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Yep, they come lubed, with gas check. They were $40 plus postage per hundred last time I bought some (late last year), rural postage was $8.30 IIRC.

Roll crimping must be into the cannelure, the Lee factory crimp doesn't, and I think taper crimp doesn't.

I seat so that the case mouth is at the top groove in your photo.
I don’t load to an OAL with the cast bullets, I don’t even measure them.

I seat to the cannelure and lightly crimp the case. Other forum members have said crimping improved accuracy.

I was told I didn't need to, so I don't.

4.5 MOA difference for me between supers at 200m and subs at 50m

With cast 151gr bullets my 1:12 twist 24 inch barrel is subsonic at 7.5 grains of Trailboss. My 1:8 twist 16.5 inch barrel is 8 grains.
I have some 190gr Sub-X loads but can't get to the range until...