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Thread: BCM 18" SS410 Accuracy at 600 yards

  1. #1
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    BCM 18" SS410 Accuracy at 600 yards

    I am posting this for a friend who wants to purchase a quality SPR-type rifle. He wants an 18" BCM SS upper, Geiselle trigger, ADM mount, and Nightforce 2.5-10

    I've shot many AR15 type rifles at 600 yards, but I came to realize that I've never shot a "legit", quality rifle properly setup for that distance. It's always been goofing off with a 10.3" and T1, or a 12.5" and TA31, or a 16" chrome lined with iron sights.

    At 600 yards with quality handloads, what type of group size can be expected at this distance with the above setup? I want actual figures from people who have done this, not guesses. This guy is hoping to hang with my Krieger bbl .308, , does he have a shot?

    How consistently could he hit a 4" gong, for example?
    Why do the loudest do the least?

  2. #2
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    I might not have the exact distances you are looking for, but just last weekend we were ringing a 8 inch target at 450 yds. 90% accuracy. BCM SS410 16". SWFA 1-4 using Wolf Gold and AE.223. My 75 gr (hornady) hand loads are about MOA for me. A better shooter could do better for sure.
    Last edited by Shiz; 04-14-15 at 00:21.

  3. #3
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    I appreciate that. That's decent given the ammo.

    My statement regarding no guesses what meant toward internet commandos.

    Quote Originally Posted by Shiz View Post
    I might not have the exact distances you are looking for, but just last weekend we were ringing a 8 inch target at 450 yds. 90% accuracy. BCM SS410 16". SWFA 1-4 using Wolf Gold and AE.223. My 75 gr (hornady) hand loads are about an MOA for me. A better shooter could do better for sure.
    Why do the loudest do the least?

  4. #4
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    Quote Originally Posted by Eurodriver View Post
    I am posting this for a friend who wants to purchase a quality SPR-type rifle. He wants an 18" BCM SS upper, Geiselle trigger, ADM mount, and Nightforce 2.5-10

    I've shot many AR15 type rifles at 600 yards, but I came to realize that I've never shot a "legit", quality rifle properly setup for that distance. It's always been goofing off with a 10.3" and T1, or a 12.5" and TA31, or a 16" chrome lined with iron sights.

    At 600 yards with quality handloads, what type of group size can be expected at this distance with the above setup? I want actual figures from people who have done this, not guesses. This guy is hoping to hang with my Krieger bbl .308, , does he have a shot?

    How consistently could he hit a 4" gong, for example?
    My 16" BCM SS upper runs 3/4 of a minute with CBC 77g OTM. So in zero wind, doing my part I'd be super happy with a 4.5" group. You're not going to be able to do that without match ammo.

    But the wind is going to be the biggest issue with 5.56 at 600yd. At 600 with the gun above, with 9mph wind my hold is 5.9mils. If I call it at 10mph my DOPE is 6.6mil. That's ~5.48cm for being 1 mph off in your wind call. May not matter if the wind is consistent and you can walk onto the target, but again usually wind is changing.
    Last edited by kevN; 03-31-15 at 11:29.

  5. #5
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    I have a 20" that I turned the barrel down to .750 under the hand guard. No problem shooting 1/2 - 3/4" @100 yards. No problem hitting prairie dogs @ 500 with 55 grn hornady hand loads. My 18" JP barrel is even more accurate but also more money.
    Last edited by PrarieDog; 03-31-15 at 22:05.

  6. #6
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    Ask Markm or Pappabear. They were doing some crazy no shit long distance stuff out to 1000 yards.



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  7. #7
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    Quote Originally Posted by Iraqgunz View Post
    Ask Markm or Pappabear. They were doing some crazy no shit long distance stuff out to 1000 yards.
    Weren't they doing some of that with a 14.5 barrel too?

    Sent from my Nexus 6 using Tapatalk

  8. #8
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    I just bought the same BCM 18" upper with the ss barrel and 1/8 twist. I am going to scope it with a Trijicon TR24G. This is going to be my DM/Coyote gun. I am looking for any load info for 77 gr. OTM's or Hornady 55gr. VMatch bullets using Varget powder. MARKM please chime in ?
    Quote Originally Posted by Eurodriver View Post
    I am posting this for a friend who wants to purchase a quality SPR-type rifle. He wants an 18" BCM SS upper, Geiselle trigger, ADM mount, and Nightforce 2.5-10

    I've shot many AR15 type rifles at 600 yards, but I came to realize that I've never shot a "legit", quality rifle properly setup for that distance. It's always been goofing off with a 10.3" and T1, or a 12.5" and TA31, or a 16" chrome lined with iron sights.

    At 600 yards with quality handloads, what type of group size can be expected at this distance with the above setup? I want actual figures from people who have done this, not guesses. This guy is hoping to hang with my Krieger bbl .308, , does he have a shot?

    How consistently could he hit a 4" gong, for example?
    Last edited by meausoc; 04-01-15 at 10:54.

  9. #9
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    Also not exactly what you are looking for but my buddy has an 18" BCM SS upper topped with a Razor HD gen1, SSA-E trigger and this past weekend he had no problem ringing the 14" steel at 660 yards over and over. This was with CBC 77gr. OTM ammo. With the right handload, trigger, and shooter a 4" gong at 600 should be doable. At 600 his wind calls are going to have to be tighter than yours with heavier 30 cal bullets.

  10. #10
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    Good to hear, I have an 18" BCM upper in the pipeline right now.

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