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Miseryguts

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Posts posted by Miseryguts

  1. 12 hours ago, Leezie said:

    Thanks SMLE & Miseryguts. 👍 I've been "rolling my own" for the past 35-years...started out with handgun reloading, but have never loaded hardcast (other than in a .45-70 Gov) in longs before. Just found the H&N's online. Just need some Unique or Green Dot now. Miseryguts, would you be prepared to share any load information that I could try at completely my own risk? 

    Thanks again fellas. Much appreciated. 

    Hi, will PM you my load under the proviso that I make no claims as to the suitability or safety of the load, and can take no responsibility for any consequent damage.

    M

  2. 1 hour ago, SMLE said:

    Have you considered lead cast loads using a powder such as Unique?

    You can buy cast lead bullets from people like the shell house bullet company on line and using a much reduced load over say 100yards, start to get a real feel for wind and elevation.

    Don’t recommend this if your not an experienced reloader though and even if you are make sure you reference reputable load data from people like Lyman for example.

    +1 on that, Unique or Green Dot with H&N plated bullets (165gn RN) 0.5moa at 100yards, loaded to be subsonic, loudest noise is the bullet hitting the back stop. Bullets cost 13p each, powder 5p, primer 4.5p  - total 22.5p. Thats almost as cheap as rimfire. If you want the bang, just remove the moderator

    M smiling in sunny Monmouthshire

  3. Hi, decided to try Ultrasonic cleaning, but my first unit packed up after only 4 or 5 cycles. Amazon refunded straight away, but don't want to go thru the hassle again, just want a unit that works!

    Looking at the GT Sonic 6 Litre unit', it has 60 day no hassle return and 18 months replacement warranty, but I just want it to work. Any one running one of these units or something similar?

    There appear to be several models of this make, and a lot of others that look exactly like it on Amazon.

    What is every one else using, and do they stand up to use?

    M

  4. Interesting figures - I can see the vertical figures being thereabouts, but the loss of velocity over 300 yards is excellent. I assume this down to the superior BC of the bullet you are using.

    Unfortunately I cannot chrono velocty at distance, only at muzzle - I assume you have a LabRadar(sp?) set up.

    Managed to get out between the showers earlier and shoot some rounds off over my cheapo chronometer and get a target at 56 yards(maximum safe distance in the drive to my house - we have no neighbours within a mile or so)

    Chrono figures are: 24 shots Average MV 1049,Velocity Spread 38, Sd 8

    Target below is 9 shots

    Load is 7.0gr Green Dot over 165gr H&N RN, PPU brass, CCI 200 primer, COAL 2.645 for jump to lands of 30 thou.

    Need a break in the weather to get out to my 100/200 yard range - provided it is not still flooded

    M  a bit happier in Monmouthshire

     

     

    308 subsonic load dev. 02 11 2019.jpg

  5. 1 hour ago, Catch-22 said:

    I will move to 5x shot groups. By this point I’m close to my final load, so want to know what it’s like both accuracy wise and also run a final check on velocity and ES/SD values.

    Hi, I see here everyone is coming from re 3 shot groups and larger calibres and expense, but surely even 5 shot groups do not give sufficient data points to enable a realistic evaluation of velocity ES and Sd? Staticians/mathematicians to the fore?

    1 hour ago, Catch-22 said:

    But as has been mentioned, you’ve got to be careful not to let shooter fatigue come into play,

    Especially  true in my case! Due to my disabilities this is a big problem for me, and is very difficult to factor into the equation

    Ho Hum

    M watching the rain come down in Monmouthshire

  6. 9 hours ago, One on top of two said:

    the subs are good fun, I shot them today out to 150 yards. My favourites ATM have to be the 167 Lapua scenar. I can twang steel out to 300 m and still get a very satisfying DONG ! 
    and of course you have the added benefit of no one hearing you having the time of your life 😂

    Hi, just as a matter of interest, what drop are you allowing at 150 and 300, and what is your zero distance? I am developing a subsonic load using green dot and  H&N 165gn RN and getting good results at 50m as per your picture, but the crap weather is stopping me getting out to my ground to try longer ranges

    M very damp round the edges in Monmouthshire

  7. Hi, on reading various posts on this forum, I see a lot of talk on 3 shot and 5 shot group data. Bear with a thick novice, but surely 3 shot groups do not give a fair indication of how good/bad a group is??

