it's kind of pointless going heavier than 180 in a 308 anyway, esp if you have a "short " action- the likes of a savage 99 or whatever- i saw a cut away in a magazine a while back that showed that you got bullet actually sitting in the powder when seated for "standard" mag length- now if you've got something on say a 30-06 length action, you can seat it out there where it needs to be- i tried this on some of my reloads with 190 grain matches and sure enough, there was a powder line on the bullets = i was using ww748,
besides the velocity drops away off and the pressure gets too high, or so i found with my stuff- there are loads listed for 200 grainers in my speer manual, but you also have to consider the twist of your barrel- the 308 comes in both 1/12 and 1/10 according to manufacturer- if it's a 1/12 the max according to a chart i have is 180- the 1/10 is good right till 220, but by then your velocity has dropped off considerably- the 190, 200, and 220 are better suited to the 06 where it has the case capacity and proper twist to take advantage of the heavier bullet