Originally Posted by SBruce
Would you explain what you mean by the 338 RUM having the advantages?
I've always been under the impression that the whole reason for the 338 Edge was the added powder capacity of the 300RUM case as compared to the 338RUM case.
As I look at the two dummy cartridges I keep for the two, I am reminded as to how very little difference there is between them. I need to actually measure the powder capacity of the 300 & 338 Ultras (I load for both). If 2800fps is all the Edge is good for, I would seriously consider whether or not the 20fps advantage is worth it. I'm running 300SMK's out of my RUM @ 2780 & that is from AI mags. I guess you can call it an "edge" in performance, but a nominal one at best. the +P on the other hand is quite a bit different & well worth the extra step in reloading.
Only a few advantages to the RUM. One less step in the reloading process, Shorter OAL (pretty important if you're running a mag fed setup), Less powder consumption for near identical performance.