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meles meles

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Everything posted by meles meles

  1. Could you do some for square bullets, like the Pope authorised for shooting at heathens ?
  2. meles meles

    What are the ESSENTIALS YOU REQUIRE WHILE CAMPING?

    More beer
  3. meles meles

    Couldn't resist.

    How many pennies, dare we ask ?
  4. meles meles

    FCSA Update

    Sadly, ooman, we think that if he isn't your local MP he isn't allowed to take action on your behalf. You'd have to write to your own MP, and ask him to bring it to the attention of the aforesaid MP. MPs can't ignore a letter from a constituent that specifically asks them to act but they can ignore general whines. Parliament has some funny rules...
  5. meles meles

    Wanted old steel cased 7.62x39

    We have lots, 7.62x39 and 7.62x54R. We'd estimate several hundred and increasing often...
  6. Big Al, (and others) Re your comment " Think about this logically, how would you test for the maker of the most accurate barrels in a way that was scientifically acceptable and thoroughly conclusive?", do you have a suggestion ? We ask because we're thinking of setting such an assignment as a Master's project in metallurgy and have started drafting the outline of the hypothesis we'll challenge students to test. All constructive input would be welcomed.
  7. Actually, it doesn't. Wiki tells you a lot about the applications it is used for, making wondrous claims for the process, but doesn't correctly explain how it works - or frequently doesn't work. Apply critical minds, oomans, to aught you read on t'interweb. (That includes our spiel too. You don't have to believe us.)
  8. Cryo is a heat treatment, it simply means that you lower the temperature rather than raise it. Phase changes will occur, metallurgical transformations and volume changes will still ensue.
  9. To an extent, yes. To fully relieve the stresses the barrels would have to be annealed and that's not something you want to do to gun barrels. Makes them a little soft... A conventional stress relief takes place at a much lower temperature and for a shorter time. It will remove most of the stresses in the barrels and again, that might not be a great thing. They could end up less than straight depending upon how they were made in the first place and then subsequently machined... Please bear in mind though that most of what we are talking about in this thread only matters if you are a superb shot and really can get the best from your equipment. Most of us can't. Any decent factory made gun, let alone one from the several truly great gunsmiths that frequent these pages, will be more than adequate for mere mortals. If the likes of baldie or bradders were to offer us a fluted gun with a button rifled barrel, free, gratis and for nowt, we'd snatch their paws off !
  10. Yes, plenty of good scientific evidence, some of it even in the public domain. Consider the L30 CHARM rifle on a Challenger tank. It's a big, heavy barrel that needs to be stabilised so it can fire accurately on the move. That requires the barrel to be have the least weight possible such that the servos and actuators in the stabilisation system have a chance of keeping it on target. An ideal candidate if ever there was one for fluting. Unfortunately, when a fluted barrel was trialled it had very poor accuracy. The machining of the flutes in a barrel changes the stress pattern within it, and those stresses will be changed asymmetrically too. Thus, as the barrel warms and cools (and that can be due to having the sun on one side and the other in shadow, never mind the effects of firing a round !), it will bend slightly. That is why the Challenger tank has an unfluted barrel, with a thermal sleeve over it to maintain as even a temperature as possible, and a muzzle reference system that uses a laser to measure the amount of bend in any case and let the gunner know where the muzzle is really pointing. Moving down in scale, a trial was conducted on small arms. You know, just to see if "the barrel knows it is under stress" 😏 A laser mounted (rigidly) to the receiver of a rifle and a second to the barrel, equally rigidly. Both collimated to converge at the same spot. Place aforesaid rifle in sunlight for an hour. Both laser dots now no longer concentric. The sun heats up the side of the barrel exposed to it and so that side of the barrel expands by a small amount. However, the 'warm' side of the barrel is constrained by the 'cold' side of the barrel and that doesn't expand as much. The barrel therefore curves a little. It's no longer pointing to the same place it did when it was zeroed. Repeat the experiment with a fluted barrel. The effect was greater. Those trials data were made available to the manufacturer of a premium grade sniper rifle. That manufacturer no longer offers fluted barrels. For most shooters, the above is irrelevant. Your rifle barrel will be capable of shooting with greater accuracy than you can utilise. Bradders summed it up quite eloquently: "a good shooter will always shoot better with a mediocre barrel than a mediocre shooter will do with a good barrel......and there's a lot of mediocre shooters out there..but there aren't that many mediocre barrels."
  11. Machining isn't stress free, ooman. Cutting a groove will produce different stresses than those made by a button. Which is the better process depends upon many things and there isn't s specific right or wrong answer. Most would assert that cut rifling is the pinnacle of rifling technologies but .... Consider the button process for a moment. An oversize carbide button is pulled through an slightly undersize bore, forcing it to take up a new shape. That will certainly leave stresses in the barrel. However, those stresses will be putting the surface of the bore into compression which can be quite a nice situation to be in when you then pressurise the barrel to, say, 55,00 psi. Before any crack can open up and try to blow the barrel apart it has to overcome that residual compressive stress... In addition, the action of the button as it passes through the bore will have tendency to deform each individual grain of steel in the vicinity of each grain boundary and partially close up exposed grain boundaries. That gives a smaller surface area of grain boundaries for those supersonic, 2,000 degree plus, erosive / corrosive propellant gases to work on. In practical terms, a well made barrel from a recognised maker will almost always be capable of better performance than the user, irrespective of the rifling technique. If money were no object, and we were a good enough shot to justify the cost, we'd have our barrels made from a PH grade stainless steel by cold flow forming and then clean them once in a blue moon.
  12. Us 'umble metallurgists would tend to back 'im up !
  13. With modern manufacturing techniques and quality control, oomans, all barrels should be good and entirely capable of sub minute accuracy. Each production method has its own theoretical advantages and disadvantages but the governing factor is now likely to be how it is used. If you take two identical barrels and shoot them differently you'll probably get very different results. For example, a barrel shot once a day during a hunt will behave differently to a barrel shot every 20 or 30 seconds for an hour during target shooting. How, and with what you clean it, if at all, will also give rise to differences. Our advice is to ignore the manufacturing technique, find a barrel that shoots well for your needs and enjoy it. We're contemplating setting a MSc task for the metallurgy students at the Badgerkadamy to study this, or that other old chestnut, "breaking in a barrel" next semester...
  14. meles meles

