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I have a mec Sizemaster in 10 Ga. and also have a 410 Ga. conversion kit, they are available from MEC or your dealer. Be aware that sometimes you can get a good deal on a used Mec press here!
bigbull
For the price of the conversion, and the hassle of setting it up back and forth, you'd probably be better off to find a used one. I used to have 3, one for 12g, one for 20g, and one for .410.
It is possible but it's a considerable pain in the ass. Dies are available from MEC but after having paid for them and a new charge bar and bushings it's not that much more expensive just to get a second loader.