I wouldn't bother with the 6 cavity unless you have a bottom pour furnace.
If you buy the 6 cavity and don't have a bottom pour, then the next thing you're going to want is a bottom pour.
One of my favorite bullets for general purpose 44 mag full loads is the Ranch Dog 265 grain bullet. If you're shooing a Ruger it might appreciate the extra fat bullet.
I have that RD 265 for full power stuff and Lee's 200 grain RNFP for my "light" 44 bullet.
If you want to try some, I could send you some samples for the cost of shipping ($5.40 for USPS flat rate). Just shoot me a PM.