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I've chambered the same round (M885) everyday in my work rifle (colt/SBR) for over 6 months. It definitely dimples the primer, but I've never had an AD/ND. I switch it out not for the dimple but because the case or projectile itself gets scuffed up over time. The 6 months was the longest I've gone, but I have been doing this for close to 15 years.
I used the same (numbered) mags in my kit to load/unload everyday. I have heard plenty of times about someone who knew someone who had an AD/ND from slamfire, but I've never spoke to anyone it actually happened to.
Muzzle awareness is key.