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  • john.k's Avatar
    Yesterday, 11:15 PM
    Here s a little known fact.....just about all nitro explosives/propellants have microdots in them that can be identified from the residue,pinning down manufacturer and batch details.
    18 replies | 302 view(s)
  • john.k's Avatar
    Yesterday, 11:09 PM
    The PP bullet still has groove marks,but none of the scrapes and cuts that bullets are identified by......but nowdays the cops can lift DNA from fired bullets,and identify powder and primer residue in microgrammes.......and the rifling specs may...
    18 replies | 302 view(s)
  • john.k's Avatar
    Yesterday, 10:42 PM
    Stuck pull thru s was a very common blowup in a smelly......Some one I know did it using a bit of blanket as a patch,the old dodge with a pullthru was to tie the cord around something ,if it got stuck,and pull the rifle with all your weight.If the...
    28 replies | 5591 view(s)
  • john.k's Avatar
    Yesterday, 04:11 AM
    I think that M14 is a Chinese barrel let go.....still the Martini action in the pic showed a remarkable resistance to splitting ,mainly because its not possible for a case to let gas go into the reciever......even the extractor cut is a very close...
    28 replies | 5591 view(s)
  • john.k's Avatar
    06-14-2018, 07:15 PM
    Sooner or later ,everyone who uses reduced loads of fast powder in big cases will have a double charge......most times we are lucky ,and the result is only a stuck and deformed case....But IMHO ,a 24gn charge of Unique would be 70-90,000psi...
    28 replies | 5591 view(s)
  • john.k's Avatar
    06-14-2018, 06:59 PM
    Another problem where I was ,is that managers were made criminally liable for workplace injuries and environmental breaches.......the new manager was a complete idiot ,mainly because of the state of the whole operation......the new owners wanted the...
    23 replies | 764 view(s)
  • john.k's Avatar
    06-14-2018, 04:36 AM
    I had to take time off when my aged mother got out of hospital,the place was so slack that the office never told the boss that I rang to tell them,and the young guys who wanted my job spread the word that I had a heart attack...When I went back,I...
    23 replies | 764 view(s)
  • john.k's Avatar
    06-14-2018, 04:17 AM
    A double load,24 gns would do it .Loads go about 16gn Unique/175gn cast for 40,000psi,so 24gn would be up there.
    28 replies | 5591 view(s)
  • john.k's Avatar
    06-13-2018, 07:56 PM
    You will also note that the Martini is Belgian,and that the split seems to involve the rearsight base......This was a noted problem.....Quote"The brazing of the sight base spoils the steel in the barrel"...Especially if brass spelter was used...
    28 replies | 5591 view(s)
  • john.k's Avatar
    06-11-2018, 08:08 PM
    Ive often thought that a gunsafe disguised as a bed base,or a setee would be a good way to hide it away.Obviously not so easy to access,but if I had to leave a house unlived in for a period,I would do this.
    22 replies | 7572 view(s)
  • john.k's Avatar
    06-11-2018, 08:01 PM
    john.k replied to a thread How much tractor? in Our Town
    there is nothing wrong with HS,provided its properly specced,as will be anything Kubota......HS does have an hour run limit,about 7000hrs for the smaller quality machines.Look for quality components like Daikin, Sundstrand,Eaton etc.......When HS...
    67 replies | 1452 view(s)
  • john.k's Avatar
    06-11-2018, 04:34 AM
    I dont think the 93 sets back from pressure.....I think its just plain wear....the steel is quite soft and the case hardening is thin.....when the bolts been opened and closed a million or more times,in dusty conditions,the guns is just plain wore...
    20 replies | 505 view(s)
  • john.k's Avatar
    06-11-2018, 04:27 AM
    because of the law here,I store and transport guns with the blocks in a locked ammo box...One day I arrived at a shoot a long way from home,and I had included the wrong blocks.......So I shot with them,one from a Mk4 was good,one was short ,and...
    15 replies | 531 view(s)
  • john.k's Avatar
    06-10-2018, 08:26 PM
    I ve bought a couple of chainsaw sharpeners for around $30-$40......made in China ,of course,but although they aint no precision machine,they work well........maybe you have carbide tipped chain?
    20 replies | 766 view(s)
  • john.k's Avatar
    06-09-2018, 01:58 AM
    john.k replied to a thread an emplyee in Our Town
    Nursing assistance is also a fairly high risk occupation for back injury etc......so I would make sure I was well covered against any claim,statutory or common law........IMHO,anyone who does years of care on the promise of an inheritance is a...
