They may be out there--but I'm not sure I'd want to routinely reload my rifle cartridges with nickel-plated stuff. I'm no expert--but here are my opinions:
The nickel-plated stuff makes sense for straight-wall pistol reloading because it's more weather resistant than conventional brass (think continuous outside belt-carry) and cylinder tolerances make over-all case sizing not as important as it is in resizing rifle cases with shoulder, head and neck flow issues. Some say nickel-plating tends to be more brittle--I don't know if that's been conclusively proven or not.
That said--I think some of the premium case makers such as Lapua put a mix of nickel (or zinc?) in the neck/shoulder area of their brass to strengthen that area. I find investing in these kinds of cases well worth the extra expense in the long run.
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