Log Cabin sells a sheet steel nose cap (#52EC9) for $10.10
"Formed from 18 ga. sheet steel. 1-7/8" long. Flat, low profile. Cut for 3/4", 13/16", 7/8", 15/16" or 1" barrel. From Ted Cash Manufacturing."
http://www.logcabinonline.com/index1.htmlPut the item# '52EC9' into the search phase box in the upper right hand corner of their webpage and it'll be the first item on the list.
Most other M/L suppliers sell nose caps in steel though not as many varietys generally available as in brass and G/Silver.
,,,,but making one would be a nice project in itself!
Good luck with your make over on the rifle.