If they were shot in a fluted barrel machine gun it makes it 2x as hard
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How would you modify it to accept the shell holder and sizing die?
I was actually able to make the press strong enough to where I can apply the leverage without the table breaking and well…….the handle itself started to bend. I got the primer half way out before it couldn’t go out any further.You'd be using that press as an arbor press, for which there are different types of dies:
Every time I've seen those kinds of dies used, they do one step. The usual reason people use them is for extreme precision and not so much the ability to apply huge force. Every time I've had to deal with stubborn brass, a percentage of the brass ended up with a damaged case head or the case head ripped off, although that was 308 Win in an RCBS Rockchucker.
But if you did want to go the arbor-press route, you'd de-prime with a de-capping pin die that ONLY removes the primer. Then follow it up with neck sizing (example above). As you can see with the die above, these tools themselves aren't cheap.
Maybe a better idea is find a used RCBS Ammomaster or similar (or someone who would lend you the bench time) because if those cases are giving you that much trouble, you really are going to need that leverage. And have a broken case remover kit available.
The other thing is your case lube. The cheapest solution to your problem might be try using some Imperial Wax.
I was actually able to make the press strong enough to where I can apply the leverage without the table breaking and well…….the handle itself started to bend. I got the primer half way out before it couldn’t go out any further.