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Recent content by Davester

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    Gunsmithing True bore alignment system RPM?

    got a romi 510 and have run at 2000 without issue. the chuck is rated to 2500 and have on occasion run it up to that no prob either but that is too quick for most of the work i do.
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    Gunsmithing Polishing a stainless barrel

    That's what I did too, but ended up with a beast of wood lathe 1.5m in the z axis
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    Gunsmithing Cleaning external threads after cutting them

    I use a full thread form insert - never had to clean a thread yet
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    Gunsmithing ECR PTS 2500 rifling machine

    +/- 0.02mm is huge. My experience is that groove tolerance is often within the measurement error of the air gauge with this process
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    Gunsmithing Melonited Barrel

    That is correct
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    Gunsmithing Melonited Barrel

    meloniting aka salt bath nitriding can also be blotchy in places. We're looking into gas nitriding now which I believe doesn't have the aspect ratio issues salt bath nitriding does
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    AI AX308 Feeding 6br

    Thanks - I've tried the HRD kits in the AW, didn't work for me...
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    AI AX308 Feeding 6br

    Does anyone know if these mags will feed a 6mm br in an AI AW?
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    Gunsmithing Time to Update Rifling Methods?

    7" twist 6mm BR ECM Barrel test. Shot in less than ideal conditions with not the most ideal projectiles. Load was thrown together with 68gr Berger FBHPs - Ave: 3070, ES 41, SD 18.3. A really mild loading of old stock VV N135 - 28.9gr. Distance 100yds. Rain made the target wet and group looks...
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    Not a metallurgist but the short answer is "somewhere in the middle" in terms of durability I suspect. As with most things, a balance is sometimes needed to be struck. Also, it needs to be borne in mind that: Material grades allow for a range of composite materials, the same grade from...
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    416 does not have the right elasticity to be hammered. So when comparing processes, as most cut/buttoned barrels are made from 416, you are normally inadvertently comparing steels too. 4140 can be hammered, cut and buttoned and would be a much fairer comparison. However in Europe 51Crv4 (6150...
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    yes
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    I'm familiar with the EMAG machines, they do not rifle in "seconds". They increase production rates by having multiple spindles in the one machine but even then they do not approach any where near the speed you allude to. EMAG are not the only company with ECM rifling capacity, some have been...
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    Hypothesis is that hammering slightly increases the density of the material thereby increasing heat hardness and resistance to cracking. I'm unaware of any research on that though. ECM takes around 9 - 15 minutes dependant on barrel length, power supply and other parameters, pricing should not...
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    Gunsmithing A Question For The Hide’s Barrel Material Smiths/Experts

    416 is contra-indicated for the hammer forging process. However the process does increase the Rockwell C of the bore by, anecdotally, circa 5 - 9 points which at least infers greater durability. As for accuracy, it is recommended that hammered barrels should be stress relieved which would reduce...
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