1. Yes, you could have sustained a double load. Most wheels guns are highly tolerant of high loads. This doesn't mean purposely overload, but generally a revolver will take a lot more punishment than an auto.
2. I'm not sure on the primer, but I know the reasoning behind many primer differences his blow out pressure. A small rifle and small pistol primer burn similarly; but the rifle primer has a thicker cup to contain higher pressures.
3. From what you say, the gun seems fine. I would try some light loads out first.
Accidents can happen to anyone; and most people who have been reloading for a long time have had one. I haven't yet; thank God. I'm glad you're okay too.
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