    Fauda

    Detectorists ?
  15. meles meles

    Small vs Large primer test: Rifleshooter.com

    Food for thought, but we're sure Laurie will be along shortly to offer some insight into whether this is a valid observation and if so, why .
  16. meles meles

    Recommend a: Digital Powder Dispenser

    We use a Lyman Gen 6, allow it to stabilise for 30 minutes afore we use it (time which can be well spent double checking our load data and brass) then crack on. No faults so far in about 2 years of use...
  17. meles meles

    Northern Shooting Show at Harrogate.

    It's a little smaller than the British Shooting Show, but very much focused on shooting rather than more generic associated pursuits. No stands selling dogfood, cuckoo clocks or tartan blankets. It occupied 4 halls but the organiser chose to space the stands out and use wide aisles and so it was actually easy get around and see stuff without being crushed. A very pleasant experience for visitor and exhibitor alike in our view. Highlights to us were: 1. Seven police forces present on site and issuing on the spot variations. If you saw something snazzy, you could go get a variation and buy it there and then. 2. Very focussed on shooting rather than generic country activity 3. Opportunities to try shooting on the site: clay pigeons, air rifles, firearms All in all, an excellent show and growing every year.
  18. meles meles

    Amazing group!

    Maybe it was a zombie badger on his way to a shoot... What car was he drivin' ?
  19. meles meles

    Northern Shooting Show at Harrogate.

    Oh indeedy ! We were there on a stand too and think it's developing into a great show ! Saw some crackin' kit from Devon Custom Rifles amongst others...
  20. meles meles

    Amazing group!

    Ah Ah, in that case we'll need a Krumlauf rifle then...
  21. meles meles

    Amazing group!

    Gun Pimp: we'd love to shoot at Diggle ! It could be bad for your health though: you might die laughing at our groups !
  22. meles meles

    Amazing group!

    We clearly stated that we couldn't do better, and tried to make it clear that we weren't denigrating the shooter. We merely observed that there was still scope to gild that particular lily. A problem with t'interweb is that it doesn't convey a wry smile very well, even when we adds of them ikkle emoticon thingies to our post.
  23. meles meles

    Amazing group!

    Oh we appreciates the skill involved in getting such a precise group, from the gunsmith that made it all the way through to the person that squeezed the trigger. It's a better group than we have ever managed, or are likely to. It's just that to us, hitting what we are shooting at matters too. It reminds us of another image that went around a while ago - a nice tiny group in the kill zone of a hostage and not a shot on the assailant in a police type training target.
  24. meles meles

    Amazing group!

    Ah, we sees. Best to miss the target precisely than hit it accurately ?
  25. meles meles

    Amazing group!

    Precise, but not accurate...
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