Thank you. The cartridge is called 11.7x51R. Think of a 45/70 case about .1" shorter in length and a bit fatter (about .02") with a mild taper going to the case mouth. The groove diameter on mine, as best I can tell with its 5 groove rifling, is .462". My cast bullets are .463", which is why I pan lube with no sizing on them.
The breech block has 2 firing pin holes. Originally it was rimfire, and the Danes converted them to centerfire starting in 1896 and re-issued them to artillery and coastal defense units while the infantry was being issued Danish Krags in 8x58RD. The firing pin could be reversed to shoot leftover rimfire ammo or set for centerfire to use the new more powerful centerfire round. The rear sights were redone for the longer range centerfire ammo. I suspect mine was not re-issued as the brass unit plate on the buttstock is not unit marked.
So far I've not found velocity info on the original 11.7x51R full metal jacket 385gr centerfire military round. Did find the earlier military rimfire round was a 385gr lead bullet at 1250fps powered by black powder. I approached the reloading by using mild smokeless reloads designed for Trapdoor pressures in interest of low pressures and milder recoil. Tried 7 different loads.
