Assistance to identify rimfire round

I bought some rimfire rounds from a fellow who thought they were “Forehand & Wadsworth” .41 rimfire." I have not been able to find anything to confirm or deny this in the books I own. I would appreciate help both identifying the round as well as any insight on what book the information came from.
Thank you!

P1120233 P1120234 P1120240 P1120241

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On the basis of the measurements shown it; ‘might,’ be a .42 Forehand & Wadsworth, applying your measurements to: The Rimfire Cartridge in the United States & Canada by John L. Barber.

From the John L. Barber data the following should also apply:

Rim: From .475 to .494
Head: From .417 to .420

Sma3

Rim: .488
Head: .420
Thank you Sam, I will look a copy of that book. Does it mention who might have loaded it? I am also curious to know what F&W arm was chambered for it.

Some additional background Ref: The Rimfire Cartridge in the United States & Canada by John L. Barber.

F%26W-1

Sam3