Someone here is smoking dope.
For $395 - you can buy a top of the line reloading press, the dies, the bullets and powder and a box of primers and reload your own shells.
If everything is according to Hoyle with your gun, it should already be shooting the heck out of the bulls-eye - as long as there is nothing wrong with the trigger or the scope or the scope mounts.
You told us the whole life's story about the gun, but said absolutely nothing about the optics or mounts. Open sights for me is no longer an option. That went out with the Hula Hoop and long hair - a long time ago.
The goal of the reloader is not always to produce a cheap round, but to produce a round that works best in your rifle.
Again - you told us the guns whole life's story, yet did not produce one factual amount of information as to which rounds you were shooting, manufacturer, bullet weight, nothing.
As much as anything, I suspect that someone here is just trying to round about advertise for the merchant that you just named, and not really trying to find a solution for your problem.
Now we are right back to where we have started, because you said you have a 7MM Magnum - and that doesn't tell us anything either.
It could be a 7MM RUM, 7MM Remington Magnum, etc....
Usually what has to be done is to buy a reloading manual and look at the recommended load and bullet for that caliber of gun.
Look at the maximum and minimum load. Start out somewhere in the middle between the maximum load and the minimum load and work your way up to where the gun shoots best - about 1/10th of a grain at a time. Shooting 5 shot groups, until you find the load that shoots best for your situation.
At the same time, if your 7MM calls for a 140 gr bullet and you are trying to shoot a 170 gr bullet, you cannot expect your rifle to be a tack driver.
I have seen this same scenario play out at our rifle range 100 times with people who owned a .270 and tried to shoot 150 gr bullets, people with 30-06's that were trying to shoot 180 gr bullets and people with .35 Remington's that were trying to shoot 200 gr bullets.
The gun was a good gun, the scope was a good scope, the round was a good round and yet the bullet wouldn't hit the target two times in the same place.