    I have shot some amazing three shot groups, but by the time I get to 10 shots, it has gone to hades in a handcart! below some figures I have to hand shot with a 22 at 50m. ( I have never kept a 3 shot group or notes on same)

    Target 1                                                          Target 2

    6 shot ES 0.5moa; MR 0.29moa                 6 shot: not noted

    8shot ES 0.99moa; MR 0.39moa                8 Shot: ES 0.99moa; MR 0.27moa

    10 shot ES 1.48moa; MR 0.48moa            10 shot: ES 1.74moa; MR 0.39moa

     Target 3                                                          Target 4

    6 shot ES 0.45moa; MR 0.15moa               6 shot ES 0.53moa; MR 0.15moa

    8 shot ES 1.01moa; MR 0.33moa               8shot ES 0.86moa; MR 0.22moa

    10 shot ES 1.36moa: MR 0.42moa            10 shot ES 1.52moa; MR 0.34moa

    The above was just to see how bad I am at 10 shot groups, perhaps I should stick to 3?

    So, what is the consensus 3? 5? 10? 20? 

    M diving for the parapet in Monmouthshire

  8. 3 hours ago, Plecotus said:

    I regularly shoot the SMK 155 (2156) and found, after a lot of experimentation, that in my rifle, with my load, .015" will give me a sub-0.5MOA group at 100yds.  Might not be right for yours of course.  Only testing will determine but that's half the fun. 

    Very close to the Monmouthshire border....and also, very damp!!

    Hi, yes, I load 2155(which I assume you mean in the above) to COAL of 2.800 to give a jump to lands of 45-50 thou, on top of 43gr N540 which last time out gave me 4 shot group 0.4moa at 200 yards - good enough for me anyway! The ELD(TMK) version of this (5155) is what is giving me the headache, as that bullet at COAL 2.850 gives a jump of 125 thou to land, and that means that the neck is only gripping about 0.25 inches of the bullet, nor will it fit the magazine and would have to be fed by hand. Not had chance to shoot these yet as we have gales and/or rain most days here - at least on the days I have time to go to the range as I have a shoot which takes up a fair bit of time also.

    As I see you are near Chepstow, I assume you shoot at Severnside? Provided the weather is clement I will be there on Sunday to try these loads on the 200 yard range in the afternoon.

    M

  9. Hi, I am in the depths of working up loads for a 308 win rifle, trying various bullets etc. Two of the bullets are of the tipped low drag variety (no names) when loaded to maximum SAAMI spec COAL (2.810) with this rifle have huge jumps to the lands (over 100 thou.) The "worst" has a jump of 127 thou when loaded to a COAL of 2.850, which just fits the magazine. 

    Has any one else come across this, or is the chamber on my rifle out of kilter?

    Not had chance to shoot these trial loads yet, as waiting for a gap in the rain!

    M twiddling his thumbs and worrying in wet wet monmouthshire

  10. Hi Lurch, any particular reason for wanting nickle plated? From my experience of nickle plated straight wall brass, it splits after 2 or 3 reloads. BTW crimped once fired is not a problem, a primer pocket reamer for a few pound sorts that out for the life of the brass. At some ranges you can get once fired brass for the toil of picking them up!

    ATB M

  11. great stuff bb69!  Many thanks for the informative reply. Shot the green dot loads today, 8gr green dot with 165gr H&N TC bullet gave a 10 shot group with an average mv of 1180fps(sounded just supersonic) and an Sd of 7. At 50 yards the group Es was 0.7moa

    Will be trying 7.5 and 7.0gr loads next

    M less miserable now the sun is out in monmouthshire

  12. 10 hours ago, BlueBoy69 said:

    A great example of the two powders relative bulk densities.

    Going back to cast, etc., for subsonic velocity rounds. Yep, as any rimfire user will attest, the lead and lube deposits certainly gunk-up your silencer.

