Greetings Gentlemen,
The Jonathan Browning Mountain Rifle and Ithica Hawken are not the same rifle. Having owned several of each and having them apart (locks) for internal polishing and tuning, I can definately state they are not the same. Even the rifling twist is different. The Browning was made in 45, 50, and 54 caliber, and each caliber had its own rifling twist rate:45,1-56 50,1-62 and 54,1-66. Groove depth was .010" -011" deep. These were and definately round ball rifles and all I have were superbly accurate. In 50 caliber, .495 balls were very accurate; consistent 1" groups at 50 yds off the bench with factory open sights. Cast, weighed .500 balls would shoot into smaller groups. Of course the bore was wiped between every shot. The rifles were available in brass or browned steel furniture. Having seen very few brass furniture Brownings, I believe most were manufactured in browned iron. The brass ones might have more collectors value today. Two years ago, I sold my NIB Centennal model for $1200. Alas, I am now down to 1 50 caliber Browning with a spare 45 caliber barrel. My wife has said it not for sale EVER, since it is the she learned to shoot with.
it is my opinion the JB Mountain Rifle is the finest quality, most accurate factory produced, over the counter, out of the box, traditional round ball muzzle loading rifle produced.
Having shot ML rifles for 51 years in competition and for hunting, I am still using black powder. I do not know of a single serious winning competition ML shooter who uses anything other than black powder. My deer and wild hog 50 caliber JBMR hunting load is 85 grains of 2FF black powder with a .500 cast lead ball. This load produces 1" c-c 5 shot groups off the bench at 50 yards with the original factory open sights. The bore is wiped between shots.
Hope this will answer some of the questions and speculation
about the JB Mountain Rifle. If any of you have a chance to get one at a good price, in good bore and outside condition, do it. And one thing, the JBMR has a good single set trigger.
Best Regards, John L. Hinnant-New Member