i just built a 338 rum on a savage rum action.
savage actions come in quite a variety, shorts, longs, and the slightly longer rum actions. none will work as an edge repeater, the longest savage magbox is 3.6" the edge rounds usually have an OAL of 3.8"ish
you have a short(308) and a long(270). either could be made into a single shot edge. but...u need to find a magnum bolthead - which uses an action mounted ejector, which neither of ur actions have; or you could search here, i think some guys have used the standard magnum pushfeed bolthead for rums, but im not sure. they will be tight, if theyll work at all. then u get into firing pins etc, and they arent always interchangeable when u change boltheads. i went through all this when i planned my rum and just purchased a used 300 rum, and all i had to do was replace the barrel.
also, the various length savage actions can take 2 different sized barrels, these actions are reffered to as small or large shank. at some point savage started making rums, wsms etc on the large shank only. anyways ur best bet may be to read up a bit here, learn the various savage differences before u plunk down the cash to do this build.
id buy this, screw in a 338 rum barrel, and start shootin.
http://www.gunbroker.com/Auction/Vie...Item=165523495
my barrel was $300 from mcgowen w a 2 month wait. they would need to rent the edge reamer, so it would probably be about $350. w the rifle above all u need is the barrel - but w any OAL greater than 3.6" itll be a single shot
throw in $100-150 for a brake plus installation...
hth
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