I've bought about a dozen molds from Accurate Molds, in both aluminum and brass, and have been very happy with them. Pretty sure you could find what you're looking for there...I see 3 standard ones right off the bat. I'm thinking most folks who can blow 600 gr downrange in one shot are probably looking for a single or two cavity mold at most
It is big enough to size to your .512" and only $26.90 direct from Lee.
I recommend you try it UN- sized before considering sizing. It should be big enough as cast for a slide fit to chamber and require no sizing, just a tumble lube. Cast bullets that fit correctly should take 1-2 pounds more push than a drop in fit to chamber. Make a dummy round and ink the bullet. chamber/unchamber and a slide fit will be identifiable on the top exposed bearing band. A slide fit that you can manageably chamber is the best fit you can get. Any less subtracts accuracy potential.
You only need one good fitting bullet to make your rifle shoot well and it should with this Lee mold.
I know you want a 600 gr but re-evaluate your reasons and get the Lee, it will kill the largest Grizz easily with a very modest load.
Lyman recommends 10 powders for a Cast 515 gr. in 50-70, any of them at START for the Lee 500 gr. is a wonderful hunting load: I'd choose this one:
*RX7 25 gr.
BHN 15 Lyman #2 alloy is recommended to match the load level. Your velocity will be slightly higher and your pressure slightly lower with the Lee 500 gr. compared to a 515 gr.
*verify Lyman Cast Bullet Handbook 4th Ed page 231.
I never look at the dates of the opening post! And always chuckle when someone brings up the fact that they are really old! Keep on resurrecting these old posts because i don't go through the archives much and would never see some of this stuff
If you can live with a 500 grain mould , Lee makes a 50 cal. 515-500-F , plain base that is quite affordable it's product number is 90266 . Midway has the double cavity for $19.79 and is available . I'm sure that will fit into your budget.
Lee also has a 50 cal. 450 grain mould (#90255) if your interested in an "express bullet" For 20 bucks I would order both....you never know what mould will work out to be best.
16+ years....Never mind...he probably has sold the rifle by now!
I really need to look at the dates of these posts..feel dumb.
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