CVA (conneticut valley arms) made (imported) a .58 hawken many years back. The AB date code would make it a 1976 manufacture.
The American Snuff Co.
Yes it is, it uses a .30 caliber bullet which makes it a 30 caliber
Rossi
Marlin makes one in that chambering.
North American Arms
The caliber of the bullet is 7,62 mm. And shoots the 7.62x54r ammo. That makes it a .30 cal.
The name of the rifle is Hawken, after the original makers, Samuel & Jacob Hawken of St. Louis MO. The name became used by other companies making a rifle that was large bore (.50 or larger) with a half stock, and set triggers. Many companies make, or have made, a Hawken style rifle. However, the "in line" muzzle loader rifles have reduced interest in traditional side lock rifles. You may want to check on line gun auctions, such as auctionarms.com, or gunbroker.com for examples. MY Hawken is a Thompson/Center "Renegade" .50 cal- and it is a great shooting rifle.
Yes, colt makes a few different versions of the 22 caliber handgun such as the Woodsman, and Challenger.
Both Shinsung and Sam Yang make a 50 caliber air rifle. The largest caliber Weinrauch makes is a .25 caliber.
.001 inches. Makes a difference depending on what you are shooting, how old the barrel is, etc..
Usually a custom job these days.
The ONLY .35 caliber pistol I have seen was the Smith & Wesson .35 Automatic. This is a rare gun, and was only made 1913-1921. Sure you don't mean a .25 caliber pistol?