I have a similar dilemma.
I bought a pistol and the owner threw in 100 handloads, and I bought another 100 from him.
I had a kaboom that blew debree into my face and the mag out of the bottom of the gun.
I was not injured, but thankfully wearing glasses.
Later, the gun malfunctioned and froze up completely, possibly due to the kaboom.
I did take it apart and managed to get the gun functioning again at the range.
I spoke with the seller and he also had a kaboom with his reloads!
I fixed the gun but now deciding:
1) Whether to take it to a gunsmith to have him examine it;
2) What to do with the 50 or 100 rounds I have;
I think I'll end up coughing up the money to have the gun examined. Although it appears fine, I should just be certain.
As far as the ammo, I can either shoot it, give it back to the seller (possibly ask for my money back on those reloads), or keep it for a much more desperate time (like a barter item in a TEOTW scenario).
Bottom line, we're talking probably a $20 loss on the ammo. No big deal and not worth injury or real damage to the gun.