168 Barnes lrx in a 9.5 twist?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by .284, Jun 14, 2012.

  1. .284

    .284 Well-Known Member

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    I'd like to know if anyone has shot the Barnes 7mm lrx 168 grain bullet in a 9.5 twist barrel. Barnes calls for a 9 twist. I'm gonna find out on my own anyways it's just gonna be a while before the rifle shows up. Its been a while since I have shot a factory rifle but I convinced myself that I should give the new kimber 84L montanna a try. It's around 5lb 10 oz in a 280 AI. It's pretty hard to get a custom down to that weight never mind at about 1400$.
     
  2. Black Sheep

    Black Sheep Well-Known Member

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    Almost. I have a Remington Sendero in 7stw, believe its a 9.25 twist. Barnes told me the same thing, 1 in 9 twist above 5000ft, and a 9.25 won't stabilize it. Weather hasn't been good here to sight in the new scope/do load development (10-20 mph winds on my days off!!!) I have 20 rounds with this loaded up waiting for the weather to clear.
     

  3. trebark

    trebark Well-Known Member

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    9.5 twist in a 7mm? what do they expect you to shoot in that rifle...150grain bullets? You might have some trouble stabilizing the 168 Barnes as they are even longer than 'regular' bullets.

    Consider the 168VLD as a good alternative.
     
  4. .284

    .284 Well-Known Member

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    It was the stabilization I was wondering about. This is going to be a sheep rifle so Bergers are out of the question because I don't want a big hole in my cape and I also don't trust them when hiking through bear country.
     
  5. bpwsm

    bpwsm Member

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    I'm off to the range this morning to test the 168 grn. LRX's in my 7 rem. mag with it's std 1:9.5 twist.I got google eyed when I saw these bullets and ordered b4 I did any REAL research.
    I think Barnes my have jumped the gun a little by releasing this w/o any accurate load data. They told me to use their 175 grn TSX load data. But things don't really add up.

    This bullet is long! Much longer than the 175 TSX and I'm alittle concerned about the 3.24 seating callout seems a little deep in the case for this long sucker. Also shows a 1:9.5 twist for the 175.

    I used the Sierra/Berger load data for their 168 respective bullets as a starting point and played with seating and charge from there.

    I'll let you know what I find later today!gun) and would welcome anyone elses comment as well!!

    Bill
     
  6. .284

    .284 Well-Known Member

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    Thanks Bill, hopefully they work out for you. I'm interested to see how things turn out.
     
  7. bpwsm

    bpwsm Member

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    AH...back from the range and having a beer!.Started to get hot and is now 96*. I had some very interesting results with the following loads that can be verified by my shooting partner and various bystanders.

    I started the day with a 62grn load of IMR 4831 and coal of 3.25 as Barnes Bullets seem to like a little "jump". This load produced a 1st shot of 2995 2nd @2955 3rd@2975 ......Impressive velocity considering Sierra lists a max of 62.2@ 2900fps for the 168grn Matchking. The group was not acceptable but the muzzle velocity was.....And we're not done!

    The loads were then bumped to 62.5 grns (IMR 4831) coal of 3.25. Velocities went to 3031,3029 and 3015. the groups were better but right @ 1".......Still chasing!

    Next was the same powder charge (62.5) but seating depth was moved to 3.26. Velocities were very much the same but the groups did come in a bit.

    I then moved to what I'd consider a HOT load based on various load manuals. I went to 63 grns. of IMR 4831 with the OAL set to 3.28. This produced verified velocities @ 3298.....3318......3336 and the groups were acceptable???@ just under an inch with a 168 grn bullet.

    Yeh I know!!!!!!!....But I think that with the length and design of this bullet (3 bands etc.) combined with seating it out a bit farther produced these velocities. An anomaly??? I can't say for sure. But there were absolutely NO pressure signs that we could see. I will have our very reputable gunsmith give a non-informed visual just to be certain! Ialso could not visibly see any indication of "tumbling" clean holes straight away! I could only test @ 100mtrs. as the 200mtr. was under repair so I'm not sure if the bullet had enough distance vs velocity to truly characterize stabalization.

