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The Range
NFA & Class III Discussion
10.5” 5.56 SBR Ammo Recommendations
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<blockquote data-quote="JEVapa" data-source="post: 3683308" data-attributes="member: 41176"><p>So I think we are both correct and incorrect to which I can own. I should have known better than to apply a rule that works better for heavier/slow-er projos to small fast rounds and and shorter than 16". I also knew better as I've done this before on some stuff in a previous career but the 400fps in 5.5" pushed a button.</p><p></p><p>I went out on Monday and got the below data from 3 different guns: MK12 18" 1-8, Recce Rifle 16" 1-7, and a MK18 URG 10.3" 1-7. Two cartridges were MK262 77gr and M193 55gr (LC), with no mixed lots, and 5 round groups. (commercial)</p><p>No Atmospherics measured, but if someone's really concerned about it, they can go to the weather channel and look at Monday's data for Cement at 1400-1600.</p><p></p><p>BLUF: I'd take 77gr over 55gr for a 10.5", period. @18" MK262 is <em>2792fps</em>, M193 is <em>3313fps</em>; @16" MK262 is <em>22670fps</em>, M193 is <em>2992fps</em>; @10.3" MK262 is <em>2423fps</em>, M193 is <em>2667fps</em>. From <u>18" to 10.3"</u>, MK262 has a MV loss of <strong>369fps </strong>and M193 has a MV loss of <strong>646fps</strong>. <u>18" to 16"</u> was <strong>122fps </strong>and <strong>321fps </strong>respectively. <u>16" to 10.3"</u> was <strong>247fps </strong>and <strong>325fps </strong>respectively. </p><p>Both rounds were still smoking out of a 10.3" bbl. MK262 at 2423fps is certainly not barely over 2kfps and will wreck somebody's day all day every day. The M193 is over 2650 and out of a 10.5" bbl, would probably be closer to 2700fps. </p><p></p><p>No data on a 14.5", maybe later.</p><p>Additionally, MK262 from a 10.3" (2423fps) goes <u>trans at ~660m</u>; M193 (2667fps) goes <u>trans at ~530-560m</u>. MK262 has consistently more energy as well. </p><p></p><p><strong><u>MK12 18” BBL</u></strong></p><p>MK262</p><p>AVG 2792 ES 33 S-D 16</p><p></p><p>2777</p><p>2809</p><p>2779</p><p>2787</p><p>2810</p><p></p><p>M193</p><p>AVG 3313 ES 64 S-D 24.9</p><p></p><p>3325</p><p>3351</p><p>3287</p><p>3305</p><p>3300</p><p></p><p><strong><u>RECCE RIFLE 16” BBL</u></strong></p><p>MK262</p><p>AVG 2670 ES 34 S-D 13.2</p><p></p><p>2666</p><p>2680</p><p>2672</p><p>2685</p><p>2651</p><p></p><p>M193</p><p>AVG 2992 ES 86 S-D 31.6</p><p></p><p>2947</p><p>2996</p><p>3006</p><p>2982</p><p>3033</p><p></p><p><strong><u>MK18 URG 10.3” BBL</u></strong></p><p>MK262</p><p>AVG 2423 ES 30 S-D 12.3</p><p></p><p>2428</p><p>2432</p><p>2418</p><p>2404</p><p>2434</p><p></p><p>M193</p><p>AVG 2667 ES 83 S-D 31.9</p><p></p><p>2612</p><p>2675</p><p>2678</p><p>2677</p><p>2695</p></blockquote><p></p>
[QUOTE="JEVapa, post: 3683308, member: 41176"] So I think we are both correct and incorrect to which I can own. I should have known better than to apply a rule that works better for heavier/slow-er projos to small fast rounds and and shorter than 16". I also knew better as I've done this before on some stuff in a previous career but the 400fps in 5.5" pushed a button. I went out on Monday and got the below data from 3 different guns: MK12 18" 1-8, Recce Rifle 16" 1-7, and a MK18 URG 10.3" 1-7. Two cartridges were MK262 77gr and M193 55gr (LC), with no mixed lots, and 5 round groups. (commercial) No Atmospherics measured, but if someone's really concerned about it, they can go to the weather channel and look at Monday's data for Cement at 1400-1600. BLUF: I'd take 77gr over 55gr for a 10.5", period. @18" MK262 is [I]2792fps[/I], M193 is [I]3313fps[/I]; @16" MK262 is [I]22670fps[/I], M193 is [I]2992fps[/I]; @10.3" MK262 is [I]2423fps[/I], M193 is [I]2667fps[/I]. From [U]18" to 10.3"[/U], MK262 has a MV loss of [B]369fps [/B]and M193 has a MV loss of [B]646fps[/B]. [U]18" to 16"[/U] was [B]122fps [/B]and [B]321fps [/B]respectively. [U]16" to 10.3"[/U] was [B]247fps [/B]and [B]325fps [/B]respectively. Both rounds were still smoking out of a 10.3" bbl. MK262 at 2423fps is certainly not barely over 2kfps and will wreck somebody's day all day every day. The M193 is over 2650 and out of a 10.5" bbl, would probably be closer to 2700fps. No data on a 14.5", maybe later. Additionally, MK262 from a 10.3" (2423fps) goes [U]trans at ~660m[/U]; M193 (2667fps) goes [U]trans at ~530-560m[/U]. MK262 has consistently more energy as well. [B][U]MK12 18” BBL[/U][/B] MK262 AVG 2792 ES 33 S-D 16 2777 2809 2779 2787 2810 M193 AVG 3313 ES 64 S-D 24.9 3325 3351 3287 3305 3300 [B][U]RECCE RIFLE 16” BBL[/U][/B] MK262 AVG 2670 ES 34 S-D 13.2 2666 2680 2672 2685 2651 M193 AVG 2992 ES 86 S-D 31.6 2947 2996 3006 2982 3033 [B][U]MK18 URG 10.3” BBL[/U][/B] MK262 AVG 2423 ES 30 S-D 12.3 2428 2432 2418 2404 2434 M193 AVG 2667 ES 83 S-D 31.9 2612 2675 2678 2677 2695 [/QUOTE]
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