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So in summary, the 375 Ruger has 6% more volume. In a Ruger rifle is is lighter than the 375 H&H in a Ruger rifle. The 375 Ruger doesn't have a belt, so it's prettier I guess as I don't know why having a belt is bad. Old I guess.
Belts aren't bad, they are superfluous. The Ruger has no superfluous belt.
The 375 Ruger is a shorter casing, so it can be used in shorter actions
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Which is a benefit to the Ruger.
Performance between the two is close enough to call the same, however the Ruger offering does offer a slight advantage here, not enough IMO to make any difference on game or paper within normal distances
That was one of the reasons for the Ruger- Long barrel H&H velocity in a short barrel.
. Both ammunition and brass is less available for the 375 Ruger.
Luckily, anyone with a telephone, a computer or a good relationship with their local gun store can get brass
I don't see much difference in rifle costs, as comparable rifles in either cost about the same. Maybe in Ruger, I haven't checked Rugers H&H rifle, I was comparing rifles like winchester, browning, etc...
Cost difference in Ruger rifles is quite a bit. In other rifles there is often an extra cost for the H&H over a 300WM for example.
Does the different casing reduce throat erosion?
Throat erosion is not controlled by case shape.
Are there any other benefits to the Ruger over the H&H?
Been listed over and over....H&H performance- more compact rifle, less case trimming etc etc etc....Lots of threads to search this out on. You've been asking the same question over and over.
Is there another casing that can be formed to the 375 Ruger?
Probably not. The same can be said for the H&H.
Will one or the other perform better with longer/shorter bullets? Does one give us more option concerning seating depth? (I think that has been answered, but it was rifle specific)
I've used 220 up to 350gr bullets in the Ruger and they get good accuracy and good velocity. Some people have suggested that the Ruger won't work with heavy bullets due to the shorter case, I find this to be misleading. You may have a long throated H&H that you can seat bullets out farther, but it doesn't mean you are getting any real edge. Just means you have a deep throat.
I haven't tried 380gr bullets in either cartridge, and probably won't as I don't see much use for them. I'm not sure what the concern with seating depth is. A properly chambered rifle in any cartridge will not have seating depth issues at all. Seating depth is usually experimented with to get better accuracy. The 375 Ruger cartridge is certainly accurate enough. Some guys think that seating the bullet out a bit to get a couple more grains of powder in is an asset, but for the minimal amount of velocity gain you get, it's never been a big deal to me.
I am not trolling, attacking, flaming, or baiting. I am curious.
For someone so "curious" I'm surprised you haven't gone and done some more research, as all this information has already been put down on CGN and everywhere else on the internet.