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Zed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: November 18 2020 at 9:47am
Interesting information. Thanks for posting.

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Post Options Post Options   Thanks (1) Thanks(1)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 19 2020 at 8:07am
Goosic, I was reading the section in the Sierra Ed. V reloading manual on gas gun reloading and came across this description of reloading M852 match cases.  I don’t know it it apples to the lot you have, but you might want to look for a rolled-in cannelure just in front of the extractor groove.  


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Post Options Post Options   Thanks (1) Thanks(1)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 19 2020 at 10:55am
I have a handful of those.
I was given them by a match shooter using an M1a. He told me he would never re-load them.
I used them as test beds for setting up annealing times.

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 19 2020 at 6:45pm
Looks like they may have had the black tar bullet sealant.  That stuff would practically weld the bullet to the case after 20 or more years of storage.  Shooters would break the seal before firing these cartridges by using a bullet seating die to push the bullet into the case just far enough to break the sealant.  It’s surprising how much force it takes to break this seal. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 20 2020 at 7:46am
Are you referring to my fired cases?
If so its just the residue of the "Tempilstick" heat sensitive crayon I use when setting up. It turns black when it hits the target temperature.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 20 2020 at 6:03pm
 Yes, the black residue inside the case mouth.  Is that Tempilstick? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 21 2020 at 11:14am
yes it is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2020 at 10:05am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2020 at 10:59am
Thanks, that's worth knowing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2020 at 11:32am
The problem explained in the Sierra Manual refers to reloading these cases, not the original problem they had with head separations occurring on firing of the factory loaded ammunition.  The issue with reloading the cases continued until the knurling was discontinued, although apparently not predictable. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2020 at 12:08pm
The excerpt was from the 7.62 Match Cartridge Accuracy Improvement Program by J.W. Hettel and went on to explain the the new knurling was moved lower on the case to .300" from the head as opposed to the original .500" from the urging of competitive shooters who were also reloading the cases after the fact...
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