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SURPLUS AMMO WARNING: No US made Carbine ammo has ever been loaded with the corrosive Mercury primers! Early ammo did have Chloride base primers (table salt) so normal Nitro solvent will do fine. NOW the scarry part: In the early 90's we started seeing brass that was green from corroded from Mercury priming! It was head stamped "LC 53" and Berdan primed. It came from China and was copied from our ammo. It was in 50 round boxes that looked just like 1953 Lake City boxes, BUT in small print said "Made in China"! You must use solvent for Mercury priming on this ammo, and I have no idea how to get it out of you gas piston/block!
At one point I bought a Ruger Blackhawk in 30 Carbine, It had the 7.5" barrel. Surplus Ammo stuck very badly and even with ear plus or muffs it hurt my ears very badly! the W 296 reloads stuck also. The H-4227 reloads extracted just fine. That is actually a good indicator of how it will do as to velocity in a Carbine! So the rule of thumb is: If it's fun to shoot in a Blackhawk, it's pretty slow in a real M-1 Carbine!
Ivan
I started seeing the Chinese 30 Carbine ammo in the mid to late 80's (shortly after the surplus market took off again thanks changes in the law). Later, working for an ammo vendor at gun shows saw a lot more of it. It came in the typical galvanized cans used by many of the comm bloc nations. Most of it was packed in plain cardboard boxes with a simple rubber stamped description on top (Carbine 30 Cal M1 iirc). We sold a lot of it, I shot quite a bit myself. Older US issue bore cleaner seemed to clean it up okay (I had a lot of it so that was what I used). Never had an issue with corrosion even in the gas piston (my habit of spraying brake clean there may have helped) though I heard of others having problems. The twin flash holes for the Berdan primers were a dead giveaway on the fired cases that they weren't what they appeared to be.
I still run across this stuff at the shows even now, there was an awful lot of it sold here. Though rarely seen now French made 30 Carbine does show up occasionally. It is also Berdan primed and most of it is corrosive (there were some lots that weren't according to some collectors I know) and is very prone to not firing due to age and the type of priming compound used.
The mercury is not the issue with corrosion, it is the chloride salts left after firing Chlorate primers (which were widely used for many years by many countries). You need a water based cleaner to remove Chlorate residue which is what older US military bore cleaners have. Mercury fouling can be removed from the bore by most regular cleaning solvents but tends to attack the brass and it is generally considered unsafe to reload cases that have been used with Mercuric primers as the brass becomes brittle and prone to splitting. Mercuric primers tended to have a shorter life than Chlorate and most countries had abandoned them by the WWII era. ............ As to US Carbine ammo the government decided early on to issue non corrosive 30 Carbine only as better suited to field cleaning methods and not requiring the removal of the gas piston reducing the chances of damage or loss by the troops.
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