People loading too hot initially is generally the problem, working up a load properly and keeping a 2/3 grain depending on case size below max is the way to go.
I think it would seal at neck shoulder junction anyway so you would be safe.
I was checking zero with a used rifle I bought and it came with loaded ammo.
I had a 5 shot group.
All 5 in the same hole, when I looked at the cases 1 had split on the neck where yours has.
Bore scoped it when I...
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