Curious as to why you didn't go 35 Whelan?
When Nosler data says a Whelan will push 225gr bullets to 2800fps while the .338-06 will only do 2600fps, I've always thought I'd go the Whelan route if I wanted to build a medium bore on the '06 case.
Honestly the Whelen is an awesome round but the end of a standard montana barrel is only .560". Boring out to .338 only leaves .111" on each side of the bore for metal. A .358 hole would have left roughly .1" which it's getting super light. That and I like the more bullet options of the 338 family. Yes I know if I really like bullet options I should have got a 30-06 but everyone has one of those in Kimber Montana. Figure someone has to be first to try a 338-06 on this platform
