Couple of other thoughts - if your reloader comes with a red plastic/rubber handle get the wooden one. It's longer will be much easier to pull. Just cut the old one off and throw it away. Mec charge bars come in two different styles - the 300 or 500 series. The 300 is for single stage presses and what you want. If it were me I'd spend the extra money and buy the adjustable bar - it'll save you money in the long run and JMHO, much easier to use if changing from 10 to 12 on the same press. Plus, if you have a ditigal scale [ and you really should have some sort of means to measure powder weights to be safe ] you can make sure you're throwing exactly what you want, be it shot or powder. Sometimes just a little less or more shot will give you a nice crimp. Can't do that with the bar and bushing set-up. If you do get one make sure it's for the single stage press [ 600jr].
www.precisionreloading.com has everything you need at what I believe the best prices. One time I ordered through them something that wasn't in their catalog [ a Mec part ] that was shipped from Mec but billed to them and it was cheaper than what Mec wanted for it.