I went back at looked at my notes, my final loads for my hunt were 85 grains of H-1000.
It is over the published data of 83 from Hodgdon Data Manual.
I worked up from 10% below max and worked up the final load in half grain increments looking for accuracy (also potency) since I was hunting for moose in Alaska with Griz running around. There were no pressure signsEXCEPT FOR THE F UCKING GUN EXPLODING in the cases compared to the 83 gr load (no blown primers, splits, cracks etc.). I even had two other experienced reloaders look at the cases.
Also, since this was a single shot, I was not seating the bullet as deep, allowing for more case capacity… but I was not engaging the rifling. My loads did not exceed SAAMI PSI for the 300 win mag. They were at max but not over.
Sigh...
I have no experience with the .300 Win Mag, folks. What would a 2 grain overcharge do?
(Looking at current loads for the H1000 published by Hodgdon,the max loads for the 180 grain NOS E-TIP and the 180 grain SPR MT-SP are 79.4 grains compressed and 81.0 grains compressed, respectively.)
Looks like there was an extra .45acp charge of powder in there.
I'm still interested in knowing what parts failed.