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The Dillon Precision Super 1050 progressive machine will handle 30-06 length cartridges, but nothing any longer than that.
The original 300 Winchester Magnum has a brass length and overall cartridge length longer than the 30-06, so it won't work in the Super 1050 press.
You'd be better off loading rifle on a Dillon 650. The 1050 brings nothing extra to the table and
HAD A FEW SHORTCOMINGS for loading rifle. OAL variance for one thing, and you cannot properly resized and load rifle on the same toolhead unless you are using a Lee Collet die. The cases have to be lubed, and then it needs to be removed before you lube.
Actually a Dillon 550 is likely a better choice.
