Don't think the length will let you get there without some kind of insert or possibly shortening the entire breech and rethreading the barrel lug, even 6.5 Swedish Mauser is way long:
From left to right: 7.92×33mm, 7.62×39mm, 5.56×45mm NATO, 7.62×51mm NATO, .303 British, 6.5×55mm, 7.92×57 Mauser, .30-06 Springfield rifle cartridges.
By Volhv944 - Own work, CC BY-SA 4.0,
https://commons.wikimedia.org/w/index.php?curid=73782846