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Got some stats to prove that?..... Or is this just what is said at a the Wednesday night dancing banana cult meetings before the Kool aid gets passed around?
Well, Superbrad..................................................................................................................................
I just pay attention to some stuff that takes place int he gun industry. It's easy to see how the popularity of the Ruger has skyrocketed and the H&H is static at best.
I believe Ruger discontinued one, if not two models in the .375 Ruger
Ruger currently has 3 models chambered for the New King= Hawkeye, Guide and African.
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But I am sure the Mossberg and Savage variants will be wildly successful.... After all, when I think of guys who want to do Africa or travel to Alaska or BC to hunt that reload or don't mind tracking down expensive and difficult to find ammo, the first two manufacturers that pop into my head to supply them with rifles are Savage and Mossberg.......
You can get 375 Ruger ammo delivered with one phone call. Does that seem too difficult for you?
Lots of BC and Alaska hunters use Savage and Mossberg firearms. I know of more than one grizzly that have been shot with Savage and Mossberg firearms....................................
Truthfully speaking, it's a good cartridge, and as a guy that loves the Ruger scout / guide gun / Alaskan type platforms I think it would make a good combo....... but it's still an answer to a question nobody asked and has it's disadvantages over the H&H with few advantages that I can see.....
Mag capacity is typically one....... although I am sure at the Wednesday night meeting they would tell you just firing one round causes everything within earshot to run and drop dead at your feet......
One can never have too much ammunition, but a mag capacity of 3+1 is not uncommon for magnum cartridge rifles. The M70 H&H is 3+1 as well, whereas some Euro H&H's have deeper bellies on them and larger magazines for more ammo. But 3+1 still gives you twice the capacity of a double rifle.
Another (but to be honest, one I didnt experience when I tried one), is clunky feeding....... but I must say the example I fired didn't seem to exhibit it.......
A few years ago Ardent suggested that the Ruger wouldn't feed flat meplat bullets. So I put some flat meplat bullet shells into my 375 Ruger and made a video of me operating the action with ease, using just my finger and thumb. Theory shattered!!

We hear this "feeding" nonsense all the time and my response is always the same- they figured out how to make bottleneck cartridges feed a long time ago. It stands to reason that if the Ruger won't feed due to not having the long taper of the H&H, then NONE of the other cartridges that look similar will feed either!
I would be four-letter-me surprised if less H&H cartridges are manufactured and sold worldwide than .375 Ruger. I'd also believe in the US alone it's possible more .375 Ruger has sold in recent years as everybody buys a few boxes with a new rifle, and the rifles are in America's favourite flavour; cheap.
H&H ammunition actually should outsell the Ruger, as it's had a 100 year headstart, but not new rifle sales. New rifle sales of 375 Ruger are outpacing any other .375 caliber cartridge.