Add weight to the gun first off then let him watch you shoot 110 or watever light loads are available in .270 while he wears ear plugs and muffs.
Eventually he will express an interest in shooting it again, just make sure it's pleasant. I shoot a light .243 and I find it unpleasant off a covered bench so I can only imagine what an indoor range must sound like.
It seems like a big thing now but in 2 years you will both have forgotten it ever happened if it's not made into a big thing. My two cents Denis
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