    To verify that the crono was working properly I fired some factory Barnes Vortex 150grn. ammo that came out to be right @ 2800 fps..and is listed to be@3060 also Winchester Supreme 150 grn. btips just above 2900 ..apples to apples.I also had rounds of 168 grn Gamekings loaded to 62.5 4831 and set to Sierras book oal that produced 2950ish but was a little sticky on the bolt throw.My partner also commented on the extra blowback.

    This test was performed using a Weatherby Vangard semi custom with a B&C Medalist stock (bedded),Timny trigger set@ 2.5lbs and a Crony.....Crony!

    AND of course I don't condone the use of this load data for any other use than in MY rifle!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Friggan Liberals!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! gun) :D

    IF you have ANY positive or negative comments PLEASE reply! this is a work in progress....The more input the better!

    More beer! and Happy Father's Day!
    Bill
     
  8. .284

    .284 Well-Known Member

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    Sounds like they are stabilizing at those velocities as I believe that bullets become more stable the further out they go. Thanks for posting up the results
     
  9. gunner69

    gunner69 Well-Known Member

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    I love the LRX bullet. Hit this mule deer at 287 yards with a 175 gr LRX out of a Lazzeroni Patriot. The deer was down and dead before I could find it in my scope after pulling the trigger. Never moved. I believe my barrel is a 1:12 on that rifle but it is a .30 cal bullet. The .284's are longer and skinnier so I could see how you would need a tighter twist. I have a .284 Win that I am going to try the 168 gr LRX in. It is a 1:9 twist. That gun is dialed in for 180 Berger VLDs but with the impressive performance of the LRX I am going to work up a load with R17 and hopefully take it on a Colorado Elk hunt I have scheduled in October. I'll try to update you on my findings.
     

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  10. barnesuser28

    barnesuser28 Well-Known Member

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    nice mulie! where did you take him? it looks kinda like the ND badlands. glad to here that the lrx are working for you!
     
  11. gunner69

    gunner69 Well-Known Member

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    close. north of Miles City MT.
     
  12. Black Sheep

    Black Sheep Well-Known Member

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    Well, I finally got a good enough day to go out! Hit the range early (830) to avoid the inevitable wind at 10, and the heat! It was only about 80 at the range, and about 85 or so when I left. Anyway, here's the 168 LRX info
    Sendero 7mm STW. New/prepped remington brass, 9 1/2M primers, retumbo. Loaded to mag length 3.650 overall
    Started low because I couldn't find very much reliable info for retumbo in an STW..... first several rounds were sighting in the scope, as this combo is new to me. Rough sighted in 3 rounds!!!!!
    76.5 grains-avg 2992.9 ES 23.5
    77.0 grains-avg 2989 ES 14.5
    77.5 grains-avg 3021.2 ES 11.4
    WTF is up with the drop in velocity on the 77grain string? Consistency was okay, these three produced about 1 inch groups at 100yds. 77.5 grain string had first and third shots almost touching, and second one flew about 3/4 inch. Love the low ES, but I'm not counting on these results alot as the brass hasn't been fireformed yet. My next groupings will be 78, 78.5, 79, 79.5, 80, and 80.5. on my next days off if the wind will cooperate!
    Reloadersnest shows an unverified load of 82 grains of Retumbo behind a 160 grain TSX at 3306fps. So I am kindof using that as the neighborhood of where I am hoping to be at. I'll keep an eye out for pressure signs at 80 and above.
     
  13. coyotezapper

    coyotezapper Well-Known Member

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    Its the other way around. The higher in elevation you go the less need for a faster twist you will have. Above 5000' a 1-9.25 will be fine. My Rem700 STW shoots 180 Bergers and 168 LRX just fine at 5600'. Both are sub MOA.
     
  14. barnesuser28

    barnesuser28 Well-Known Member

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    gunner69, how did your elk hunt go? I am also building a 284 win to shoot these bullets, it will be a lightweight deer/antelope and elk rifle.

    Riley