It’s definitely not an exact measurement and I thought maybe someone here might have a better method than the one I was using. I’ve measured that bore a number of times and keep coming up with somewhere in the neighborhood of 1 in 48. This is the only place I have ever seen that references the GPR 54 cal.

”¦”¦”¦.except for one little 1 inch by 3 inch bit of text at the bottom of a full page picture add from a 1992 Lyman book which lists the Great Plains Rifle in 50 cal.

All of the publications I have ever seen listed the GPR as having a 1 in 60 for both the 50 and 54 cal. The barrel is stamped “GREAT PLAINS RIFLE” and it looks just like the picture in a 2005 Lyman catalog as well as my 1992 Lyman Black Powder Handbook. The verbiage about breaking the ice indicates this is the first 'Great Plains Rifle' Lyman offered for sale so apparently if there were 1:48 twist Great Plains Rifles, they must have been made after 1987. All metal surfaces sport a rich blue finish.

Overall length of rifle is 50' and weighs 9 lbs, This rifle is well put together and features a European walnut stock and all steel furniture. 50 caliber 15/16 inch across the flats barrel with 6 lands and grooves having a one turn in 66 inch rate of twist. Lyman's percussion rifle sports a 32 inch. Prior to the introduction of this Italian made reproduction, to obtain 'Hawken' styling this authentic required either building or purchasing a hand crafted copy. 'Lyman has broken the ice towards offering an authentically styled copy of the half-stock plains rifle at a reasonable price. It shows a Lyman Great Plains Rifle and the description says: To add some fuel to the fire, I'm looking at a 1987 Dixie Gunworks catalog. If I can think of any additional ways to muddle this I will! :redface: I built my first great plains kit in about '82 and the kit was somewhat older than that. If you have a handle on the rod of the type that will rotate, don't trust it to function as intended. It will need a half way mark on the barrel to get an accurate measure since anything faster than 1/32 will be somewhere less than a full turn. Once it is turned tight, draw it out carefully and measure the length of the rod that you are able to take out. Before you pull it out, screw the rod onto the jag since they often unscrew themselves going in as the rifling turns them. Follow the instructions about using a double patch or tight patch on a jag and push to the bottom. I think you are not getting accurate measurements. I don't think they ever made a 32' 1/48 barrel. If yours is a Great Plains with 32', then it is not that specific barrel. The 1/48 lyman barrel in 28' is for the Lyman Trade rifle. Lets see if I can muddle this up even more! :wink:

Lyman great plains rifle spare stock