Hey, S973.
As other posters have covered, if you want the guy to buzz off, there are plenty of reasons you can give. If you haven't seen him in 5 years, why would you care about how you come across to him? So he thinks you're a jerk, so what?
OTOH, what if you really do think he's a nice guy and want to help him out? Or maybe you think that him owing you a favor could come in handy sometime. For whatever reason, if you don't want to just blow him off, I think you've got some options.
First off, you bought your components at a time when they were readily available, maybe you even got a good deal on them. In other words, you provided then for your future needs or wants. This guy did not. So to be fair, whatever of yours gets used up for him, he should pay a price that reflects not only the increased cost of components, but the fact that to replace them (right now) you would have to spend lots of time scrunging them up.
Second, you also invested in all the necessary gear at a time when you could pick and choose what you wanted. That opportunity isn't available to him now, but that's not your fault. I guess what I'm getting at is, he's approaching you in a state of mild desperation and asking for a favor. Just because he's desperate, brought on by his own choices, doesn't obligate you to compromise your situation to help him.
Third, you might look at what other obligations you have and see if you can reasonably invest some time and effort to help the guy.
Four, you don't want to end up in a situation where you've got a lot invested and he's got nothing, so at each stage of the process, you want him doing his part, and preferably a little bit more.
Okay, so if you still want to do something for him after all that (and you already have the dies etc. to load what he wants), here's how I would go about it.
"Hey, Biff. S973 here, how's it goin' bud? Hey, we talked the other day about reloading together, and I think there's a way I can help you out some. It may not be exactly what you wanted, but here's what I can do for ya.
First thing we do is make a list of the powders we have load data for, what size primers, what weight bullets, etc. Then we find all the sources of ammo and components in the area, and you put them on speed dial and call them every other day or so and ask for what you want. All the shops, not just the cheap places like Walmart. It's too late now to be picky over a few bucks, so even if they only have a hundred large pistol primers, you head over and pick 'em up. I know, it's a hassle, but it's better to get your components little by little than not at all.
Next, you've been saving all your brass, haven't you? Shiite, man. That's the only reusable part. Okay, when you go to the range, look at what other shooters are shooting. Ask if you can gather up their brass when they're done. Ask the range officer if you can buy fired brass in your calibers, even if it's only 100, it'll help.
Meanwhile, Biff, here's what I'll be doing. I really don't have enough components set by for you and me both, but I'll call my gunny friends that reload and put out the word on what we're looking for. If they call me back and say, "Okay, I can spare you a pound of Unique (or whatever)," you and I beat feet over there and buy it. You're the new guy, you're just getting into reloading, thanks a lot Gunny for helping us out with that.
Now, here's the thing about reloading. You don't just stuff powder in 1000 of something and call it good. What we need to do is look for some commercial "duty" rounds for you to CCW with, and we try to approximate that in our reloads. We want to tailor the load to your gun. We load 50 rounds and then go shoot them, then we load 50 more with 1/2 a grain more powder and shoot those. We change bullets and powder and crimp until we find out what your guns like to shoot, and then when we're ready to load 1000 of them, we're pretty confident that they'll work.
Thing is, Biff, I can't legally reload for you. What I can legally do is show you how it's done (while eating your pizza and drinking your beverages), and help you do it, and you'll be building knowledge and experience for when you get your own reloading gear. If you just want a big swat of ammo, get in line with everybody else. If you want to learn about reloading, I can help you, but there's more to it than most people think, and you have to consider it a learning experience. Anyway, think that over for a week or so and let me know, okay?"
That will show you if he's serious about reloading or if he just wants a back-door source of ammo. My personal feeling is, in this situation, your time is at least as valuable as his, so don't get suckered into doing all the work and him getting all the benefit. And I sure wouldn't use up my components hoping he will replace them someday - the market is too volatile right now, and might be more in the future.
But if he digs in and comes up with some stuff, and learns the basics, you may end up with a good reloading and shooting partner. Really it's up to you whether to extend the offer.
Parker