Can Someone provide some Info on This .22LR?

[kemsobe]

Hey AO member, hope you're all well.
I'm sort of stumped and was hoping you guys can help me!
I was scouting recently for deer and moose in my favorite hunting zone the other day, and i wound up meeting a farmer while looking for permission. The gentlemen and i took sometime trading stories and eventually it came around to his tale of this bolt action .22 LR he has that wont shoot straight. He happend to have a piece of drywall handy that he has recently shot at with this gun, and so i examined it. The wholes left in this target were oblong and sort of ovalish. I figure this is most likely due to his rifling in the barrel being worn out or possibly clogged and the bullet is tumbling in the air. I aggreed to take it with me and see what i could do with it. He claims it's all he has for shooting coyotes. Anyways! I've been trying to pass a .22 wire brushes, patches, and even bore snakes through this barrel but theres a spot so built up in there i cant pass these through.. Should i try a .17 cal brush? I dont think a new barrel is an option because i doubt i'd ever find parts, the barrel stamp reads as follows Karl Burgsmuller Sen. Krelensen CAL 22 LR. I tried searching for information on google but turned up nothing close. Anyone know anything about this gun, or brand? And is there any other suggestions to clearing this barrel?

THANKS!