The Hawken rifle is built from parts from Track of the Wolf's Jim Bridger Hawken. It is patterned after a c. 0.50 cal. 1850 Hawken Bridger sold in 1865. The original has a 1 1/8 x 33 1/8" barrel. Mine is 34 5/8". Mine was originally 0.54 cal., the minimum in Alaska for most big game animals. First built in 1993, I shot it out and had to re-bore it last year to 0.58 cal. I am shooting a 0.57 Hornady Premium Swaged roundball with 0.017" pillow ticking patch on top of 110 grains of FFg Goex black powder.
I thought the Longhunter record book listed a .54 caliber next to some of your entries so I'm assuming it's the same gun? Man that's ALOT of shooting to shoot a gun out that you need to have it re-bored! Awesome looking rifle!