pacmcc:
Before you can seat your .334 bullets, be aware that you must increase the size of the orifice in the seater die to accept the larger bullet. The original size of this opening is approx. .331. Some time ago, I bought an extra set of 8x56R Lee dies "just in case". To be able to load both .329/330 bullets, and .334 bullets, I modified my old set to take the .334 through the sizer. I did this with 150 grit sand paper rolled around a thick knitting needle and chucked into the cordless drill. Proceeding carefully and measuring every so often, I got it out to .335, concentric, and still crimps the bullet (if desired).
That orifice in the seater die needs to be held to close tolerances in order to keep the bullet properly aligned with the centerline of the cartridge case.
To go all the way with this conversion, you might want to buy a decapper/sizing ball assembly that is sized .333 or so. That way, the case mouth is more closely matched to the .334 bullet. You can order one from Lee. I found that my cases would take the .334 bullet without any problems or distortion when sized with the original sizer ball.
Fortunately, Lee equipment is inexpensive. I'd be a little more nervous about home mods made to RCBS (Hornady, CH/4D, etc) stuff which typically costs more.
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