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John MH

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Posts posted by John MH

  1. 1 hour ago, Mat said:

    When has that ever stopped anyone buying an AI or PRS rig? 

    Never, but to post 'I bought or am having built A, B, C or D for W, X, Y, or Z' with no intension of ever doing or taking part in W, X, Y or Z is a very common trait.

    Do you actually do and take part in all all of what you suggest in your profile?

    If you do that's great, but many whilst 'interested' in their profile (not just here but also on Facebook etc) they don't actually follow it up in anything other than in their imagination.

    To wish and imagine is great but then to profess 'knowledge', based on imagined experience or expertise should be taken with a pinch of salt.

  2. 5 minutes ago, Catch-22 said:

    Why not get a Magnetospeed? The accuracy and repeatability is almost on par with the Labradar according to Litz.

    Super easy to use and won’t affect barrel harmonics when used with the MK picatinny mount.

    Had a US Spec Labradar but now use a V3 Magnetospeed and MK Mount.

  3. Well if you want to be really specific its best to try several sized cases as each will probably be slightly different (more or less spring back even if annealed) and opt for the average but we are probably talking less than 0.001" here and the ability to consitently and accurately measure that difference starts to get difficult.

  4. 17 minutes ago, Catch-22 said:

    Simples really.

    Take your bolt out, remove the firing pin/striker and remove the ejector too. It’s fine to keep the extractor claw.

    Screw your F/L die into your press until it contacts your shell holder. Now back the die out a couple of turns, so it won’t fully size all of the case back down to SAMMI spec as that’s too much.

    Now insert your bolt (minus the firing pin/striker and ejector you removed) and the handle should just flop down without any resistance.

    Take a piece of fired brass, lube it, place in press and size it. Remove brass, wipe lube off and place brass into your rifle’s chamber and gently close the bolt. If the bolt doesn’t fully close, or it closes with some force/resistance, the brass needs to be sized down further.

    Extract brass, lube and place in press. Turn die DOWN (so sizing the brass more) just a tad (0.01 or 0.02). Size the brass again. Now try it again in your chamber.

    Repeat just until your bolt will flop down like it did with no brass. This tell you that you’ve bumped your shoulder back just enough so the brass has minimal clearance but is guaranteed to chamber freely so you don’t get chambering issues. It’s also been sized just a minimal amount, no where near SAMMI spec. Use your calipers and Hornady headspace gauge to record the optimum headspace bump value.

    Ive found this to be the most accurate way of measuring my chamber headspace and minimum case bump required.

    There was an excellent and simple vid from Aron Wheeler (gunsmith) showing it all but I cannot find it on YouTube sadly.

    This is very true.

  5. 47 minutes ago, Re-Pete said:

    I really can't see any increased risk to myself or anyone else if I drive from a tier 2 to Bisley, shoot alone for a couple of hours, then drive back.

    Question you need to ask yourself is, is it wise to dos so?

    I personally don't think it is 'wise', think of all the unexpected things that could happen that could bring you into contact with someone in a Tier 4 area who could unintentionally infect you with Covid-19 and that you then take that infection back home with you. Not the actions of a 'wise' man.

     

  6. 1 hour ago, Catch-22 said:

    Yeah, I think with the ITAR changes, muzzle brakes are no longer handled by ITAR but controlled by Department for Commerce and can be more freely/easily exported under EAR99.

    Obviously no issue U.K. side as it’s a non licensable component.

    Not sure if all US firms either know this or have adapted to the change, but Area419 is one that has. 

    Thanks.

  7. 11 hours ago, ds1 said:

    Annealing, I think most competitive  shooters now do it but didn’t  Brian Litz say that there was no evidence for it showing accuracy improvements. 

    There is empirical evidence to suggest thats not quite true these days.

  8. I use one of these, and have several sets of pin gauges to set the neck tension.

    image.thumb.jpeg.322275a451018987cdfcea68bbe73b72.jpegimage.thumb.jpeg.1ed010fcd49262c04a628e312aab76f9.jpeg

    This is a photo of a mandrel die for controlling neck tension during preparation of match-level brass. This idea is that you can get very small, as well as consistent incremental changes in the diameter of the brass at the neck, therefore controlling neck tension.
    The die body with nut is not caliber specific. It can be used on cases as short as the 6BR through the Remington Ultra Mag. With careful setup it can even be used for the .338 lapua case. It uses precision collets that are commonly used to hold milling cutters and drills in the machining industry.
    You generally you need 1 collet per caliber but some sizes will work for multiple calibers. The common collet size ranges are;
    6mm - .197" to .236"
    7mm - .236" to .276"
    8mm - .276" to .315
    Mandrel pins are made from 2 " long precision hardened steel pin gauges. One end of the pin is tapered and polished. They are available in .0005" increments, and can be had in either "PLUS" (+.0002"/-0) or "MINUS" (-.0002"/+0) tolerance. 
     
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