As a side note I had the EXACT same experience with Walmart bought Winchester 17HMR ammo. Bought 500 rounds because they were $2 a box cheaper than every other 17 ammo I could find at the time. 1 in 10 fail to fire rate. Would USUALLY go off after removing/turning the round and having a second strike, but not all the time. Also had MULTIPLE failure to extracts in my BOLT ACTION Savage. Had to use a cleaning rod to push the case out, and my knife in the field several times. Rifle was clean, and has ZERO problems with CCI and Federal ammo. I hunt/trap with that gun and lost more than one animal as a result. Unacceptable and I will not buy Winchester ammo for rimfire again, Although I have had very good results with Dynapoints.