SuperCub said:
All cartridges were "new" at one time or another. Some have more "options" than others, which is a good thing. If larger case capacity is a key point for the 375 Ruger, why not go with the 375RUM and pour about 100gr of powder into it if needed or less for optional reduced loads. The longer action really doesn't make that much difference when it's all said and done.
The 375 RUM does offer more options for increased velocity over the Ruger, just as the Ruger has more options for loading over the 375/338.
There are several reasons I went for the Ruger, though:
You cannot fit a 375 RUM into a standard length Ruger aciton wihtout modification.
Nobody chambers 375 RUM in a stainless CRF action (that I am aware of)
If you want to load it down H&H/Ruger velociites you will probably still need to use more powder to generate the same velocities
I persoanlly don't need RUM performance levels. If you do, then get one, I am sure you will enjoy it.
The trouble with new cartridges arriving on the scene now is that on average the shooting population is getting older and for the most part don't see any use for switching from their tried and true .270Win (for example) to the Short mags (for example).
This sounds like it's a PERSON problem and not a NEW CARTRIDGE problem.
I wouldn't suggest to someone that they abandon thier favorite rifle/cartridge to get something new, but if they are the type that finds different things interesting, why not have that option?
So the fact remains to be seen in about 20yrs from now if these new ones will still be with us or not.
Cartridge appeal ebbs and flows..The 280 was all but dead and then it got very popular. The 280AI is now a factory cartridge, the 338-06 was chambered in Weatherby rifles and factory ammo was made for a time, now it seems its been dropped again.
The WSM's have been selling like crazy for the last few years, so it's unlikely they will dissapear anytime soon, the RSAUMs never sold well so I doubt they will be around in 20 years.