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Although not a 10", I have had excellent results in my 14.5" guns with 69gr factory Lapua HPBT as well as the 77gr OTM Black hills offerings. I do have some Mk262 on the shelf, but I have yet to use it with a 416 upper.
 

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Sellier&bellot 55gr at 110 yards with my MR223 14.5 inches and ACOG TA31RCO


By marmoud at 2012-05-09

i ll try RUAG SS109 62gr the next week if i can do better results
 

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

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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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with RUAG SS109 62gr ,i have the same results at 110 yards than the sellier&bellot 55gr
i ll try 55gr fiocchi later
 

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The military did a test a few years ago on the 5.56 in a SBR. It showed that the heavier grain bullets had better accuracy. Not going to get into which brand is better, just passing on the info.
 

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The military did a test a few years ago on the 5.56 in a SBR. It showed that the heavier grain bullets had better accuracy. Not going to get into which brand is better, just passing on the info.
Only experience was with BH 77 grn. from 14.5" bbl. Excellent results.
 

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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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I have to get the exact results from the log but in my standard set up of 10.5 with a m4-2000 the 77 grain MK262 has been the best by far.
 

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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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