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Ammo 5.56 NATO Federal BTHP 62 Grain 20 Round Box MK318 MOD-O USMC "SOST" Match Bullet 2925 fps
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Manufacturer: Federal T556TNB1
Item: AMM-2810

5.56x45mm NATO Federal BTHP 62 Grain 20 Round Box MK318 MOD-O USMC "SOST" Match Bullet T556TNB1. The military requested these be marked seconds to be sold to the civilian market.

This new SOST round from Federal Cartridge was engineered for the USMC as a supplemental replacement round to M855 green tip with more desirable terminal characteristics. NSN # 1305-01-573-2229. Designated as MK318 MOD-0 the round was designed as a barrier defeating round with superior penetration and better ballistic stability when shooting through glass, car doors and other barriers where other rounds perform poorly. It was engineered after the Marine Corps identified issues with the M855 round. This round utilizes a 62 grain open tip boat tail hollow point bullet with a lead core and reverse copper jacket creating the open tip.


Non-returnable item. We will not accept any returns on this item.


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Customer Reviews

Most Helpful Customer Reviews

0 of 0 people found the following review helpful
4.0 Rating Decent but Pricey - 5/3/2011
Reviewer: Airborne_Alpha-17
Bought a couple of boxes of this to test against my current go to round, the M855 "green tip" penetrator round. Both are 62 grain, but I was curious to see the difference in POI at 100m or so. Firing from the prone supported, using a FN SCAR 16S with a 16" 1:7 twist barrel, the POI was almost identical to M855 rounds, and grouped very well too. The rounds POI also matches up well with the 64 grain M856 Tracer rounds sold here too. Definitely worth considering if you want a good, BTHP 5.56 round for use as a "SHTF" or "Zombie Defense" round. Only down side, and the only reason why I can't give this 5 stars is the price.
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0 of 0 people found the following review helpful
5.0 Rating MK318 - 10/20/2011
Reviewer: AY
Great ammunition and best price here. Usually use XM193 but these have proven to be much more accurate and consistant...tested 150 rounds @ 100 and 200 yards, 1:9 twist 16" Bushmaster XM-15..never a miss feed either. Now just stocking up on these for the day Zombies take over because I know they will do the job. Another note...first shippment of 500 came with water damage to the boxes (shipping problem). Cheaper than dirt had a whole new shipment in great shape and service sent to me within 2 days from me returning the damaged shippment. Great to do business with you. Thanks!
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0 of 0 people found the following review helpful
5.0 Rating great ammo - 12/17/2011
Reviewer: Camper
Great ammo! all bullets were seated to exacting depths, clean brass, primer and case mouth sealed... Ammo is pricey but you get what you pay for. Good luck even finding a round of this type that matches the quality you get from these. Will no doubt be buying more!
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0 of 0 people found the following review helpful
5.0 Rating Impact test - 1/16/2012
Reviewer: Mizzoubi
Fired several into test medium of half gallon jug of water backed by white wood 2x, 14" wet newsprint, and another 2X. Jugs "mistified" more impressively than by Partizan 69 HPBT used as comparison. There was lead wash around entrance to 2x. Exit from 2x was much smaller than 69 HPBT, same for the destruction channel in wetlap. Penetrated about nine inches of wetlap. Recovered bullets consisted of solid bases expanded to about .26 just forward of crimping groove; front core missing. The 69 HPBT fragments played out by 7 inches. This is gonna be good game ammo, not just SHTF, though richochets may be more of a concern than with traditional HP's.
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0 of 0 people found the following review helpful
5.0 Rating Excellent - 2/1/2012
Reviewer: Load Test
Bought half a case - tested from bipod in 14.5" BCM carbine, 5-shots @25 and @100. The @25 was one hole .50", 3 of @100 were one hole with 1" flyers at 12 and 3 (likely the shooter). Much tighter groups than any of my M855. More consistent than the TAP FPD 75gr, faster and more accurate than the BVAC 62gr, similar to but better consistency @100 than the Fusion 62gr. Cannelure and crimp is good. No sealant on primer. To be clear, the brown box is not mil-spec, it is civilian "loaded similar to MK318".
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Ammo 5.56 NATO Federal BTHP 62 Grain 20 Round Box MK318 MOD-O USMC SOST Match Bullet  2925 fps
Ammo 5.56 NATO Federal BTHP 62 Grain 20 Round Box MK318 MOD-O USMC SOST Match Bullet 2925 fps
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