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I've had good luck with Blackhills 77 & 68 grain loads.
 

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Requiescat In Pace
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The IMI 55 grain BTHP Match round (if you can find it) shot sub 1 MOA groups at 100 meters from a 10.4" HK416 in a test fixture after firing 12,000 rounds during lot acceptance testing in 2004. Not sure if this is available in the US but it was by far the most accurate round from that platform, even better then the 77 grain MK262 round from Black Hills.

G3Kurz
 

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Also while not a 10.5, I used 75 grain Hornady TAP to get a 100 yard, 7 shot, 9/16ths group and a 100 yard, 3 shot, 7/16ths inch group.

Used an Aimpoint PRO with a 2.5x magnifier. I think that a better shooter with better optics could make my MR556 a 1/4MOA gun.
 

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The target with the three seperate shot groups. The oversized one was shot using a **** magnified scope, and only for testing. The second two shot groups were shot after I replaced the PRO and magnifier.



First group with the magnified scope. 4 shots proper and a nasty little flyer. Nearly al groups with the magnified scope did this.



Second, 7 shot group after the magnified scope was replaced by the PRO and magnifier, measured center to center.



Third group, 3 shots with PRO and magnifier, measured center to center.
 

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The IMI 55 grain BTHP Match round (if you can find it) shot sub 1 MOA groups at 100 meters from a 10.4" HK416 in a test fixture after firing 12,000 rounds during lot acceptance testing in 2004. Not sure if this is available in the US but it was by far the most accurate round from that platform, even better then the 77 grain MK262 round from Black Hills.

G3Kurz
Does anybody know if this round is available in the US? I looked at Widners.com, but could not find any. Also tried to look for clone equivalents (55g OTM), but to no avail.

FYI, I have a bunch of IMI equivalent of Mk262 Mod1, but looking for a round that really does well in the SBR lengths/barrels (e.g., Mk318 Mod0 SOST or equivalent).

Given most rounds were designed for the 16" barrel in mind.
 
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