On Thursday I took my new M&P 15-22 to the range to test it out. After about 250 rounds of CCI Blazer, the bullets started keyholing. It was a very quick onset. One magazine went perfectly fine and the next one and every subsequent one keyholed. After 20-30 rounds of non-stop keyholing I called it a day and left. The guy at the range said a dirty barrel is probably the cause of the keyholing. It this possible? I was under the assumption that most keyholing is caused by bullet weight/twist rate mismatches. When I tried to clean the barrel after getting home it was FILTHY. The cleaning rod wouldn't fit for the last 2 inches of the barrel (I inserted the rod from the muzzle end) and even now after soaking for 48 hours in Hoppe's No. 9 solvent there is still one good chuck of lead stuck on the inside of the barrel.
Any tricks for getting stubborn chunks of lead out of a barrel? I'm not shooting this thing again until its clean because I'm sure its not good for the barrel. Needless to say I'm not using Blazer anymore since they make the gun inoperable due to lead buildup after 250 rounds.
Any tricks for getting stubborn chunks of lead out of a barrel? I'm not shooting this thing again until its clean because I'm sure its not good for the barrel. Needless to say I'm not using Blazer anymore since they make the gun inoperable due to lead buildup after 250 rounds.