Original Ruger M77 300 Win Mag barrel twist?

[Little Dutch]

As mentioned, he's not set up to do that. Thanks though...

Edit:
Maybe I should have been clearer, or less vague. Rifle is in storage. No one will be able to physically check rifling until it's too late to change plans.
I was not able to find any relevant data on the web. I spent too much time looking. It's like it's forbidden knowledge.
I'm going to pack on the assumption it's the standard 1:10 and load appropriately. It'll be fine, It'll go bang, maybe it'll shoot tiny groups too.
Thanks