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UPDATE:
I mistakenly assumed that this brass was 7.5 French based on a faulty head stamp recollection.
Cartoucherie de Toulouse, Toulouse, France head stamp is TE, not TA.
I'll leave the post text intact, just in case somebody is interested.
Skip down to discuss forming 7.5 MAS from 7.5 Swiss.
UPDATE2:
The dies to convert 7.5 Swiss to 7.5 MAS do exist, but acquiring one doesn't make a lot of sense in my situation. It might be the just ticket for somebody, though.
Link to 50% off RCBS case-forming die:
http://www.midsouthshooterssupply.com/item.asp?sku=0004458199
ORIGINAL POST:
I scrounged up some French 7.5 (MAS) brass at the range––almost 200 cases––but upon closer inspection I'm guessing it all must have been fired in the chamber of a rifle with headspace issues.
This once-fired brass mics at 2.179 –– which is .053 longer than MAX.
The spec is .482 ––but it mics at .494
Unfired French Military Cartridge For Comparison:
PRVI Partizan:
How does that happen? Should I assume this brass was shot in a rifle with headspace issues?
The once-fired case beside 2 unfired cartridges (French mil and PRVI) Note the height of the shoulder.
Just to see if it would size I tried running it up into my sizing die––it took 3 or four attempts, but it finally sized (Imperial is the tits)––but afterward there was a distinct belt at the base, almost like it was a belted magnum.
After seeing the bulge at the base I tried running a once-fired case up into an RCBS Trim Die instead––and it did size full length in the RCBS Trim Die (insert case half way, extract case when resistance builds/serious resistance is felt, smear sizing die wax around, finish sizing case)––It sized well, there was no belt, but at the top of the sizing stroke I was astounded at how much brass there was to trim. The already long case had stretched even further––2.178 to 2.213 (!).
Picture above illustrates (L-R ) once-fired bad headspace brass, brass re-sized in RCBS Trim Die, and 2 virgin cartridges, 1 French military and 1 PRVI Partizan.
My question is: Is it safe to resize this brass in the trim die, trim it, then the FL sizing die, and then reload it––or am I asking for a case-head separation?
On the left is the original once-fired. On the right is the (untrimmed) brass after it has been sized in the trim die
I'm reluctant to scrap this brass, but I absolutely will if I should.
What do you think––will I be able to get away with all that sizing––or am I asking for trouble?
I'd appreciate any advice.
SPECS for 7.5 French MAS
MAX CASE LENGTH: 2.126
TRIM TO LENGTH: 2.116
THIS PARTICULAR ONCE_FIRED BRASS:
1X Fired Brass length: 2.178
1X Fired after sizing in RCBS trim die: 2.213 (!)
BASE MICS AT .496 vs, .486 SAAMI Spec.
I mistakenly assumed that this brass was 7.5 French based on a faulty head stamp recollection.
Cartoucherie de Toulouse, Toulouse, France head stamp is TE, not TA.
I'll leave the post text intact, just in case somebody is interested.
Skip down to discuss forming 7.5 MAS from 7.5 Swiss.
UPDATE2:
The dies to convert 7.5 Swiss to 7.5 MAS do exist, but acquiring one doesn't make a lot of sense in my situation. It might be the just ticket for somebody, though.
Link to 50% off RCBS case-forming die:
http://www.midsouthshooterssupply.com/item.asp?sku=0004458199
ORIGINAL POST:
I scrounged up some French 7.5 (MAS) brass at the range––almost 200 cases––but upon closer inspection I'm guessing it all must have been fired in the chamber of a rifle with headspace issues.
This once-fired brass mics at 2.179 –– which is .053 longer than MAX.
The spec is .482 ––but it mics at .494
Unfired French Military Cartridge For Comparison:
PRVI Partizan:
How does that happen? Should I assume this brass was shot in a rifle with headspace issues?
The once-fired case beside 2 unfired cartridges (French mil and PRVI) Note the height of the shoulder.
Just to see if it would size I tried running it up into my sizing die––it took 3 or four attempts, but it finally sized (Imperial is the tits)––but afterward there was a distinct belt at the base, almost like it was a belted magnum.
After seeing the bulge at the base I tried running a once-fired case up into an RCBS Trim Die instead––and it did size full length in the RCBS Trim Die (insert case half way, extract case when resistance builds/serious resistance is felt, smear sizing die wax around, finish sizing case)––It sized well, there was no belt, but at the top of the sizing stroke I was astounded at how much brass there was to trim. The already long case had stretched even further––2.178 to 2.213 (!).
Picture above illustrates (L-R ) once-fired bad headspace brass, brass re-sized in RCBS Trim Die, and 2 virgin cartridges, 1 French military and 1 PRVI Partizan.
My question is: Is it safe to resize this brass in the trim die, trim it, then the FL sizing die, and then reload it––or am I asking for a case-head separation?
On the left is the original once-fired. On the right is the (untrimmed) brass after it has been sized in the trim die
I'm reluctant to scrap this brass, but I absolutely will if I should.
What do you think––will I be able to get away with all that sizing––or am I asking for trouble?
I'd appreciate any advice.
SPECS for 7.5 French MAS
MAX CASE LENGTH: 2.126
TRIM TO LENGTH: 2.116
THIS PARTICULAR ONCE_FIRED BRASS:
1X Fired Brass length: 2.178
1X Fired after sizing in RCBS trim die: 2.213 (!)
BASE MICS AT .496 vs, .486 SAAMI Spec.
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