My MEC 600 was bending rims on Cheddite hulls. Lot of pressure needed to size. Remington or Federal no problem. Little Imperial size wax cured it. Design of the sizing ring is not all that good either are the Cheddites. Reducing friction fixed it.
Longer term and for me a better solution is size and Prime on my Ponsness Warren 375. Knock the primed hull out with a fitted Delrin rod. Then finish the load on the MEC. Fact is for short 10 the MEC is a poor sizer good crimper PW good sizer poor crimper. Separate MEC sizer would do the same thing.
William
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Threaded Mode