1KPerDay
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I can only speak about the one guy I know that does this and he shoots 9 Major. He says typical dies won't effectively resize the web area that gets moved around by the overpressure.
Roll Sizing - A new way to re-size brass cases
- Thread starter rfwobbly
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I find that after shooting the same case a few dozen times the bulge often becomes more noticable. I think it might be worth bringing them back at some point. I dont know what that point is.
Given the price I think I would just throw out the seriously bulged cases that I coukd not run through a bulge buster die.
Given the price I think I would just throw out the seriously bulged cases that I coukd not run through a bulge buster die.
Well now this makes more sense than anything else that I've heard. I'm not a big volume reloader but understand that if I was the roll sizing may be of great benefit. This is what I like about this site, people can have discussions about various shooting related items and by and large if you have an open mind you're going to learn something new.
Otto
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Roll / base sizing is basically meant to salvage junk brass. My finished 9mm cartridges have a gage failure rate of less than 0.05% using a L.E. Wilson gage and even less with a Shockbottle. If a bad round is found...it gets trashed and I move on.
jmorris
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LOL, one could say the same thing the same thing about a regular size die. If you don't have one of them, all fired brass is junk brass.
As a regular size die just puts the brass that moved, upon firing, back into its original position. All a roll sizer does is to ensure that the portion of the case a standard die cannot contact, is also in its original position. They are not magic, just another tool, if a case is gone, its gone.
In any case (no pun intended) if you only have one round fail for every 2000 loaded, I wouldn't buy one either.
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Toprudder
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What does the roll sizer fix that a bulge buster doesn’t fix? Possibly a slightly tapered case, like a 9x19, I guess, but the rims on those can be fixed with a bulge buster and 9mak FCD. Couple a bulge-buster with the new Lee APP and you can really process some brass.
mcb
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Not much. But as you indicate a roll sizer can maintains the proper taper on a case that traditional sizing dies cannot. It also does a better job at conditioning the case rim and head then a bulge buster. Again that is minor performance increases. The big thing is volume. A roll size even a manually operated one with a case feeder can out run a bulge buster when volume matters.
jmorris
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As you point out, all a push through sizer can do is make sure all parts of the case are at one OD. So it does little for tapered cases like the 9mm or semi rimmed cases like the 38 super.
Also, If there are imperfections in the extractor grove. they too cannot be ironed out. a roll sizer can get into this area..
As far as speed goes the fastest push through sizer I know if is the Magma case master at 5500+ an hour.
They had been around for years before Lee began making their bulge busters but at $6500 for one caliber, they were really just for remanufactures.
http://www.magmaengineering.com/case-master-rimless-case-sizer/
Scarch made a roll sizer much like the one in the OP but they went out of business more than a decade ago. Likely because they made the $6000 casemaster seem in expensive.
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