Got a bug in my azz and dug out a SA 308 Savage magazine, stuffed three 360 rounds in it, but there is some binding on the first two rims someplace and they wouldn't feed up. Also Feed lips are too wide and the two rounds wanted to pop out. Maybe a 22-250 mag would be better and I have one of those someplace if I ever can find it.
Had my Ruger 77 40x1.8 on the bench, 3 dummy rounds staggered in mag box fine, bolt picked them up enough for the extractor to grab and eject but bolt face would need to be opened a little for the bigger casehead.
Next i tried a mag bolt but the extractor is cut back to far and wouldn't grab the casehead. So swapped extractors with the standard bolt which picked and fed 3 rounds but wouldn't eject the 3rd round. Didn't have time to deep dive into it today to see why.
I haven't gave up on the Savage yet, have to find a SA mag bolthead but after seeing how the 77 did, might just need to open a std face bolthead up and maybe do some extractor work.