This may only be of interest to me, but... Three or four years ago I didn't buy a very nicely restored Winder Musket at the Tulsa show because it had been rechambered from 22 Short to Long Rifle. I think this has been done to quite a few nice old gallery rifles and I wasn't sure the original slower twist barrel would be accurate with the available modern ammo.

This morning I was driving by a Bass Pro Shop, and went in to see what they had on the shelf in 22LR ammo. It wasn't much, but they did have both single boxes and bricks of Australian manufactured Winchester 22 Long CB-Match with a 29 gr. bullet. I paid the reasonable sum of $4.00 for a box. The Winchester part number is: X22LRCBMA. If you have a rifle in 22 Short which has been altered, this might be exactly what you need. I used and liked some of the Australian manufactured Winchester 22LR match ammo ten or twelve years ago, but then it went away.