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90 grain Sierra’s from RMR shoot really good at 1000 yards in .223

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Viewing 8 posts - 1 through 8 (of 8 total)
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  • November 14, 2022 at 10:05 am #459994
    Steven Newcomer
    Participant

    Just an FYI for the guys that like stretching the legs of their 20” AR’s out to 600-1000 yards. With Varget from 24-24.3 grains out of a 20” White Oak National Match upper with a Krieger 1/7 twist it will hold the 10 and X ring (20”) on a LR-1 target if I do my part and sadly it is enviable that it will sling the occasional 9 or 8, but that is on me. Also, that is shooting from a sling unsupported, from a rest and bags it will hold the 10/X ring no problem. I would love to thank Jacob for carrying and selling 90’s for an OUTSTANDING price.

    June 6, 2023 at 10:02 am #494636
    Brian Murphy
    Participant

    We have had good luck with the 90s out of Wylde chambered 1/7 Service Rifles, but that was only shooting them at 600 yards. We had planned to go to a 1K match, but it got rained out. I would be cautious if you are shooting them on acoustic targets at 1K, as I’m not sure that they give enough of a crack to make the targets work reliably. If you are shooting paper, the 90s should work really well.

    June 6, 2023 at 10:11 am #494637
    Steven Newcomer
    Participant

    They will carry enough speed to set off electronic ShotMarkers if you are getting 2675fps out of the muzzle. My 20″ White Oak 1/7 twist with 24 grains of Varget are getting 2700fps muzzle and are good to go.

    June 6, 2023 at 10:30 am #494640
    Brian Murphy
    Participant

    Oh that’s good to know! What’s your elevation where you were shooting them? We were going to be shooting 1K at sea level, so I was a little concerned. I ran the number through Applied Ballistics and they seemed to be right on the edge of supersonic.

    We are using N140 and getting about 2,630 fps. I’m pretty sure Varget has a little more energy and can produce better velocities though. We did try N540 & PP2000 but just could not get the accuracy of the N140.

    June 6, 2023 at 11:10 am #494644
    Steven Newcomer
    Participant

    Elevations are
    29 Palms Marine Base, California = 2100 feet above see level
    Ben Avery shooting facility, Phoenix Arizona 1800 feet
    Boulder Rifle and pistol club, Boulder City NV = 2500 feet
    My elevation from a 200 yard zero is roughly 29-30 MOA

    June 6, 2023 at 11:13 am #494645
    Steven Newcomer
    Participant

    My N140 load is 24.1-24.2 grains with the 90’s and they shoot amazing at 1000. Varget is was my go to, but with N140 I just bumped it up .1-.2 grains with no issues with pressure.

    June 6, 2023 at 11:39 am #494653
    Steven Newcomer
    Participant

    Also, one major thing I would add for shooting the 90’s from RMR is some lots are pretty consistent, but if you mix a few lots of say 500 there can be almost .5 grains +/- on a few bullets. If you are just plinking at 1000 it is what it is, BUT if you are shooting a competition where you NEED to eliminate as many variables as possible I would 100% weigh your bullets with a super accurate scale (I use the A&D120 that measures down to the .02 (2/100ths) of a grain. I keep my batches in roughly .06 +/-. Last thing you want at 1000 is one round weighing 89.70 and the next at 90.26 grains!!! That will translate to about a 3-5ish MOA elevation change on target.

    June 6, 2023 at 12:23 pm #494657
    Brian Murphy
    Participant

    Wow, I’m surprised you are shooting 24.2 of N140 with the 90s. My go to bullet these days is the 80gr ELDm from Hornady and I’m getting 2,700 fps out of them with that same powder charge & LC cases.

    My barrel is a Bartlein 6.5 Transitional and it has a Wylde chamber. I don’t think I could shoot that much powder. We tried 23.7gr in a buddies rifle and it was popping a lot of primers. Incredible accuracy, but too much pressure. It was fine in my Bartlein, but his was a White Oak and it would not take that much powder.

    Thanks for sharing the information, very informative.

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