My .308s have averaged $ 0.655 for over 16,000 rounds about 1/2 of which were with Sierra SMKs or TMKs.
The smaller calibers cost less on average.
I shoot everything from .223 to .30-06 and 5 % of the rounds are hand loads - 9mm, 45 ACP and 40 S&W.
It costs a lot less to load .223s than .308s, even with Sierra match bullets.
Also, my costs have been averaged over more than 9 years so they include prices from years ago as well today's prices.
That makes a lot of difference in the cost average.
When I first started, I was loading .308s for less than 50 cents a round.

I too use 210M primers for my .308s and 210s for my large primer hunting rifles.
I primarily use CCI small rifle primers for my .223s and 6.5mm CMs.

I buy in bulk - never less than 500 rounds of any bullet, never less than 5,000 primers, and never less than 8 lbs of powder.
I buy on sales - Brownells gives Edge members 10% off just about every month and I don't pay shipping costs.
They offer reduced hazmat occasionally and I use that to reduce my powder costs.
I average over 20 loads from my Lapua brass - actually about 23 per brass unless I load close to Pmax.