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    Brno Fox / CZ 527 Barrel Shank Diameter?

    Thanks @gzig5 I've had a long searching session, and those are the figures which are coming up. it looks like the shank diameter is the same as a small ring mauser, which is good to know. my back of a cigarette packet conversion for thread pitch comes out at 20.32 TPI (don't trust my...
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    Brno Fox / CZ 527 Barrel Shank Diameter?

    Does anyone have a figure for the barrel shank diameter on a Brno Fox / CZ527 please? Many thanks:)
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    Greener Martini ShotGun

    Not wanting to hijack the thread, but I'd be very interested to see good close up photos of the Ottoman rimless extractor. (take a look at the "most popular posts" on the right hand bar of this blog for some interesting info on photogrammetry ATOR , not suggesting you go to those lengths...
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    Book with instructions on how to adjust magazines to feed?

    Thankyou for those leads:) Iooks like I might be investing
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    Greener Martini ShotGun

    Thanks for the heads up on the Turkish/Ottoman rimless extractor. I hadn't come across it.
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    Greener Martini ShotGun

    For some reason I thought I had replied here. Greener re bored the barrel threads in order to convert military martini actions into shotguns. The threads are therefore larger than the rifle threads In the process of the conversion, Greener altered the locking geometry, bringing the centreline...
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    Book with instructions on how to adjust magazines to feed?

    Going back about eight or ten years ago...:codger: There was mention on here of a gentleman who had privately published / distributed a book that included instructions for trouble shooting and adjusting feed lips and followers in bolt actions in order to get them to feed reliably. IIRC the...
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    .454 Casull Mauser deer rifle

    For a No1 SMLE or earlier action, I'll whole heartedly agree with you. The Indians had to uprate their steel spec to prevent their 7.62 No1 rifles stretching and developing excess headspace. a number 4 is slightly different. Many No4 actions were been re barreled for 7.62X51 / .308, and were...
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    .454 Casull Mauser deer rifle

    Aditional thought, For rimmed cases, you might like to experiment with a similar mag lip set up to those used in .22rf pistols, with a ramp cut out in the middle of the feed lips to lift the rim and case head up just as the bullet and case mouth are entering the chamber. Surplus .45 acp...
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    .454 Casull Mauser deer rifle

    A couple of thoughts for you IIRC the 45 Long Colt, that .454 Casull is based on, has the same diameter ahead of the rim as 6.5 x 55mm Scandinavian: .480" (compared to .470" for .308, .30-06 etc) Depending on how anal the bureaucrats are, you have a source of strong headed rimless .454 cases...
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    Copper .22 rim fire cartridges

    Some refs for dating The first ref for priming with lead styphnate is: US 1,443,328 granted to Herz in 1919. Synthesis of tetrazene US 1,859,529 Granted to Rathsburg 1928 Sensitizing styphnate priming compounds with tetrazene US 1,889,116 Herz and Rathsburg 1930 (English patent...
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    Copper .22 rim fire cartridges

    but they're almost certain to be corrosive primed.
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    Copper .22 rim fire cartridges

    one of the patents for styphnate priming compounds lists as an advantage, the compatibility with brass cases. increasing the content of zinc increases the work hardenability and tensile strength of cases, up to the limit of the solid solution at 30% zinc, 70% copper. The weakest link in a...
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    Does metal thickness correlate with maximum PSI pressure?

    Damn, in the old days, Bubba used household DIY tools to trash poor unsuspecting guns. Now, that young Cody Wilson has accidentally lead to Bubba believing that 3d printing means that Newtonian physics and materials science no longer limit his dreams coming true.
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    Bolt Body to Action Tolerance > Affect on accuracy?

    Have you read Vaughn, rifle accuracy facts? About the only way that bolt body to rcvr bore fit affects accuracy, is if the uplift of the rear of the bolt due to the pressure of the cocking piece on the sear, lifts the top lug off its seat. When you fire, the lug hitting the seat, adds to...
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    Brno ZKK 600 / CZ550 series, ring sizes and pos welding

    The metalwok has cleaned up far better than I ever dared to anticipate, and a try (striker removed) with a friend's 150gr starting load resulted in the bullet stuck in the throat, so there's plenty of throat left to play with. :cheers: got me an unexpected bargain that.\apart from a cleaned up...
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    Gun laws in Australia , England

    Was this thread meant to look at research, eg that the British firearms act of 1968 which served as the basis for similar acts in Australia, New Zealand and Canada was so perfect that it has been revised at an average frequency of once every 14 months between 1968 and present. and sharing the...
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    Does metal thickness correlate with maximum PSI pressure?

    There are several parts to answering the op's question. First the question itself, yes a thick walled cylinder can be designed that will resist those sorts of pressures. The resistance to failure of the inner surface of that cylinder depends upon the three dimensional relationship of the...
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    Brno ZKK 600 / CZ550 series, ring sizes and pos welding

    I think there was a quote from an old P O Ackley, close to the end of his life, when someone asked him about wildcats, his reply was: "save your money instead." I'll keep my eyes open for a tired, long action Remmington 700. At least it comes with a mag cut out that is long enough for H&H...
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    Brno ZKK 600 / CZ550 series, ring sizes and pos welding

    Thanks for the info. I've never actually had my hands on the mag length Brno/CZ action. They're way out of my price range. Would love to have one though. I've picked up an abused 06 length 600. The 06 length cases are out of fashion here, and tired rifles chambered for them are not good...
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