Because I'm ready for some silliness, I give you the .950 JDJ. The rifle itself was made by SSK Industries and the carbine version weighs 50 lbs. Yeah, that's right. 50 lbs.
The cartridge throws a 2400 grain bullet, using 240 grains of very slow powder. The bullet generates 25,400 ft/lbs of muzzle energy and the other end generates 277 ft/lbs of recoil energy. Just as a metric toward a normal rifle, my.30-06 generates about 27 ft/lbs of recoil energy. So, touching the trigger on this thing is like my -06 times ten. Each round costs about $40.00 to produce and I bet that it could be a fine cast-bullet rifle as the muzzle velocity is only about 2100 fps.
I'll pass, thank you very much. I can't imagine a 50 lb carbine. If you listen to the video, current rifles in this caliber weigh over 100 lbs.