You seem to be missing it or maybe I am missing what you are asking. If a round just sits in a pistol without being unloaded and loaded again the next day and without that sequence being carried out every day over the course of months, it probably cannot cause the supposed primer problem and is unlikely to cause the unseating problem (but that probel is possible after only a few times of reloading the same round into the chamber). But if you do unload and reload using the same two cartridges every day over the course of moths you are asking for problems. Thus, the reason some people wisely change the top two rounds is usually because they unload their pistol at the end of their day then reload the pistol the next day and are in the know this can cause the problems described (at least the unseating one as far as I am aware and maybe the primer one too). If you do that repeatedly over time, and only use the top two rounds in the magazine during the unloading and loading, it can cause the problem of unseating the bullet and pushing it to far into casing that it causes problems I mentioned above. Now, or since 2012 or there about, it seems another problem was mentioned caused by that same repeated sequence, the primer compound is loosened resulting in failures to fire.again i would love to now the science or data behind the reason for that
what would you think could change in 3 months by sittin in the top round that the rest of the rounds have not changed
If you just let the pistol lay around without unloading /reloading it daily (with the same rounds) there is pretty much no reason to change the round just for the sake of changing it. The thing is - are you really going to leave a pistol or other firearm loaded for 3 months and never clean of otherwise maintain it in that time? That too can cause other problems. Just reloading it a couple or few times with the same two top rounds - the one in the chamber and the top round of the magazine - can be enough to unseat the bullet and push it enough into the case as to cause a potentially dangerous situation.
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