Look at the ammo. It should look good almost as good as new.
If the loader listed the load data check it out and see how it agrees with a loading manual. If he doesn’t list the load, I would be inclined to reject it.
If you know who loaded it, just how much do you trust hims?
Learning to load is not very difficult but you do need to be careful.
I do not personally know the guy who loaded it. I believe he owns or manages a gun range in Decatur, TX. A trusted friend knows him and buys from him regularly. I will request the load data. Thanks!