I have had bad factory ammo from Winchester (shoulders not sized properly - would not chamber, 11 out of 20 rounds), Nosler factory ammo in 308 (same as Winchester, 4 rounds, shoulder not sized right failed to chamber). Remington Core-Lokt (before Remington went bankrupt) had two different lots blow the primers out the back of the case, other rounds in the same box had burn marks around the primer after firing. When I called Remington to complain - They knew these were bad lots by the lot #s, but there was no recall. Remington replaced the bolt on my R700 rifle due to damage to the bolt face caused by the one round that exploded the primer out the back end. I got powder burns on my face from that one - Luckily I was wearing safety glasses. A hunting buddy of mine had a Winchester silver-tip factory found that misfired when he shot at a deer: The round went poof and the bullet dribbled out the end of the barrel and fell to ground. Made enough noise to scare the deer away. Moral of the story - Always test chamber ALL rounds in the box on factory ammo. before you go hunting to see if the bolt closes properly. Test fire some to make sure no issues. Accuracy - The belted magnums are typically the hardest ones to find accurate factory ammo. For the 308 use case - Lots of choices. I would agree with Norma - Brass and ammo. are much better quality.
