Sako 6mm PPC USA

Discussion in 'Sako Ammunition' started by colt45sa, Dec 13, 2016.

  1. colt45sa

    colt45sa Member

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    The dimensions on Sako brand 6mm PPC USA cartridges are slightly different from the Norma 6MM PPC cartridges. So far I've only reloaded and shot the Sako USA's. Is there anything that I have to do to the Normas besides full length sizing before I load them for firing??

     

  2. stonecreek

    stonecreek SCC Secretary Forum Owner SCC Board Member

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    The Sako 6mm PPC USA chamber has a neck dimensioned for brass which is of conventional thickness, not the "tight neck" found on many benchrest chambers. Sako brass has a neck of appropriate thickness for the Sako chamber. I'm not aware whether Norma 6mm PPC brass is made with a "pre-thinned" neck wall or if it is of conventional thickness. The head/body dimensions of either should be the same. Presumably, whether the Norma neck walls are thinner or not, the inside neck diameter should be the same as Sako brass once it is reduced by the sizing die then expanded to spec interior diameter by the expander ball.
     
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  3. colt45sa

    colt45sa Member

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    Thank you~!
     
  4. colt45sa

    colt45sa Member

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    I wasn't aware that the dimensional difference was only in the neck. Since custom 6mm PPC rifles are built with varying neck diameters making neck turning a requirement, I would expect the Norma brass to have an exterior neck diameter as thick or very nearly as thick as the Sako so the shooter of the custom rifle could turn it to his needed .265, .264, or .262. Naturally the inside diameter will be the same because the bullet is a 6mm as you stated.
    I have a 'one-hole all day every day' rifle with a .262 neck, and there-in lies the problem. I message all my brass ( .223 and .308 ) by weight, length, flash hole uniformity, but I don't neck turn, and I don't want to get turning down neck of my brass. Ergo, I bought the Sako~!
     
  5. stonecreek

    stonecreek SCC Secretary Forum Owner SCC Board Member

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    I can find anecdotal mention of differing brass between the "6mm PPC" and the "6mm PPC USA", but none of it seems based on dependable references. Mostly it seems to stem from people attempting to use Sako brass in non-standard custom chambers; or perhaps attempting to use once-fired brass from another rifle without having a proper FL resizing die. Even though some "gossipers" claim that Sako brass is somehow "larger in the base", all PPC brass is based on the 7.62x39 or .220 Russian cartridge, and all of the references show all of the bases as .443" to .445", well within the margin for conversion from the original metric dimensions.

    I don't have any Norma brass to measure, but I just put the caliper on some unfired Sako brass and it measures .444 at the rim and about .4405 on the body just in front of the extractor cut. I also measured some Federal 7.62x39 and some Lapua 7.62x39 and both were virtually identical to the Sako brass at .444/.441".

    Here is what Chuckhawk's article on the 6mm PPC USA had to say: Norma of Sweden and Sako of Finland supply 6mm PPC brass for handloaders, and Sako chambers rifles for the cartridge. The letters "USA" were added to the designation "6mm PPC" at the request of Louis Palmisano when Sako standardized the cartridge in 1985.

    By the way, if a cartridge chambers without resistance, then its neck is not too thick for the chamber. Many people think that if a bullet will not insert easily into the neck of a fired case then the neck is too thick. Not necessarily. All brass has springback. The neck springs back after firing a little, so if clearance is adequate but minimal, the springback may reduce the inside diameter of the case neck to a tad less than the diameter of a bullet. So, unless you feel detectable resistance to the bolt closing, the necks are okay. Of course, really tight benchrest chambers simply won't allow you to chamber a cartridge without a properly turned neck -- and if you forced it you would experience elevated pressures due to the extra resistance to dislodging the bullet from the case neck when the round is fired.
     
  6. colt45sa

    colt45sa Member

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    Thanks for that. Concise and understandable.
     
  7. colt45sa

    colt45sa Member

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    For those who own and shoot a Sako in 6mm PPC and are intent upon shooting as best as the rifle possibly can, please tell me what load you have found the most accurate. Give me the cartridge brand, primer brand, powder brand and weight of charge, bullet brand and weight.
    I just bought one to replace the Vixen Hunter I foolishly sold some back. This one may like a different diet that the last one. This is what I was able to accomplish with the one I sold,
    img003.jpg
     
  8. gowyo

    gowyo Sako Junkie

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    Howdy,

    Does anyone know what the OEM factory 6mm PPC USA 70 gr bthp sierras were loaded with? I pulled one, 22.5- 22.6 grains of short kernels extruded powder. VV120? VV130?

    Thanks.
     

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