You might be able to find .410 parts for your Mec 600 Jr to switch from 12 or 20 Ga. set ups.....
or get parts from Mec or a used unit on the internet but that will cost a lot more if you don't already have a Mec loader.
$350 plus for a loader +/-.........
Youtube, Jan 12,2015 has a good thread on setting up for 410 .........
if you dob't have the manual.
Parts adjustment is needed for a correct movement of parts, so the unit
and the hulls are not damaged and put together, correctlyfor a nice finished product.
or get parts from Mec or a used unit on the internet but that will cost a lot more if you don't already have a Mec loader.
$350 plus for a loader +/-.........
Youtube, Jan 12,2015 has a good thread on setting up for 410 .........
if you dob't have the manual.
Parts adjustment is needed for a correct movement of parts, so the unit
and the hulls are not damaged and put together, correctlyfor a nice finished product.