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1
The Brundage/Hamby 10 Consecutive Ruger Barrels has been sent all over the world - now 724 participants from 36 countries: 15 of whom have used some form of imaging. CSAFE - Center for Statistics and Applications in Forensic Evidence - at Iowa State imaged the known and unknown bullets using Sensofar and inter compared all the LEA's against each other. They were able to identify using about 1/2 of a LEA. Article "Algorithmic Approaches to Match Degraded Land Impressions" by Eric Hare, Heike Hofmann & Alicia Carriquiry reports on this research.       
3
Are they also going to do a new standard cartridge case?
4
Technical Assistance / Re: Frankfort vs. Frankford
« Last post by Humpy on September 23, 2018, 01:32:14 PM »
Frankford Arsenal  (FA) was closed in 1976 time frame.  The last Commanding Officer was Col Frank Hackley, a long time friend.  He is the author of some very unique books on ammo loaded by FA.  Any book you see Frank Hackley's name on get it.  Frank is 87 now I think.


Fire Control and Ammo Engineers were transferred to Picatinny Arsenal NJ until they retired.
5
Technical Assistance / Re: Unknown cylindrical objects
« Last post by Humpy on September 23, 2018, 01:20:02 PM »
When I first saw the pic I thought they were pressure "coppers" used to check striker energy or measure pressure in a chamber.  The pressure chambers for artillery pieces have round balls (such as you picture) and the pressure vessel is submerged in the propellant and when the gun is fired you start looking for the gage which can be upwards of 60 yards from the muzzle all the way to still in the case.


But since you say they are magnetic they can't be copper so that rules them  out.





The above pic shows a "copper cylinder" inserted in "copper holder" for checking striker indents.


click on pictures and they will get larger to give more detail.





After the indent is made the "copper" is removed and inserted in a bench inspection gage and the depth of the indent is recorded.  This shows .0185" indent which is more than SAAMI recommends but less than some vendors want for their internal standards. I prefer my indents at .020" depth or deeper.
6
Call For Assistance Feedback / Re: Individual marks from consecutive manufactured barrels
« Last post by Humpy on September 23, 2018, 08:22:13 AM »
FWIW I have had extensive tours of Ruger, Smith & Wesson, Colt and Rock Island Arsenal and I have never seen barrels arranged in such a way so that they were assembled into a weapon in the order or manufacture. For instance at Ruger you will see hundreds of revolvers fully assembled with no serial numbers.  This is because they are not serial numbered until they are ready to go into a shipping box.  I also worked with guys who worked at Springfield Armory and know their receivers were not serial numbered in order of manufacture.


The closest I ever got to receiving consecutive barrels was I ordered  two 30 cal rifle barrels with a specific contour from same vendor.  I installed both barrels on Winchester Model 70 actions.  I headspaced both barrels to snug on headspace gage and used same chambering reamer on both barrels.


When I barrel a rifle I insert a barrel erosion gage to take a reading on where the throat locates on the gage before first shot is fired and record that in the log I keep on every rifle.


Erosion gages are marked by rings.  The gov't gages have ring separations every .100".  I inserted gages in both rifles and the differences  in the location of the erosion gage stop points was ONE AND ONE HALF RINGS APART ! ! ! !   Obviously this means there was a significant variation in the internal diameter of the barrels.


30 cal barrels (not machineguns) generally show gage advancement of one ring per 1000 rounds fired as the throat is subjected to high heat and pressures on firing and the barrel material is removed and the bullet has to travel further until it contacts the rifling.


This difference in bore diameter show when gaging new barrels on other rifles as well.  For instance you can take a erosion gage for M1 Garand or M14 rifle and gage new barrels and you will find the gages do not locate at the first mark on the gages.


I have  Olympus Series 5 Borescopes (the best)  and other borescopes and my findings in throat wear differences is amazing.  For instance on a new barrel the reamer leaves rings in the throat.  In normal highpower rifle competition shooting 58 to 130 rounds are expended per day once a load is developed and is taken to the range.  On 30 cal barrels the rings in the throat are generally burned away at between  100 and 150 rounds.


Thus the barrel is continually changing through out its life and is becoming for lack of a better term smoother as the continuous rounds pass down it.


Borescope examinations reveal other significant variations.  The amount of bullet contact with the grooves varies greatly barrel to barrel.  On some barrels the groove contact is significant all the way to the muzzle where in others very minimal contact is is apparent.


Note: Borescopes can be had that view straight forward and others view barrel surfaces at different angles up to 90 degrees.  You will see much more surface anomaly with a angled bore scope of at least 30 degree.  On my Olympus borescopes back in 2002 time frame one was $2700.00 and the other was $4700.00.  The smaller the diameter the higher the cost.
7
While not exactly what I was looking for I received this from another forum thought you folks would like to know.


In Iraq an Iragi police officer shot one of our guys in back of the head with a M4 loaded with M855 ammo at a range of SIX INCHES.  Round exited his right eye and was bleeding profusely.


Our guys thought he was dead but they put him on a chopper and sent him to hospital AND THE GUY LIVED ! ! ! ! !   He also had loss of hearing in right ear and a little difficulty walking but last this knew three years later he was still in the Army when the recaller got discharged ! ! ! !


That guy was in very good standing with the Lord as that is the only explanation I can figure that got him through it.



8
The big reloading suppliers have Winchester, Remington brass.  I suspect they will sell to anyone that will throw enough money at them.


I have traded new unprimed 308 Win brass for 7.5 Swiss brass about 8 or ten years back when you just could not find brass to feed a new acquisition.
9

Does anyone have any information about anyone being shot with a highpower rifle 6.5MM or larger delivering a solid thoracic cavity hit and survived?

6.5 Carcano, 6.5 Jap, 6.5X55, 260 Rem etc


Does anyone have any information about a 6.5MM or larger high power rifle projectile stopping within a human body and the range it was initiated from?

Fackler told me very few folks survive thoracic cavity hits from 6.5MM or larger center fire.
10
Headstamp Submissions / Re: Where do you post new headstamps?
« Last post by Jill Therriault on September 21, 2018, 08:27:33 AM »
You can add them here:
http://forum.afte.org/index.php?topic=10088.15
or email them directly to me:  jill.therriault@ct.gov
Thanks!  :)
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