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Thread: Black Hills tipped SMK's 77 and 175

  1. #91
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    Gamewarden,

    I checked on accurate shooter and the on line JBM ballistic calculator for Litz G7 data for the 175 TMK and the 77 TMK and neither is listed that I could find.

    Do you know what they are?


    I just shot a good group at 900 yards with the 75 Hornady T1 moly coated bullets at 2920 fps average using the Litz data and it was very close to what was predicted.

    Thanks.

  2. #92
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    Post #89 shows the 175 TMK Litz G7...

  3. #93
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    Thanks, an honest to god ten percent increase over the 175 SMK. (.267 vs .243) thats alot! Probably 1 - 1.5 MOA less dope at 1,000 yds. Thanks for link to Mr. Litz's facebook page.

  4. #94
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    Pappabear and I shot the 175s today in our hand loads. The only variable being that the 175 SMKs were loaded in LC LR brass (slightly lower internal case volume) And the 175 TMKs were loaded in Lapua brass. These shot EXACTLY the same POI at 100, and come up was EXACTLY the same at 1070 yards. I literally shot a mag with regular SMKs first and TMKs behind them, and there was no difference in POI.

    We only had a dozen loaded up. So we'll get another run at these next time, but with all Lapua brass and a chrono to get better info.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  5. #95
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    Thanks Markm,

    That is really interesting.

    Maybe the SMK's had slightly higher velocity than the TMK's due to LC brass?

    How many mils were you using for elevation at 1070?

    PS Ive loaded up some 175 Barnes Match Burners which are more of a VLD/secant ogive than the SMK's at 2700 fps (honest) using VV550. Not super accurate at 100 (around an inch instead of clover leafs) but it might be a good 1000 yd+ load.

  6. #96
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    At 1070 I think we were 12.5mils. We were shooting a FN SPR with 24 inch barrel and SDN6. So velocity is good. We didn't write dope down so it was a bit of a cluster ****. We were slamming rounds for 2.5 hrs straight.

    Taking Chrono next with quality data. And I won't fork up and leave my Lapua 308 ammo. I was messing around with a few .22's. Same story there, ammo matters. Eley Tenex shot holes in holes. Annie 1416HD
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  7. #97
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    Well I'm glad there wasn't a drastic difference in my case...my 308 LaRue PredatOBR is not a fan of the Blackhills loaded 175 TMK. It likes GMM though. Groups were consistently around 2 moa (tmk). SD on the BH's from my magneto speed was around 12 fps.
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  8. #98
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    Quote Originally Posted by 556x45 View Post
    Maybe the SMK's had slightly higher velocity than the TMK's due to LC brass?
    That's what I was thinking. When we shot the 77 grains head to head, we could see a noticeable improvement, but the .308 is a different animal. As with the .223, the bullet takes up a bunch more of the internal case volume which could be doing some weird stuff to velocities. There were no pressure signs, so who knows?
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  9. #99
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    Quote Originally Posted by Pappabear View Post
    At 1070 I think we were 12.5mils. We were shooting a FN SPR with 24 inch barrel and SDN6. So velocity is good. We didn't write dope down so it was a bit of a cluster ****. We were slamming rounds for 2.5 hrs straight.

    Taking Chrono next with quality data. And I won't fork up and leave my Lapua 308 ammo. I was messing around with a few .22's. Same story there, ammo matters. Eley Tenex shot holes in holes. Annie 1416HD
    You and Mark are awesome. Thank you for the update and keep the info coming.
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  10. #100
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    Picked up 100 of the 77gr TMKs. I think I'll try them along side the 69gr TMKs. I'd like to try both on coyotes, but despite searching, I haven't seen results from anyone else on coyotes yet. I only ever get to shoots to 450, so there might not be much gained by going from 69gr to 77gr.

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