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Thread: .257 Roberts suprise

  1. #1
    Boolit Master



    atr's Avatar
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    .257 Roberts suprise

    when out this morning an shot my 257 Roberts model 722
    using J's ...
    same load / powder / primers / cases
    bullets were different....120Gr Speer....120 Gr Nosler partition

    the Nosler consistently shot 2-1/2" higher then the Speer.

    I was surprised at that amount of difference given same them loading.

    THE RANGE WAS 100 YDS
    THE WINDAGE FOR BOTH WAS EXACTLY THE SAME. THE ELEVATION WAS THE ONLY DIFFERENCE
    Last edited by atr; 09-16-2021 at 10:25 AM.
    Death to every foe and traitor and hurrah, my boys, for freedom !

  2. #2
    Boolit Master
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    Wow! What range?

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  3. #3
    Boolit Master


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    Maybe the amount of bearing surface is different ?
    I HATE auto-correct

    Happiness is a Warm GUN & more ammo to shoot in it.

    My Experience and My Opinion, are just that, Mine.

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  4. #4
    Boolit Grand Master
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    Higher's not so bad, to the side really makes holding off odd.

    Robert

  5. #5
    Boolit Grand Master tazman's Avatar
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    I had a 243 in a Savage 110 that shot good groups at 100 yards with 90 and 100 grain bullets.
    I tried some Nosler 55 grain spire points. These shot really high velocity and a bughole group at 100 yards. Really impressive. The only problem was, the group was 6 inches to the left of the others.

  6. #6
    Boolit Grand Master Texas by God's Avatar
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    2-1/2" difference of elevation for differently constructed bullets is not bad. Having a rifle that stays on a tennis ball at 100yds with different bullet weights makes it a keeper at my house.

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  7. #7
    Boolit Grand Master tazman's Avatar
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    Quote Originally Posted by Texas by God View Post
    2-1/2" difference of elevation for differently constructed bullets is not bad. Having a rifle that stays on a tennis ball at 100yds with different bullet weights makes it a keeper at my house.

    Sent from my SM-A716U using Tapatalk
    I only own one rifle that will do that.
    Most of mine are set up for one load and bullet size. Nothing else is fired in them other than to test.

  8. #8
    Boolit Master 444ttd's Avatar
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    Quote Originally Posted by tazman View Post
    Most of mine are set up for one load and bullet size. Nothing else is fired in them other than to test.
    me too.
    Ad Reipublicae his Civitatum Foederatarum Americae, ego sum fortis et libero. Ego autem non exieris ad impios communistarum socialismi. Ora imagines in vestri demented mentem, quod vos mos have misericordia, quia non.

    To the Republic of these United States of America, I am strong and free. I will never surrender to godless communist socialism. Pray to images in your demented mind, that you will have mercy, because i will not.

    MOLON LABE

  9. #9
    Boolit Grand Master Texas by God's Avatar
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    My wife's. 250 Savage has an ER Shaw 1-10" twist barrel full length bedded in a Fajen laminated stock. It will hold that tennis ball sized group with the 75 gr hp@3200 fps to the 120gr @2600fps. It's the only one we have that will do that. I've never shot a tiny group with it- but it is always on target when needed. My "keeper" has a keeper!

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  10. #10
    Boolit Grand Master FergusonTO35's Avatar
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    Interesting, my Howa 1500 has an ER Shaw 1:10 barrel in .257 Roberts. It really, really likes 117 grain Sierra Pro Hunters.
    Currently casting and loading: .32 Auto, .380 Auto, .38 Special, 9X19, .357 Magnum, .257 Roberts, 6.5 Creedmoor, .30 WCF, .308 WCF.

  11. #11
    Boolit Master nvbirdman's Avatar
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    The different impact is caused by the vibration of the barrel. If the barrel is at a high point when the bullet clears the muzzle the bullet will strike higher.

  12. #12
    Boolit Master
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    Quote Originally Posted by nvbirdman View Post
    The different impact is caused by the vibration of the barrel. If the barrel is at a high point when the bullet clears the muzzle the bullet will strike higher.
    Bingo!

    Three44s
    Quote Originally Posted by Bret4207

    “There is more to this than dumping lead in a hole.”

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BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
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