What causes sticky bolts?


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Zack
July 13, 2010, 04:49 PM
I was reviewing 7.62x54r surplus ammo on steal cased and brass, and it seams that steal cased sticks more often then brass. I heard someone because something to due with brass vs steal. I thought steal or brass expands in the barrel chamber one of the other. ?

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rcmodel
July 13, 2010, 04:53 PM
Steel cases expand the same as brass cases under firing pressure, but they don't contract as much after the pressure drops to zero.

Just not as much spring in steel as there is with brass. It just expands under pressure and then stays that way when the pressure drops.

rc

Dr T
July 13, 2010, 04:55 PM
Dirty chamber.

Reaction between cosmoline (not cleaned from chamber) and coating on steel case.

Excessive pressure.

armoredman
July 13, 2010, 06:55 PM
Get a 20 gauge bronze brush, add to a rod, take it and a cordless drill to the range. Fire five through the Mosin, remove botl and clean the chamber by spraying with your favorite gunk remover, and drill it with that brush. Clean normally, then fire five again. Repeat entire process, and the sticky bolt, (cosmo trapped in pits in the steel reacting with laqured cases), should be gone.

Kymasabe
July 13, 2010, 07:00 PM
...sticky nuts. duh!

Actually, I think it's cosmoline.

rodregier
July 13, 2010, 07:05 PM
Carb cleaner lifts out cosmoline well. Wear gloves, use eye protection, ensure lots of ventilation.

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