I wouldn't sweat slight cratering (and I don't in my .300 win mag - it does it too) as long as .....
#1 You're not exceeding the max powder charge or max velocity using manufacturers current published load data.
It's probably of a sign of a sloppy firing pin/bolt and/or a soft primer cup moreso than a high pressure sign.
Another thing to look at - just for peace of mind - is how flat the primer edges get as you're working up towards max.
I'd go with #1 above any "traditional pressure signs".
