You've asked a good question whose answer has legal implications under both "tort" and "equity".
First of all it is illegal to "sell" ammunition that you make without a specific license to do so (I'm personally glad that such is required, aren't you?).
Secondly, if you "sell" ammunition that you make / reload, even if the person acknowledges and accepts their responsibility for any problems,
their surviving families and lawyers will come after you.
Thirdly, "Trade", "Barter", "Exchange", "Sell" are usually considered equivalent transactions. Even "Gift" can be problematic!
I have exchanged reloaded ammunition with experienced re-loaders that I know and trust, but that is not a frequent activity and not done
without due consideration! Mostly, it is done with the specific understanding that the ammunition will be "pulled" and then reloaded by the person accepting it.
Ask any experience re-loader whether or not they have ever had a "squib" or overcharged load ... Experience re-loaders are always checking their loads for signs of such, even with those
loaded by the major manufacturers! Especially when loads are at MAX, a "Safe" load in one firearm, may be "Unsafe" in another ...
This should go in the Sticky: Rules and Guidelines or Reloading Questions. Well Put Clarke123!