I am also a great fan of the 7x57mm Mauser cartridge. It's probably my second most favorite cartridge, immediately following the 6.5x55mm Swedish Mauser.
I must admit that, 30 years ago, I would never have thought that we'd see the day when several American rifle manufacturers were chambering rifles in 6.5x55mm and none were chambering in 7x57mm...
Then again, if I was good at predicting future events, I'd be a wealthy man.
A fairly large number of rifles were sold in the US in 7x57mm not that far back in time. If you keep your eyes open, you see them come up for sale every once in a while.
I have a Ruger M77 Mark II in 7x57mm. Many years ago, Ruger ran a short production run of M77/MKII RSI rifles in 7x57mm. They were very nice rifles and, being somewhat stupid, I failed to buy one. A friend of mine (being somewhat smarter than me) did pick one of them up, something he manages to remind me of every once in a while
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For a while, Winchester offered their Model 70 Lightweight in 7x57mm. I've never been a fan of the W70 Lightweight stock, which had a fore-end that was too short to my eye. I did pick up one of the Winchester Model 70 Featherweights in 6.5x55mm, and was waiting for Winchester to offer a standard Model 70 or a Featherweight in 7x57mm. If they did do that, I certainly missed the boat. Bummer...
Even farther back in time, Interarms offered the Yugoslavian Mark X in 7x57mm, both in standard rifle and fullstock versions. They even offered a fullstock version with a butterknife bolt handle. Of course, I didn't buy one of those either. Bummer, again...
Over the years, several other rifles were offered in 7x57mm in this country.
I guess that my point is that the 7x57mm Mauser cartridge is a great one, and one that will beat many of the more recent offerings if loaded to it's full potential in a modern action. As browningguy says, many of the more modern 7mm cartridges just allow manufacturers to sell people additional guns...
And, if you keep your eyes open, 7x57mm rifles are there to be found. However, you do need to keep your eyes open because anyone with a 7x57mm rifle will have probably realized what a gem they have and will rarely part with it...
Forrest