Quoted: DO NOT FIRE a round when the bullet has has been pushed back into the case. If you can see the difference in the over lenght of the cartridge is shorter, then the pressure when ignited is going to be much higher then normal and that cartrige is already pushing 50,000 PSI.
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I'm curious about this and other comments regarding pressure. Please note that I am not advocating use of a damaged cartridge and I'm not a reloading expert. In the interest of seperating fact from fiction, this is my understanding:
Myth #1 - A bullet seated too deep increases chamber pressure.It is my understanding that a bullet seated lower in the cartridge will effectively reduce the pressure rather than increasing it. This is because the bullet has more room to accelerate before it reaches the lands of the rifling.
Myth #2 - A bullet seated too deep increases the likelihood of catastrophic detonation. Decreasing the unused space in a cartridge by seating a bullet deeper will DECREASE the likelihood of detonation, particularly in cartridges that are marginally filled with powder (i.e. many subsonic rounds). The rule of thumb I've heard is never fill a cartridge with less than 30% of the appropriate powder. Also, there are several reloads where the seating of the bullet results in compaction of the powder charge.
If I'm wrong, please say so and back up your information with credible sources. I get the feeling that many of the prior responses are based on unfounded assumptions.