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Nope. Even said so on the box from that era: Click on the picture for full resolution.
"experience shows metal patched bullets are frequently responsible for barrel trouble"
I wonder what type of barrel trouble.
It could be early examples of jackets bullets were too soft, not too hard, and left extremely hard to remove copper fouling. I remember reading about Barnes X bullets when they first came out and copper fouling was an issue with them at that time. Rifles generate a lot more pressure and fouling but 100 years ago early FMJ bullets might have had similar teething problems.