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in Greybeard's account, the projectiles were full metal jackets

In Massad Ayoob's account, the projectiles were jacketed hollow points.

Maybe most 357 MAG SD ammo is jacketed, so it might not be a problem.

The Airweights apparently don't have this bullet creep problem. I've never had any issues with my 637. The alloy Airlite guns are about 2ounces lighter and, man lemme tell you, they certainly have much more felt recoil shooting the same 130 grain practice round. It's almost violent by comparison.

Now I'm beginning to wonder if there are any potential creep problems with the 357 rounds though an 18.5 ounce scandium/aluminum alloy Mountain Lite.

As I recall, the general consensus on this issue is to shoot only jacketed rounds from the ultra lightweights to avoid bullet creep.