Have you had any instruction from an experienced reloader???
Seen one rifle (308) blown up 'cos the reloader followed all the instructions but over-crimped the bullet. (he was a big lad and didn't seem aware of how tight the bullet crimp should be!!!)
Examine (immediately after firing) all your fired loads for signs of over-pressure & head-space issues.
Good luck.
Pistol & Rifle Shooting in the Highlands with Strathpeffer Rifle & Pistol Club. <StrathRPC at yahoo.com> or google it.
No longer Pumpin Oil but still Passin Gas!