Turning 6.5m saum brass into 7mm saum.

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BigBore585

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So I really want to build another 7mm Saum, but brass is nonexistent. I found a good supply of SDG 6.5mm Saum brass. So never having done this, could I just run the 6.5 saum brass into a 7mm saum sizing die and just neck up the case and load some ammo or will other steps be needed? The case dimensions are identical from what I have found.

Thanks
 
It might be better to buy a special die for necking up via a mandrel. Not sure how easy it would be to run a smaller caliber over a sizing button.

Regardless the inside of the neck needs to be lubricated.
 
BigBore585 said:
So I really want to build another 7mm Saum, but brass is nonexistent. I found a good supply of SDG 6.5mm Saum brass. So never having done this, could I just run the 6.5 saum brass into a 7mm saum sizing die and just neck up the case and load some ammo or will other steps be needed? The case dimensions are identical from what I have found.

Thanks
Click to expand...

Is it new brass? Use some imperial sizing wax in and outside the neck. Then just run them into your 7 saum die. If they are once firaed, you might want to anneal them first. - dan
 
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dan belisle said:
Is it new brass? Use some imperial sizing wax in and outside the neck. Then just run them into your 7 saum die. If they are once firaed, you might want to anneal ghem fiarst. - dan
Click to expand...

Yeah its new brass. It’s the ADG annealed line. Yeah I figured typical lube neck. I was figuring it would be as easy as just running it into a 7mm Saum die, and just load it.

Thank You.
 
Size and go, shoulder is in the same spot for both, 264 to 284 is not a huge stretch on the neck, lots of lube, go slow.
 
I have been doing exactly what you ask about - new 8x57 PPU brass formed into 9.3x57 brass - simply run the original 8x57 (.321 ID?) into Hornady Custom 9.3x57 die with a long tapered expander like in several Lee dies - maybe all Hornady expanders made that way?? Result is what appears to be 9.3x57 cases - so perhaps .364" ID?? As recommended on-line - from that 9.3x57 die sizing, I then go on, by using a Lyman die for 41 mag (perhaps .408" ID?) - so makes into a nearly straight wall case - then back into that 9.3x57 die to set the shoulder so that it is just snug to close the bolt on my rifle, who's Husqvarna barrel is apparently chambered for 9.3x57. Then fire-form. I do not own 9.3x57 gauges, but that brass then fits to that chamber - whether it is to 9.3x57 spec or not, I do not know (nor care!). Perhaps not as quite drastic as OP wants to try - perhaps an annealing step, besides lube, might be appropriate?

Is several posters on CGN - myself included - who have used the COW method to "blow out" 300 Win Mag and 7mm Rem Mag brass into 458 Win Mag cases.
 
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