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About Shuggy

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    Target shooting in all forms; hunting for the odd pigeon or bunny; wristwatches; fountain pens.

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  1. Shuggy

    Velocity plateaus in load testing: Why?

    Don’t worry; Bradders will be along in a minute to tell us to just get out and shoot! 🙂
  2. Shuggy

    Velocity plateaus in load testing: Why?

    It certainly can, but not in every case. There is lots of research going into the use of additives to specifically tune these characteristics. As Laurie says, these sorts of things are enough to give a munitions designer a headache. Trying to explain these things theoretically is very difficult and there is little substitute for lots of empirical testing.
  3. Shuggy

    Velocity plateaus in load testing: Why?

    @brown dog No, I don’t think that I’m conflating things. The relationship which can show plateaus/mesas is burning rate vs pressure. Lots of things can change pressure though; charge weight, propellant morphology, temperature, volume, shot start. It’s a complicated subject!
  4. Shuggy

    Velocity plateaus in load testing: Why?

    Not sure which article you mean; the one on 6.5 guys? I reckon that it’s hard to say, as they don’t exactly use a statistically significant sample size. But my point is that the hypothesis of looking for ‘velocity flat spots’ can be explained by well recognised propellant burning rate behaviours.
  5. Shuggy

    Velocity plateaus in load testing: Why?

    @MJR Try Combustion of Solid Propellants by G. Lengellé, J. Duterque, J.F. Trubert for a good review. But be warned, it’s pretty technical stuff. There are loads of others: Google Scholar is your friend!
  6. Which is precisely why I haven’t got round to getting a 6.5 Creedmoor barrel yet. The GGG 308 is silly accurate from the AX308 and the HPS is almost as good. I very rarely shoot beyond 600 yards and even then, I quite enjoy the challenge of 308 from a 20” barrel at long range (somewhat easier on balmy summer days!).
  7. Shuggy

    Velocity plateaus in load testing: Why?

    Hi guys. Plateau and mesa effects in propellant burning are a real thing and have been known about for many decades by energetic chemists designing gun and rocket propellants. The generally accepted theory is that they are caused by the propellant additives (e.g stabilisers, deterrents) having different surface regression/pressure rates compared to the base propellant (nitrocellulose or nitrocellulose and nitroglycerine for small arms). There are many academic papers about this in the literature if you care to look.
  8. Grand. So 6.5 Creedmoor or 6.5x55 for the OP.
  9. I went through a similar thought process as I mulled over a spare barrel for my AX308. For the different types suggested, here are the different types of each ammo in stock at my local gunshop: - 6.5x47. None - 6.5 Creedmoor. 13 - 6-6.5x47. None (not factory!) - 6XC. 1 - 260 Rem. None - 6mm BR. None - 7mm/284. None (not factory!) - 224 Valkyrie. None (not a 308 bolt!) - 22 Middlestead. None (not factory!) - 0.243 fast twist. 31. Lots of deer and varminint loads, but no target. - 6mm Creedmoor. None - 6.5x55. 9 (not a 308 bolt) When, you look at it this way, the answer is obvious: 6.5 Creedmoor. 6.5x55 is also a good option, but I think that you need a new bolt head and magazine and this wouldn’t work in my AX308. If you get into handloading for your target loads, then 243 fast twist is also an interesting choice, with plenty of cheap deer and varmint loads also on tap.
  10. The health and safety aspect of brakes is worth a bit more discussion. My son is deaf, so I have a pretty good insight just how life-changing hearing loss can be. When he was diagnosed, they checked my hearing too. I was relieved to learn that after years of shooting, but being meticulous about hearing protection, I still had perfect hearing. Not so long ago, I saw a comprehensive set of professionally done noise measurements for a wide range of firearms. The ‘at ear’ measurements for those with brakes was a bit of an eye opener. Suffice to say that when using a rifle with a brake, I now wear double hearing protection (earplugs plus muffs), or use a moderator instead. Brakes are useful devices, but it is a good idea to fully protect your hearing.
  11. Velo Dog pistols were churned out in the 1000s by loads of Belgium manufacturers in the late 1800s. I’d guess that value is probably £100-200 tops. Legality wise, it’s perfectly OK to hold this as a ‘curiosity or ornament’ under Section 58(2). Calibre is probably the 5.5mm Velo Dog, which I believe was made by Fiocchi up until a few years ago. Having any ammo though would be decidedly dodgy and would put you at some risk of falling into Section 5. Unless of course you were going to hold it as a ‘heritage pistol’ under Section 7(1) or 7(3).
  12. Shuggy

    Advice on vintage watch

    A little research would show you several modern mechanical watch brands that are not in the least bit cheap and cheerful. Some have been mentioned already, e.g. Seiko, Orient, Seagull, Timefactors, Steinhart. There’s nothing wrong at all with a vintage watch, but you really have to factor in the cost of a service.
  13. Shuggy

    OCD rant!

    The ones that make me really grit my teeth on US YouTube gun channels are ‘chassiss’ and ‘ambidextreeous’.
  14. Shuggy

    Amazing group!

    That reminds me of the US golfer Jerry Barber, who was once told that he was really lucky. His response: “The harder I practice, the luckier I get.”
  15. Have a look at Longrange blog on YouTube (THLR.NO and ‘Roe’ on here). He has been shooting a Blaser in 300 NM. Lots of relevant info, starting from video 204. I reckon almost everyone on here would enjoy Thomas’ channel!

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