I bought some brass from an ODT member last week and he threw in a bunch of handloads with the deal. 6.5 CM and gave me his recipe.
Instead of pulling the bullets and dumping the powder, I decided to go ahead and shoot them to fireform to my rifle and save a step.
On the 5th shot the cartridge was so far overpreassure that it jammed the cartridge and bolt in the rifle.
I now need a new bolt, extractor and a bit of gunsmith work done to hopefully get the rifle back in working order.
Fortunately, no one was hurt and the rifle should be able to be repaired.
I then pulled all of the bullets to find out what was going on with these handloads.
The recipe I was first told was 41 gr of H4350 and with the 143ELDX bullet.
These are the charges I measured from the cases:
Low charge was 35.9
High charge was 41.7
After I told the User he went back to look at his recipe and changed it to: 42gr of H4350 w/ COAL-2.73
I did a quick water capacity measurement of the brass and work up in GRT: shown below*
This recipe would give about 68K pressure.
I can't imagine how someone could have a powder charge weight variable by almost SIX GRAINS
This guy seemed like a nice guy, was apologetic and offered to contribute to the repairs.
In any case, I will never shoot another handload from someone else.
Good Luck and Stay Safe
Russ
Instead of pulling the bullets and dumping the powder, I decided to go ahead and shoot them to fireform to my rifle and save a step.
On the 5th shot the cartridge was so far overpreassure that it jammed the cartridge and bolt in the rifle.
I now need a new bolt, extractor and a bit of gunsmith work done to hopefully get the rifle back in working order.
Fortunately, no one was hurt and the rifle should be able to be repaired.
I then pulled all of the bullets to find out what was going on with these handloads.
The recipe I was first told was 41 gr of H4350 and with the 143ELDX bullet.
These are the charges I measured from the cases:
Low charge was 35.9
High charge was 41.7
After I told the User he went back to look at his recipe and changed it to: 42gr of H4350 w/ COAL-2.73
I did a quick water capacity measurement of the brass and work up in GRT: shown below*
This recipe would give about 68K pressure.
I can't imagine how someone could have a powder charge weight variable by almost SIX GRAINS
This guy seemed like a nice guy, was apologetic and offered to contribute to the repairs.
In any case, I will never shoot another handload from someone else.
Good Luck and Stay Safe
Russ