LJxxxxx,
Firstly nothing in those cases says hot. The radius of the primers are still round. Firing pin hole maybe a touch large as getting some primer back into it but not unusual.
Bolt not tight to open, primers not blowing out?
Stay with this 54.5 gn load or come back .5 gn if it helps you sleep.
2208 is very close to RL15 but I’d use the 09 or n160. N160 is slower than 09 so work up from 54.
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