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Haven't worked on a 500 for a while, so my memory may not be accurate.
The bolt has a locking block that locks into a square hole in the barrel extension. Not much metal to support, so excessive headspace can develope, causing light primer strikes.
Inspect the locking block and barrel extension for signs of stretching. Verify headspace by adding masking tape layers on a shell's head stamp till action doesn't close. The thickness of tape layers is an estimate of excessive head clearance.
A stretched barrel extension can be fixed by threading it on the barrel by one more turn. A stretched locking block will needs to be replaced.
-TL
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