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Popsbengo

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Everything posted by Popsbengo

  1. 19" is optimum in your fag packet calculation. According to the EXCEL calculator he gives some very different numbers to yours. I need to understand his calculation method - further reading. There may be something in this, but how well does QL actually model barrel time? There's an assumption in Long's method that QL is strongly correlated to what's really going on. Bore tolerances must add variance to this? I have QL but never used it for .22rimfire. I'll have a play.
  2. OK, my brain is hurting now 😁 I have a CZ455 16" and it shoots very well indeed but only RWS Rifle Match (330m/s 40gr). Absolutely hates Eley.
  3. not quite, the muzzle tuner doesn't affect the proposed longitudinal wave as the crown is still n length whatever the tuner adjustment. It does affect transverse waves by adding mass/distance. I think. 🙂
  4. So what we need is an adjustable length barrel 😁. It would be possible to increase a non-rifled section, say at the breech end, with threaded sections of differing lengths. Paradox rifling meets adjustable length ? 😉
  5. I think the C.L. theory is maximum and minimum nodes from additive and destructive interference. He uses RF transmission line EM waves as analogy. I'm not convinced that's a valid analogy as EM waves are transverse. (I trained as a radio & telecoms engineer). I'm happy to be corrected - it's been a long time. It's more likely (according to Long) to be timings of the longitudinal wave bouncing back and forth at the speed of sound in steel, therefor one times the bullet to arrive as the maximum wave compression at the muzzle. These compression waves also retard or increase bullet transit time in the barrel by increase and decrease in friction - this affects combustion progress by modulating the gas pressure. It occurred to me that if Chris Long's theory is correct then fitting a muzzle brake will have an affect on the crown by increasing the local stiffness by increasing the cross section of steel. I'm a little skeptical but it's intriguing
  6. Paypal and anti-shooting? What's that got to do with having a Paypal account?
  7. Having read the Chris Long article (which I enjoyed) he seems to be suggesting that longitudinal vibration in the barrel can be used to time/tune OBT to contribute to repeatability by presenting a 'tighter' muzzle condition at the crown and harmonic effects on early stage combustion. Your quoted writer seems to be suggesting damping this down is a good thing - that seems to be counter to the C.L. theory. Having said that I'm not convinced by the Long theory but I can't deny the practical outcome - if it works, it works. Much of the great strides in Victorian engineering were practical, empirical method, they left the science to come along after and explain why. If I understand correctly barrel harmonic tuners are tuning transverse vibration (like a ruler over the edge of a desk), so Long's theory doesn't apply.
  8. I think Big Al has covered that well in an earlier post in this thread.
  9. Popsbengo

    Pre Priming Brass

    There was a court case (reported on another forum some time back). The judge found that a manufactured blank is just that - a blank and therefore ok; but a primed case showed intent to manufacture a live round and is not a blank. I'm not commenting on the judgement right or wrong, it's for the courts. I have no idea what the actual law is but if someone wants to go ahead and make sufficient rounds to perhaps create a test case - well that would do us all a favour in clarifying the law. As has been said here at least two police forces count primed cases towards any allowed number and by extension any primed case for a calibre not approved would be as serious as holding a live round not authorised. I choose to apply the caution principle and stick to our "local" ruling - ultimately right or wrong. A moot point for me as I only make up rounds that I expect to shoot in the near future as I chop and change 'recipes' anyway. Not wise to butt heads with the authorities unless you have sufficient resources to fight a court case and expect to win.
  10. Popsbengo

    Pre Priming Brass

    surely that would depend on the environment. Primers are in a cardboard sleeve over plastic, if the primed brass is in an equally benign environment I can't see the issue. Having said all that, in Staffs primed brass is counted as "live ammo" against the FAC allowance: I can't see the reason to do it.
  11. Amen to that! we should have a sidebar showing subjects that have been flogged to death in ranked order 😁
  12. Popsbengo

