Cast bullets in a 6.5 Creedmoor?

[xtrm41]

Thought I'd give my 6.5 Creedmoor a try using cast boolits with gas checks.
I slugged my barrel and it came out .262 several times in succession.
Jacketed bullets are .264, Lyman suggests .264 for cast bullets also.
Should I stick with .264 or go up to .265 with my sizing die?
I'll most likely use lead with a BHN of 20+

[runfiverun]

well now you know your barrels diameter.

what you really want to know is what shape your throat is.
will that .265 boolit even chamber?

20 bhn? don't drop one or it'll probably break, or break at a groove when seating.