Yeah those are calibers rifle model came in, from serial number database it looks like you'll need just normal .30s .
On the offnote, have you lads ever used tripods while hunting? One of my folks wants to get one by Vortex but not sure if it's worth dropping 200$ on it. Model is called High Country II hunting tripod ( https://gritroutdoors.com/optics/optic-accessories/tripods/ ) can see it here. Any advice is welcome(I didn't want to create separate thread for this).