    No4 (T)s in Belfast '72

    We had Scaley street patrols as well as doing Sigs core work. I was a Bruin tech specialist so never left Germany (I think this is why Russia never invaded 😉) but many mates toured through NI. Thank goodness that's all behind us - it would be terrible to see a rise of a similar form of sectarian terrorism in the USA.
  13. Popsbengo

    No4 (T)s in Belfast '72

    For the enlightenment of an ex- Scaley; why did the RA deploy as 'close observation' duties in NI ?
  14. There's some excellent stuff on Geoffry's website - already signposted in this thread by 1066. Well worth a read I think the Satterlee "method" is deeply flawed - statistically speaking, drawing conclusions from tiny samples. We've said all this before - for and against.
  15. Popsbengo

    Possible trouble with FEO

    it was a long time ago in a distant universe.....
  16. Popsbengo

    Possible trouble with FEO

    I can't be fussed with weapon verses firearm terminology; all firearms can be weapons but not all weapons are firearms. The anti-lobby aren't going to be influenced by this one way or the other. Anyone from a military background will be very familiar with using 'weapon' to mean rifle et-al. If you use a rifle to kill a deer it's a weapon isn't it? Perfectly reasonable use of English. For politeness and sensitivity to some peoples feelings I try to stick to using 'firearm' in RCO briefings but find I often fall back on drilled in habit and start calling them weapons - even the NRA can't make its mind up, using both terms in their literature.
  17. Popsbengo

    Possible trouble with FEO

    I can't see any justification to refuse you a semi-auto; you have demonstrated a good reason in my opinion. I'd re-approach the FEO and see what he's actually planning to do, we have an FEO here that likes to put pressure on to see if the person has really thought through their request - if you stand your ground you may find he will agree in the end.
  18. Popsbengo

    Possible trouble with FEO

    So what did you give as 'good reason' for 1200 rounds of .22LR? You'd never get 600 centre fire for stalking/varminting in Staffordshire in my experience. You may have had an easy local FEO and now you have one nearer the normal standard - just speculating as I have only experience of three forces; West Midlands, Cheshire and Derbyshire.
  19. Popsbengo

    Possible trouble with FEO

    Are you a member of a Scottish Office approved target shooting club ?
  20. Not a minority of one. As I say earlier in the thread, I've tried it but can't say I'm particularly sold on the reported benefit. I think if all other reloading steps are done well and the case prep is good it probably makes little difference - too little to see on the range in the statistical noise of all the other effects. It certainly didn't give me worse results in .338LM
  21. Note from the NRA today - as we all expected, Bisley is closed: Coronavirus Update 5th January 2021Shooting Ranges Closed Last night the Government ordered shooting ranges to close as part of the new lockdown regulations. Whilst disappointing it was not a surprise, with the daily reports of worryingly high numbers of COVID infections and hard-pressed hospital wards.The closure of our Bisley range complex to civilian shooting includes all rifle ranges, the National Clay Shooting Centre, Bisley Shooting Ground, and armouries. Our training programmes, accommodation and catering will all be suspended during the lockdown.The NRA will continue to support the Police and MOD during these difficult times.Our staff will continue to work hard, Monday to Friday, to ensure that services to members and affiliated clubs are maintained; and that the ranges are primed and ready when restrictions are eased. Please do not hesitate to contact us should you have any queries.We have pencilled mid-March as our best guess for the first shoots of 2021; and hope a successful vaccination campaign will ease pressure on those who work for our terrific NHS and other essential services.We will publish further updates as circumstances change on the NRA website https://nra.org.uk/news-2/ and social media channels.As we collectively hunker down for what will be a challenging few weeks, our thoughts and best wishes are with the target shooting community. Take good care of yourself, your family and friends; we look forward to happy days back on the ranges soon as the days lengthen and weather warms.
  22. Popsbengo

    Labradar

    Ah, so. I'm only a 1st Dan Googler - demoted to yellow belt. No launch date hints as yet?
  23. Popsbengo

    Labradar

    Nothing on their website resembling a Doppler radar
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