussion) have an open tip as a consequence of bullet manufacturing processes, but there is an air space in front of the lead core within the copper jacket. A true hollow point bullet (as typically found in hunting bullets or self-defense handgun bullets) has a cavity within the lead core. This encourages the bullet to expand when it hits a fluid or solid object. This type of bullet is absolutely prohibited for use in combat.
The Mk 262 Mod 0 was loaded (typically) with the Sierra 77 grain MatchKing bullet. During full auto fire, and when suppressors were used, bullet set back occured. This resulted in the Mk 262 Mod 1, which used the cannelured bullet, reducing the occurance of bullet set back.
I hope that this helps. </div></div>
One additional Note -- briefly the 77gr Nosler was used in the Mod1 as Sierra was resistant to the Cannelure.
As Longebow stated the OTM is BTHP.
I get Mk262 from BH, I also get Red and Blue box 77gr -- same bullet, don't sweat it.
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So are the OTM (Mk262) and the Red box exactly the same, and the Blue box differs only in the brass being once fired?