After all of y'alls input I do believe I will switch to a different powder and primers.
That is always an option , how ever I'd want to know for sure what was going on or at least have reasonable confidence I understood what was going on before just moving on . That's just me though , I get very courses when things go wrong and I tend to go down a rabbits hole trying to understand why . Even when I've either moved on or the problem no longer presents it self I keep digging . My thought is If I don't know why it happened , I'll likely do it again at some point .
Unclenicks observation that Hornady is using the Winchester primers is a really good catch . That very well could be the issue with the lower charge .
Not to be a stickler but I'd like to look down this rabbit hole a tad more . I'd like to know if you have a bunch of unburned powder you need to clean out of the gun each time you get a squib as well as if the load that contributed to blowing up your gun is the same load in question here ? If "all" your problems have been with this load and this load only . I'd have I much easier time just scrapping it and moving on . How ever if this has happened using other components , I'd want to dig a little deeper as to what's happening .
FWIW - I believe what most of us want to understand and are asking in a round about way to be polite is , What is your reloading method , how do you charge your cases , how do you confirm your charge is in the case before seating the bullet , Do you use check weights to calibrate your scale , What scale do you use etc etc .
This is not to be critical of you but you're new here and we don't have much history on you . I/we want to be sure we can move past the possibility you're not making the mistake at the bench first so we can move on to more complex possibilities like the type Unclenick pointed out .
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