MEC 600 JR. vs. Sizemaster 28 ga. Resizing

[bass806]

Is there any appreciable difference between the resizing process/quality of a 28 ga. hull between the MEC 600 JR vs. the Sizemaster? I have Sizemasters in 12/20 that use the full collet type of resizer and I have no experience with the 600's type of resizer. I picked up a NIB MEC 600 JR sitting in a dusty corner of a local range for $50- so I couldn't pass on it. I will be reloading for a SxS mainly, if that makes a difference. Thanks in advance.

 

[fecmech]

If you are loading for a SXS I see no reason to resize. The shells are going back into the same gun and the better 28 ga hulls are taper wall hulls and you will get no expansion on those hulls. The only place I have ever seen any need for resizing would be going from a gun with large chambers to one with smaller or in gas operated auto's. The gas guns start their ejection sequence while there is still pressure in the barrel which tends to expand the metal shell head slightly in some brands of shells.

 

[Virginian]

I have been using a 700, which resizes just like the 600, to reload just about everything in 12 gauge 2-3/4" and 3" for 28 years with no problems. One of my buddys used to have a Sizemaster or whatever the collet resizer model is. We could never tell much difference in the finished product. Neither one could fix a split Federal high brass either. I have reloaded 20s on a Lee whatever it's called, and 28s on a friends 600 with a conversion kit. They all did fine, although I would prefer a Ponsness Warren progressive.
In my opinion you got a great deal.
P.S. - I have gas autoloaders in 12 and 20, as well as S x Ss, and very rarely ever had a failure to feed or eject, and my 3" waterfowl loads were Hercules' and Ballistic Products' stoutest. If you reload out of a gun with an oversized chamber or a non-Remington 1100, you may well see the swelled hull effects alluded to above. I can't personally speak to how anything may work on those.