I finally got my late father's Winchester/Miroku Model 52 back from the shop where he had it for sale and took it to the range to see how accurate it was.
I had a wide variety of cheaper .22 ammo on hand, and found some smoke-damaged boxes of Eley Match and CCI CB Long ammo in his reloading room.
The gun was doing OK, and the Eley Match got a decent 5/8" group at 55yds. I then loaded the CB Long, and when it fired, it sounded like a cap gun and I literally saw the bullet come out and hit the ground about 15yds away.
I decided not to shoot any more of it, especially in such a nice rifle.
I've never used CB Long before and never heard of it, but my dad has a bunch of it. Does anyone know what the purpose of it is and if that first shot could have been a fluke?