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Thread: .243 Ruger American, 1/9 twist, 22" barrel, suitable bullet weights?

  1. #1

    .243 Ruger American, 1/9 twist, 22" barrel, suitable bullet weights?

    Afternoon SD its been a while...

    Can anyone advise as I currently shoot a Ruger American .243 (22" barrel and 1/9 twist) and use Honrady SST 95 grain, I'm considering a change to a slightly heavier bullet weight (100 or 105g) so I can happily shoot Roe, Red or Sika without having to change my ammunition and zero my scope in as certain shoots (BASC Isle or Arran etc) require a minimum of 100g.

    What are the limits or acceptable range of bullet weights for my setup and does anyone have any recommendations of suitable factory loaded ammunition?


  2. #2
    Twist/Stability is more related to bullet length than weight but I would think that 1-9 would stabilize 105's. All Hodgdon's data was derived with a 1-10" twist up to 107 grains. Hornady recommends 1-9" twist for their 105 grn A-Max and Match HP bullets which are pretty long: You should be good to go with a 1-9" twist. How do you like the American? ~Muir

  3. #3
    Hi Chris,

    Give a box of 105gn GECO (RWS) ammo a go. It worked fine in my Tikka 590 243 on red deer (stags and hinds) and was amongst the cheapest factory ammo at that time.

    I noticed in another thread that Bushwear in Perth might have some, clearly you'll need to go by boat at the minute.................

    Best of luck,


  4. #4
    Ha funny you should mention the Geco 105's Haggis Hunter as somebody recommended them to me, which sparked off my interest in changing my ammo to the heavier grain bullet, ive been quoted 115 for 100 which is no too bad. I'll contact bushwear and see what there asking for them.

    Muir thanks for the advice, I'm quite liking the American the more I use it, particularly its weight and simple layout, no frills just does the job, I got the trigger pull reduced to around 3.5 lbs and i've been happy with it since.

    Last edited by Chris Baker; 05-12-2015 at 16:30.

  5. #5
    It uses a flat-base bullet which has the effect of reducing the bullet's overall length (and therefore the necessary rotational speed for full gyroscopic stability) compared to an equivalent boat-tail design, and also FB bullets don't need as much spin anyway as BT types even when everything else is the same. Berger quotes special twist rates for its few flat-base 6mm models, the rule of thumb being a full 1 in 1-inch slower pitch needed than the same length boat-tail design.

    So 1 in 9 will likely be ideal for this particular model, and there are magazine reviews around (Google the cartridge and you'll find a couple of archived copies available free) at least one of which obtained satisfactory results in a standard 1-10" twist rate barrel.

    If it'd been any of the 105gn HPBT match or Berger Hunting VLD models, that would change things - most need an 8-inch rate optimally given their considerable length and 9-inch would either produce unstable results, or so marginally stabilised that performance would be poor.

  6. #6
    Quote Originally Posted by Chris Baker View Post

    Muir thanks for the advice, I'm quite liking the American the more I use it, particularly its weight and simple layout, no frills just does the job, I got the trigger pull reduced to around 3.5 lbs and i've been happy with it since.

    Timney, man! Timney! I put one on my 300 Blackout Ranch Rifle and love it. It completed the project.~Muir
    PS: There are some on line articles about reducing the trigger pull.

  7. #7
    Most .243 Win rifles are 1:10, but most 6mm Remington ( .244 Remington / 6x57mm ) are 1:9, 1:9.25, around there. I had a Browning B-78 in it, and it shot 100-gr and 105-gr ammo into tiny groups ( mostly what came with the rifle. I sold it to a friend fairly soon.)

  8. #8
    My 1:10" .243 will shoot 100gn SP beautifully, but 105gn vlds go sideways at 60m. A 1:9" MAY stabilise a hunting projectile but it'll be touch and go for the match VLDs.

  9. #9
    SD Regular
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    East Midlands M1/M69 Junction 21
    As MUIR correctly says it isn't weight, per se, but length. OK length is obviously longer with heavier bullets but then you get the "exotocs" where they are in fact longer than their weight would suggest. And also the round nose type .243"/6mm bullet where their length is shorter than their weight would suggest.

    LAURIE's response interests me..

    Do they, I don't know so that's why I ask, because they have a shorter surface in contact with the bore stabilise as if they were a shorter the flat base round nose type seem to do? Certainly I never tried them so don't know.

    Attachment 64115

    I had a Parker-Hale in 6mm Remington and that would not shoot at all with Nosler Partition 100 grains and not very well, either, with Remington Core Lokt Ultra Bonded 100 grains. What I never tried and perhaps others will help is boat tail pointed soft point 100 grain bullets in 100 grain.

    But what I do predict...I spoke to someone at BASC and hey appeared that mandatory non-lead bullets will (for deer where 100 grain is required) effectively render most .243"/6mm rifles unusable...

  10. #10
    As long as the bullet doesn't lose contact with the rifling (stripping) it's bearing length won't be of consequence. When driven at like speeds, bullets will rotate a the same rate: It has no choice. It can rotate neither faster nor slower while traveling down the barrel. How well it is stabilized once it leaves the barrel is another story.~Muir

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