The reason that people don't think these dies work well on large cases is that the case has a large volume, so the piston stroke is "used up", before filling out the case.
The solution to that is:
Use oil instead of water (works better whether you are using small or large cases). When the piston is down, withdraw the case, and fill it with oil AGAIN, and hit it a second time.
The piston is actually more effect on large cases than small ones, because the pressure/force developed is the ratio of the surface area of the piston, divided into the surface area of the inside of the case... the larger the case is, the more effective the piston is. You just have to replenish the oil, cuz the volume eats it up.
Wash the cases in hot water and liquid Tide, dry with a hair drier.
Adjust the headspace (the "crush"), by adjusting the die for as much "crush" as you need for the first firing.
On BIG guns, it's a shame to use up precious barrel life on fireforming, or spend a day at the range shooting Cream of Wheat and still not have fully formed cases.
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