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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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Interesting information. Thanks for posting.
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It's nice to be important, but it's more important to be nice!
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Online Points: 6539 |
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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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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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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. |
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Online Points: 6539 |
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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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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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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.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Online Points: 6539 |
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Yes, the black residue inside the case mouth. Is that Tempilstick?
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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yes it is.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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Thanks, that's worth knowing.
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It's nice to be important, but it's more important to be nice!
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Online Points: 6539 |
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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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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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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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