New FBI 5.56 mm ammunition RFP

[Magic_Salad0892]

Why would they choose this over a 77 gr. OTM type projectile?

Mk. 262 Mod. 01, or Nosler Custom Competition come to mind.

[DocGKR]

Magic_Salad0892: Perhaps because 77 gr OTM's offer incredibly POOR terminal performance after first penetrating intermediate barriers and for LE use, where there is a high incidence of potential engagements around or involving vehicles, ammunition that is able to effectively penetrate intermediate barriers, particularly vehicle glass, is CRITICAL.

[Jake'sDad]

Why would they choose this over a 77 gr. OTM type projectile?

Mk. 262 Mod. 01, or Nosler Custom Competition come to mind.

Disregard...Doc answered it.

[Magic_Salad0892]

DocGKR:

Do 62 gr. type projectiles have better inherent barrier penetration than their 77 gr. counterparts?

Kind of related: Is 75 gr. TAP an OTM?

[DocGKR]

No.

Yes.

[Bolt_Overide]

thanks for the good info doc, how about you send me 10k rounds and ill evaluate the shit out of it for ya.

[Evan_O]

I've searched but cannot not find the press release on this. I want to show this to the uppers at my agency. Anyone have it?

Thx

I'll second that request for anyone in the know. Thanks in advance.

[dbrowne1]

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[Jake'sDad]

In terms of using these loads in shorter barrels (i.e., 10.5" to 11.5"), is there a velocity below which their terminal performance in terms of expansion and in terms of any wounding from temporary cavity, becomes less than acceptable?

In other words, we know that non-bonded loads like the Hornady 8126N have a threshold below which they no longer fragment reliably. Is there an analogous threshold for these bonded loads below which they don't expand or don't offer anything beyond a .22 caliber hole?

One of the benefits of bonded core bullets is their performance through a wide range of velocities. In gelatin, you can expect good penetration, (15"-17") expansion, (.45-.55"+) and weight retention (98-100%) with them out of 10" barrels, and that performance will still be superior after passing through barriers.

[dbrowne1]

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