95 SMK in 223, anyone try yet?

Discussion in 'Small Stuff--22s, 20s, and 17s' started by Fuzzy1968, Jan 27, 2018.

  1. Fuzzy1968

    Fuzzy1968

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    Im curious to know if anyone has got their hands on the Sierra 95 SMK and have shot in their 223 yet.
    I received 500 the other day and this morning started doing measurements and as I suspected, they are way too long for my chamber cut with a .169 freebore. Since I have two great shooting 6.5 twist barrels, I decided to sacrifice one barrel to experiment and cut the throat another .110 deeper with a PTG throater so the bullets sit in the neck where they are supposed to. These new 95's are pretty long, it might be a waste of a barrel or at least cost me a set back but they are worth the effort.
     
  2. Mark W

    Mark W Silver $$ Contributor

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    Personally I would prefer a little more case capacity than a .223 has to offer for a 95 grain bullet. What kind of velocities are you expecting from this combo?
     
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  3. 556Griff

    556Griff

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    How long are they?
     
  4. gstaylorg

    gstaylorg Silver $$ Contributor

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    http://forum.accurateshooter.com/threads/new-224-matchking.3941880/

    In my hands, they're shooting extremely well so far. However, you're really going to want a 32" barrel and a throat with somewhere in the neighborhood of .250" to .300" freebore, possibly even a little more, in order to get the most out of them. A rifle throated for 90 VLDs with a 30" barrel will run into major pressure issues with the 95s when trying to hit the node analogous to that of running the 90s in the 2820-2850 fps range with Varget or H4895. If you drop the velocity sufficiently to alleviate the pressures issues with the small .223 case, you'll largely be giving up the ballistic advantage of the 95 SMK.
     
    Last edited: Jan 28, 2018
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  5. B23

    B23

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    Mine are 1.293 long but I read through that other thread and one guy said his were considerably shorter while another guys were a tick longer at 1.300. All I know is I measured five of them and they all were nearly exactly the same, give or take a thou, at 1.293.
     
  6. watercam

    watercam Gold $$ Contributor

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    I noticed that Sierra used some slower powders in their load data (but kept the OAL appropriate for a standard chamber - in other words, useless). Couple of 4350 burn rate powders in there. Might be worth a try if I can bring myself to cut an even longer throat. Also wondering about barrel life!
     
  7. paperpuncher

    paperpuncher Silver $$ Contributor

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    In your experience how much twist is actually required for this bullet. Planning a 223 rem at around 1000' above sea level. Going to order a tube and try these out this spring. What contour do you prefer for a 32" tube. Can I simply chamber with the issf reamer and just move the throat out to .250-.300".
     
  8. gstaylorg

    gstaylorg Silver $$ Contributor

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    Minimum 6.8 twist necessary for full BC at 65 degrees and 500 ft elevation, according to Berger's Twist Rate Calculator. Slightly faster if you're shooting on the beach in January and February, maybe a 6.5-twist.

    Yes, a barrel cut with the ISSF reamer and then throated longer should definitely work. As far as contours for a 32" barrel, I'd go with whatever the heaviest contour is that allows you to safely make weight with the rest of your specific setup.
     
    Last edited: Feb 10, 2018
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  9. paperpuncher

    paperpuncher Silver $$ Contributor

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    Thanks for the advice I sent you a pm
     

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