17 Mach2 ammo perhaps, there is no way that a 17HMR will chamber in a 22 LRCustomer buys a "high end" 22 LR bolt gun. Doesn't buy any ammo.
Brings the gun back the next week complaining that it wont keep hits on a paper plate at 25 yards and when they do hit it looks like the are sideways.
Gun store owner, a Viet Nam era Marine, asked to see the ammo he was using.
.... wait for it.
It was 17 HMR.
drover