1. Try the 308 in the magazine as is. I have 110 that started life as a 7 Rem Mag and now shoot 270 and 30-06. Feeds fine
2. Can't help with detachable mags.
3. No opinion on Hogue don't have one. I have a Boyd's aftermarket that I pillared.
4. The firing pin you have should work fine
Good luck
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