    For the suppressed 300 AAC Blackout rifle I have, I just use H&N 165 grain plated and plastic-coated round nose bullets with Tin Star or what's left of my Trail Boss pot. They make more noise impacting the target than on firing.

    These, or preferably other heavier plated, or powder-coated heavy 308 bullets should be suitable for 308 Winchester subsonic loads... if you can find some.

    OK, so what load do you use with the H&N bullets? I have just had some delivered and loaded some up with green dot, but not had chance to pop 'em off yet. The green dot with jacketed bullets made more noise on hitting the backstop than on firing , as you pointed out - great no need for ear plugs!! But the variation in velocity was pretty big, and group size was definitely underwhelming! Looking to get some tin star (N32C), but have got the chance of some Titewad at a knockdown price so may give that a whirl. I think the tightwad is probably a bit faster than N32C, and is very popular in the US for cowboy action shooting

    M (wishing the rain would stop in Monmouthshire)

  13. Hi, I live within easy driving distance of the Rogiet MoD range, and would like to join a club which has access to that range.

    Can any one advise on a club which has access? I have a SSC, and have had a FAC for 50+ years, and am a member of two other clubs which unfortunately do not have long range facilities

    Reason is, I want to stretch my 308 to 400 and 600 yards, but the maximum safe distance I have on my land is 330 yards.

    Another factor is that I am a bit disabled, and would need to be able to drive to firing point (or within a few yards anyway) - not a problem on my land as I use a quad bike, but I doubt that would be allowed on a MoD Range!

    M (twiddling his thumbs in wet, wet Monmouthshire)

  14. I seem to remember a thread on here concerning excessive headspace causing light primer strikes.

    So, how much headspace is excessive? Just got some once fired lapua brass whose headspace is 1.610 to 1.615, whereas once fired brass from my rifle measures 1.625. All measured with the same comparator. By my reckoning, this means that the Lapua  brass will have an extra 10 to 15 thou of headspace. Am I digging myself a hole?

    M(worrying in wet Monmouthshire)

     

     

     

  15. 11 hours ago, BlueBoy69 said:

    I think this is one of those internet/shooting community fallacies or the phrase I like to use, it's one of those folkorical statements.

    From a background of actual weapon testing as a contractor to the MoD measuring chamber pressures and many other things when a gun fires or a bomb goes bang, along with research into this, its highly unlikely detonation occurs. Firstly detonation is a shockwave driven decomposition event and what happens here is something different, a combination of extremely rapid burning (deflagration) due to the grain geometry (a flat bed, or towards one end or the other) and the effect of pressure wave formation on the propellant's burning rate.

    As far as I can remember, what happens is when the case, or chamber for caseless guns, is mostly empty or partially full, the ignition phase of the propellant can result in dangerous pressure wave formation. These waves can reflect off the walls of the vessel without much attenuation as there's not much propellant there. If waves arrive at the right moment, they can add up, so increasing chamber pressure. Increasing the pressure increases the burning rate, which increases the pressure, which increases the burning rate, etc.. This oscillation occurs until the propellant burns away, the gun fails (the so-called detonation event), or for some reason, the phenomena stops.

    Anyway, that's the basics of the more likely real reason for these blow-up with light charges of fast-burning powder in large cases. The other reason for this is probably double, or more loads of fast pistol powder by accident, something no one wants to own up to.

    If you've actually seen the detonation of a high explosive within a chamber or the bore of a gun, the damage signature if very different to a high-pressure burst due to overpressure.

    Anyway, for more info of pressure waves in guns, try the paper listed below.

    Charge Design Considerations and Their Effect On Pressure Waves In Guns - ARBRL-TR-02277 (1990)

    That or get the book titled 'Progress in Astronautics and Aeronautics: Vol 66 - Interior Ballistics of Guns'.

    https://www.amazon.co.uk/Interior-Ballistics-Progress-Astronautics-Aeronautics/dp/0915928329

    I have a copy, but due to its cost now, there's no way I'm lending it to anyone.

    As above, go to:

    https://www.thestalkingdirectory.co.uk/threads/subsonic-308-150g-or-220g.141266/

    and scroll down to post 14. Written by some one quite familiar on this forum? 

    M

     

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