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  1. #1
    Caretaker
    Join Date
    Dec 2011
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    Hawkes Bay
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    9,523
    Quote Originally Posted by vulcannz View Post
    Similar on the Rossi, seems to like the Horny 17gr vmax.
    Your ammo that’s not concentric, ie bent, not assembled straight , will be the source of the random fliers

    This problem surfaced in 2005 when the 504T was released , yes 20 years ago

    They are still making 17hmr ammo today that gives you a giggle when rolled on a concentricity gauge, it’s the reason most went on to use a 223

    The neck tension required to hold the projectile is ridiculously high and crimps the projectile, damaging it, and is also the reason they can’t anneal the necks, which results in split necks and causes velocity variations

    The rifles are accurate, the ammo not so much
    Last edited by 7mmsaum; 03-04-2025 at 09:34 PM.
    A big fast bullet beats a little fast bullet every time

  2. #2
    Member
    Join Date
    Nov 2012
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    BOP
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    21,374
    Quote Originally Posted by 7mmsaum View Post
    Your ammo that’s not concentric, ie bent, not assembled straight , will be the source of the random fliers

    This problem surfaced in 2005 when the 504T was released , yes 20 years ago

    They are still making 17hmr ammo today that gives you a giggle when rolled on a concentricity gauge, it’s the reason most went on to use a 223

    The neck tension required to hold the projectile is ridiculously high and crimps the projectile, damaging it, and is also the reason they can’t anneal the necks, which results in split necks and causes velocity variations

    The rifles are accurate, the ammo not so much
    Moving to a 223 with factory ammo would be a worse problem. My 17 would group an 1” at 100, I have deleted all the targets from my photos so cannot prove. A 12 gauge hull is good at 100.
    Old ammo can be a problem, I always listen to the shot as I’ve had a couple fizz and leave the projectile in the barrel, split necks are common.
    Just remembered I owned a 4th, it was Sako, but not made by Sako, didn’t own it long
    Boom, cough,cough,cough

 

 

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