Original Ruger M77 300 Win Mag barrel twist?

[Little Dutch]

A buddy has an original Ruger M77 in 300 Win Mag. Internet searches haven't helped me get the twist rate of the original M77's rifling. Does anyone know?
He's not set up to figure it out, but knows I'm shooting a lot of 300 Win right now and wants to take it out.

Thanks.

[Great-Kazoo]

https://www.youtube.com/watch?v=rsiY-je7YCY

[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

[JTP80]

Should be a 24" barrel and 1:10" RH

[20X11]

Have you called Ruger?

[Little Dutch]

Nah, it was after hours by the time I realized I should have. Everything is happening on a compressed timeline; last minute plans. I’ve got my 220’s loaded and packed. We’ll see how it goes in a few hours. Thanks all. I appreciate the replies.

[Sawin]

he doesn't have a cleaning rod and a piece of tape?

[Little Dutch]

Rifle was in storage at a different location. So there was no way to physically check before we went out. It loved the 220 grain Sierra bullets. We picked it up on the way to the range, punched out the bore and shot it.
I think he's excited about this rifle again. Sounds like he's going to update the scope and start shooting it more.

[Sawin]

Rifle was in storage at a different location. So there was no way to physically check before we went out. It loved the 220 grain Sierra bullets. We picked it up on the way to the range, punched out the bore and shot it.
I think he's excited about this rifle again. Sounds like he's going to update the scope and start shooting it more.

That's great news! It's always nice to build confidence and excitment with a rig you already own, and not just something you "wish for" or "dream of"