    26 replies | 1001 view(s)
  • john.k's Avatar
    06-08-2018, 08:17 PM
    I have a couple of vehicles that old,with that kind of mileage......I dont think Henry Ford was fibbin when I bought them,cause he said they had zero miles on them.......And I would spend any money to keep them going,cause new diesels are so...
    59 replies | 1507 view(s)
  • john.k's Avatar
    06-08-2018, 07:38 PM
    I have see a similar problem caused by a badly corroded primer ring extending into the firing pin hole,and taking the whole surface where the primer seats against the breech face.....Its a bit difficult to see the breech face on a martini,and damage...
    15 replies | 531 view(s)
  • john.k's Avatar
    06-08-2018, 10:52 AM
    both magnesium and zinc ignite and burn quietly,spectacular,but not dangerous ,in my experience.....When casting brass,overheating can ignite the zinc,but with the availability of cheap thermocouples there should be no problem
    38 replies | 1262 view(s)
  • john.k's Avatar
    06-08-2018, 10:48 AM
    Overpowder wads will ring the chamber.....not hearsay ,have done it.
    19 replies | 587 view(s)
  • john.k's Avatar
    06-08-2018, 10:42 AM
    Dunno about your max loads....when I first got my Marlin,1970s,a load by Elmer Keith was recommended...... 50 some odd grains of 4895 and a 450gn bullet......I regularly shot a 30-06 M17.....the 45-70 load was an eye opener.......I only fired half a...
    30 replies | 834 view(s)
  • john.k's Avatar
    06-08-2018, 10:21 AM
    With the dovetailed block conversion ,the block was softened at the front,dovetail slot cut,piece inserted and screw staked.....but the block was not rehardened,and is so soft that the extractor damages the front part.The insert is made from a high...
    15 replies | 531 view(s)
  • john.k's Avatar
    06-08-2018, 02:29 AM
    Pure aluminium will pick up silicon from sand,and cans could probably be made to cast a lot easier by experimenting with sand flour,which is available for making investment molds.Ive never tried,because I had large stocks of scrap crankcases and...
    38 replies | 1262 view(s)
  • john.k's Avatar
    06-07-2018, 07:45 PM
    Depends on the primer.....I use both the .217" size and the .250 " and .254" size......needless to say a little modification of the nipple may be required.It helps if you have a lathe.......an indispensable accessory for shooting old guns,IMHO.
    8 replies | 288 view(s)
  • john.k's Avatar
    06-07-2018, 07:35 PM
    In the days when big Martinis were worthless,you used to see some real out of sight modifications.....the commonest being grinding of the block so a 303 smelly barrel could be used.The best being to wind copper wire in the gap between barrel and...
    15 replies | 531 view(s)
  • john.k's Avatar
    06-06-2018, 06:53 PM
    If you read the US Army tests of the 1870s ,there were several magazine explosions in the test guns.Admittely with a different type of priming than the modern cases have.
    17 replies | 496 view(s)
  • john.k's Avatar
    06-06-2018, 12:59 AM
    Seems like the expander is set too high......I have Lee dies,and find they work good,but the collet gripping the expander is one thing I dont like......the expander has to be set almost down inside the collet,and doesnt look right,but thats to...
    24 replies | 690 view(s)
  • john.k's Avatar
    06-06-2018, 12:40 AM
    I found with capping breechloaders winged caps are too weak....so I use RWS berdan primers.....four times the blast,and never fail to ignite whatever is in the chamber.......
    8 replies | 288 view(s)
  • john.k's Avatar
    06-06-2018, 12:36 AM
    Ill settle for a fine arkansas stone ,so s as not to offend anyone.
    38 replies | 1262 view(s)
  • john.k's Avatar
    06-06-2018, 12:21 AM
    Where I worked had big compressors,one was ocassionally blowing a 600 amp fuse on one circuit.....I looked in my box of bits,cause the owners didnt buy anything new,or even second hand,but salvaged scrap for electrics.I fiound a matched set of...
    36 replies | 1544 view(s)
  • john.k's Avatar
    06-04-2018, 10:39 PM
    There can be a fair bit of length variation in breech blocks.....One of my guns has a very short block,and no other block will close in the action.......Also check that you dont have a bushed 303 block that someone has lapped to remove a primer...
    15 replies | 531 view(s)
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About john.k

Basic Information

About john.k
Biography:
retired mechanic/engineer.
Location:
brisbane ,qld,australia
Interests:
shooting,machinery,bikes
Occupation:
retired

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check