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  1. #11
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    Well, I've got some Rem and PRVI brass, the dies, some 7.62x54R bullets, primers and powder, guess I've gotta roll me own.

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    Legacy Member AKA Hugh Uno's Avatar
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    Quote Originally Posted by rondog View Post
    Well, I've got some Rem and PRVI brass, the dies, some 7.62x54R bullets, primers and powder, guess I've gotta roll me own.
    try IMR 4895 to start, TENDS to be the most accurate powder esp. with the lighter 54R bullets, but if I had only one powder for .303, it would be 4895.

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    Excuse my ignorance here, but I was under the impression that "Z" suffix ammunition was specifically earmarked NOT to be used in rifles, only in machine guns. Something to do with the powder load IIRC.

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    I don't think this correct

    Quote Originally Posted by FugWit2 View Post
    Excuse my ignorance here, but I was under the impression that "Z" suffix ammunition was specifically earmarked NOT to be used in rifles, only in machine guns. Something to do with the powder load IIRC.
    I recall this was Defense Industry Canadaicon, Z = Nitro Powder (i.e. NOT cordite). Loaded to (essentially) the same pressure/velocity as any other surplus. I suspect the only made for "machine gun" use ammo is linked with tracers or incendiary (which would still be safe in the bolt rifle).

    bottom line, unless it is a PROOF round, if it is .303 and your rifle is in good condition, you CAN SHOOT IT (albeit. much is BOTH corrosive and cordite)
    Last edited by AKA Hugh Uno; 11-23-2009 at 06:39 PM.

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    As stated earlier looking for Greek HXP ammunition is like looking for a pot of gold at the end of the rainbow.

    Save your energy and buy Prvi Partizan cases they are larger in diameter in the base web area than ANY other brand of .303 Britishicon case made. They are also .010 thicker in the base web area and are made to military standards or some of you might remember made like Lake City Match grade cases.

    Fire form your cases using the rubber o-ring method around the base of the case as this eliminates any and all excess headspace or head gap clearance. The o-ring also centers the case in the chamber when compressed and promotes equal case expansion and prevents the case from stretching in the web area on the first firing.





    Guess which case is larger and thicker in the base web area?






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    Legacy Member limpetmine's Avatar
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    Iirc

    Not so much with the powder, but the bullet. The Z load used a boat tailed bullet, which gave longer range for long range area firing by MG's. The boat tail in a rifle allowed excessive erosion in the bore/chamber throat area. I'm sure someone will correct, but that was my understanding.

    Quote Originally Posted by FugWit2 View Post
    Excuse my ignorance here, but I was under the impression that "Z" suffix ammunition was specifically earmarked NOT to be used in rifles, only in machine guns. Something to do with the powder load IIRC.

  9. #17
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    That would be MkVIII w/ the boat tail bullet. "Z" refers to the type of powder.

    ETA Don't immediately find a Milsurps article on 303 ammo types. Am I missing something AGAIN?
    Last edited by jmoore; 11-24-2009 at 02:52 AM.

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    Legacy Member Alan de Enfield's Avatar
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    From Army Ordnance Service book :

    "Small Arms Ammunition" 24th February 1945

    Ball Mk7 36.5 gr Cordite
    Ball Mk7Z 37 gr N.C
    Weight 174gr. Envelope of cupro-nickel gilding metal, or, gilding metal coated steel. lead/Antimony core. Aluminium or paper tipped, flat based, seured by coning and indenting. Strawboard wad in Mk7


    Ball Mk8Z
    Weight 174gr. Envelope of cupro-nickel gilding metal, or, gilding metal coated steel. lead/Antimony core. No tip, streamlined, flat fronted cannelure secured by coning


    'Streamlined' refered to in the Mk8Z is what we now call 'boat-tail'

    The book goes into great detail about what ammunition can be used in what firearm but basically Mk7, Mk7Z or Mk8Z can be used in Rifles but Mk7 or Mk7Z MUST NOT be used in machine guns, if a machine gun has been used with any Mk7 the barrel must be stamped with a number 7 and immediately returned to the armourer for replacement.
    A few rounds of Mk7 destroys the accuracy of machine gun barrels.

    Not stated in the 'book' but from various quotes - the Mk8Z does allow gasses to increase erosion by allowing them to escape around the bullet in worn barrels.

    I have found that smaller bullets (ie 150gr) do not perform as well as 174 gr as there appears to be less bullet for the rifling to 'grip'. I'm making an assumption here but with a boat tail it would be similar to a smaller bullet and accuracy may be affected. - Just my thoughts.
    Last edited by Alan de Enfield; 11-24-2009 at 04:56 AM. Reason: smaller bullets.

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  12. #19
    Advisory Panel Thunderbox's Avatar
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    Quote Originally Posted by Alan de Enfield View Post

    Not stated in the 'book' but from various quotes - the Mk8Z does allow gasses to increase erosion by allowing them to escape around the bullet in worn barrels.

    I'd like to see someone demonstrate how that theory was observed and measured: even the Britishicon arsenals - after tens of millions of rounds expended in testing & development - never listed any such evidence or supposition.

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    Legacy Member Alan de Enfield's Avatar
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    Quote Originally Posted by Thunderbox View Post
    I'd like to see someone demonstrate how that theory was observed and measured: even the Britishicon arsenals - after tens of millions of rounds expended in testing & development - never listed any such evidence or supposition.
    Exactly my point - heresay easily becomes fact when the internet allows global interaction.

    I can understand the theory that shorter (lighter) bullets will have less 'grip' or contact in the barrel and may have less accuracy but the 'escaping gas' and erosion theory eludes me - certainly when we look at the number of rounds we'll fire

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