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There a couple factors. Powder lot, temp, but mostly case capacity.Wait a sec...The math aint mathing...
Using Hodggon Reloading site for H4350...It says 143Gr ELD-X for 6.5 Creedmore has a min of 35.9 to max 41.8 giving pressures of 44,700 to 61,200 respectively with OAL 2.800. I do question the 2.730 OAL and that may contribute to more pressure but I cant imagine that it would destroy a rifle like that.
That being said...none of these loads based on what you provided would have had that type of detrimental failure...provided it is H4350.
There has to be more to the story...
You could probably weigh them with a precision scale to find the empty ones.I have an uncle that reloads, he is getting up in years (78-79 yrs old) and has always been overly anal about his reloads. I visited him last year and he gave me about 150 rounds of .45 and 150 rounds of 9mm. As I was walking out the door he said "By the way, you should use those for target practice, I realized after I spent the day reloading rounds that I forgot to put powder in some of them!" LOL. Needless to say, the rounds he gave me are in pristine unfired condition!