It is true to say the HMR ammo has certainly had its issues, I have had well over 200 split cases at firing (probably a lot more I haven't noticed).
One or two delayed ignition, probably less than 1/2 second but seems an eternity. Never a squib, YET, and never lost a shot/quarry from the issues.
It isn't good, no argument, and there is a suggestion newer ammo has improved, just the same, my HMR is very important to me and staying put!
Not experienced the issues in OP but have used Hornady V-Max Blue/Red almost exclusively for years now!