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matt_hooks

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Everything posted by matt_hooks

  1. matt_hooks
    Sound volume decreases in an inverse relationship to the distance, so the further away you are, the lower the noise level. It is an inverse square relationship (due to the energy dissipation over a circular area) and so sound level decreases very rapidly. Try the experiment again, but with the phone 12" to the side of the barrel, and then 12" in front of the barrel. It'll show you how the sound is reduced with distance, and how it projects towards the target, which is the most important thing.
  2. matt_hooks
    Firstly, what were the parameters of your test? Distance from the muzzle? In front/behind/to the side? Which side? The iPhone mic is designed to pick up speech level sounds, and at the normal speech frequencies, so will probably not be very efficient at picking up percussive noises. Also, firing without a pellet will make a big difference to the sound signature. The pellet will cause the discharged air to be slower, so will often have a lower impulse level. A 4dB decrease is almost 25% less sound, so quite a big decrease. Of course 82dB is still quite loud.
  3. matt_hooks
    I believe 1/4 will have 4 grooves, and 1/2 3 grooves. No grooves is cylinder choke, 1 groove is full choke, 2 grooves 3/4 choke and finally 5 grooves is "Skeet" which is less choke than 1/4, but more than cylinder.
  4. matt_hooks
    all species To be precise, all species as long as you use the right bullet. In Scotland there is a minimum bullet weight (100gr) as well as a minimum velocity and energy requirements. Calibre/energy/velocity requirements are as follows. (copied from the BASC website, http://www.basc.org.uk/en/codes-of-practice/deer-stalking.cfm) England and Wales For Muntjac and Chinese Water deer only- a rifle with a minimum calibre of not less than .220 inches and muzzle energy of not less than 1000 foot pounds and a bullet weight of not less than 50 grains may be used. For all deer o
  5. matt_hooks
    No pissing contest here, just an unusual point of view for a shooting man.
  6. matt_hooks
    I'm glad it's not more policed. Most shooters started with an old, knocked about BSA air sporter or such. It's a cheap(ish) easy way in to the sport. Without the "off ticket" guns far fewer people would go in to the FAC sort of shooting. Regulation serves only to criminalise. If someone wants to get hold of a firearm with criminal intent then they will. The only ones restriction punishes are the law abiding!
  7. matt_hooks
    I'm sure a miner would have no trouble buying a knife, but a minor should not be able to. Or a gun either. Look at the "violent crime reduction bill" for more information. This smells a bit of "anti fishing expedition" to me!
  8. matt_hooks
    The Chinese are more than capable of making high quality goods. Granted most of the product we see from there is pretty poor, but that's more down to the economics of the situation than any inherent inability to produce quality. We demand low priced goods, and the easiest way to reduce price is to reduce quality. As for the rounds, I guess there's no way of knowing other than to run a few through the rifle.
  9. matt_hooks
    The expansion of diameter would vary depending on the barrel form. What I think is more relevant in terms of thermal expansion would be a lengthening of the barrel, which will inevitably change the barrel harmonics.
  10. matt_hooks
    Simon, where in Wilts are you? There are a few of us around about those parts. There's DavyT in Swindon, and a few others.
  11. matt_hooks
    I wouldn't count on it. Look at the cases of people who have been convicted with possession of a S1 firearm for holding an air weapon which is over the legal limit, even when they bought it in good faith from an RFD. It is the possession which is an offence, it matters not how you came to be in possession. Maybe they would prosecute, maybe not, I'd rather not take the risk! Now the weapon is back with them. Point out to them the risks that they have exposed you to. A cock-up like that shouldn't happen!
  12. matt_hooks
    Does it go baaaa?
  13. matt_hooks
    Mine isn't bolted to the floor, and I know a lot of people who have their cabinets elevated for exactly that reason. As long as it's not easy to get a jack or something under it, and it can take a grown man hanging off it then you'll be fine!
  14. matt_hooks
    rich, I have a degree in aeronautical engineering, so yes, fairly conversant with the relevant physics. The transonic regime isn't that complicated! And what you are saying about it is frankly wrong. Transonic flow conditions can only occur when the bullet is travelling through the air, and whilst it is in the barrel it is in a confined state and therefore air flow exerts far less influence. So the bullet is decelerating as soon as it leaves the barrel, so yes, the effect I am discussing occurs only when the bullet is decelerating. Destabilisation is not the issue. Your phraseo
  15. matt_hooks
    Without seeing the land, it's impossible to say. The .22 long is not renowned for its accuracy at any rate.
  16. matt_hooks
    You are currently in possession of a section one firearm without a certificate. The fact that this is by someone elses omission is neither here nor there. If for any reason the police decide to check on it, for example they see a post on a forum, then you will be in deep doggy doo doo. Say goodbye to your FAC and SGC for starters. The RFD has committed a serious breach by supplying a section one firearm to someone who does not have the proper authorisation, so he would be in deep doo doo too, a good bargaining chip! You need to get it back to him ASAP. Even if it means losing some wor
  17. matt_hooks
    Stability is not the problem. The problem is out of balance forces. (NOT the same thing) Unless a bullet is perfectly balanced and symmetrical, parts of it will enter the transonic regime at different times. Air flow around some parts of the bullet will remain subsonic, whilst that around other parts will be supersonic. This coupled with gyroscopic precession can easily cause shot to shot variation. Now look at the difference in flow between supersonic and subsonic regimes. Subsonic flow is virtually incompressible, and a boundary layer can form reducing drag and helping keep flow laminar.
  18. matt_hooks
    It was a serious question. If you proclaim with such certainty that the transonic effect is imaginary, or at least negligible, then you must have some evidence to base this opinion on. If you do then I'd like to hear it, as it might help inform my opinions. On the other hand, if it's a "I don't think it does" then I'll carry on with my opinion regarding transonic flow and the effects on a body flying through it.
  19. matt_hooks
    Come on then Rich, explain the transonic regime to us, and give us your learned thoughts on how it might affect flight of a free flying, unpowered projectile. Edited to add, it is probably some of the rounds running slightly hot.
  20. matt_hooks
    Just don't get anything that ejects backwards, or that has the ejection port set back. Mate tried firing an SA80 (bullpup design) left handed. Bang OW. Bang OW! Made us all chuckle for quite a while!
  21. matt_hooks
    Smokey, should be no problem lamping, just make sure you don't shine the lamp towards oncoming trains. You should be able to hear them coming a long time before they arrive and shine away, or turn the lamp off. Lamping is the easiest hunting method for rabbits.
  22. matt_hooks
    The firearms licencing staff sometimes don't understand that there is a difference between a .22LR and a .22WMR. They don't understand that they are both rimfire cartridges. Perhaps the police should have a training course on ammunition and firearms before they take on the role, a bit like DSC. I'm sure BASC would be pleased to provide a suitable syllabus!
  23. matt_hooks
    The idea is you put WHAT you want/have to sell in the title so people can see if they're interested in it. They already know you want to buy/sell/swap because of the title!
  24. matt_hooks
    223, another case of the licencing department making it up as they go along. They put .22 rimfire (or .22rf) then there is no possible way they can argue that .22WMR isn't included in that. If their intent is to only allow you .22LR, then that is what they should state. The HO guidance is very clear on this. As an aside, the aplication form asks only for calibre, not chambering, so there is no need to state which .22 you require on the form (though they will almost certainly phone and ask whether you want a .22 rimire/LR, or a centrefire, and they should then ask which centrefire or rimfir
  25. matt_hooks
    What model is the scope crackshot?
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