Jon -
When you look at the load data, the primary (most important) bit of information you are looking for is a load for ANY 9mm bullet 121gr to 125gr and its corresponding OAL, powder, and charge. The powder is sized to move a specific weight. The pressure depends on the relationship between the powder being specified, the amount of that powder, AND how much volume is inside the case, under the seated bullet... in other words the COL.
Secondly, you'd be looking at the bullet nose. For instance, a FP might use a slightly shorter OAL than an equivalent weight RN because the bullet is probably shorter itself... and the object is again to relate the powder to the case volume that is under the seated bullet. Follow? Stop thinking about where the nose of the bullet ends up, and start thinking about where the base of the bullet ends up!!
Thirdly, we look at the composition of the bullet. A FMJ typically loads hotter than a plated bullet, which in turn typically loads hotter than a pure lead bullet. So if the only load we can find for a 124gr LRN is a FMJ, then we can back off the max by about 3/10 gr or so and start there. To be exactly sure, look at the other 9mm loads in the manual. How much less are the matching loads for LRN bullets than the FMJ for the same OAL and your powder?
Yes, obviously for safety you want to find an exact match for your gun, your bullet, your powder, your primer, your case, etc, etc, but it can't always be done. This is where having a reloading library comes in handy. The closer you can start to your load, the fewer calculations you'll have to do. Since the most prominent safety concern is the "human element", then you want to reduce your calculations as much as possible. (Never, ever use a guess.)
So if you don't want to acquire more reloading manuals, then the only path you have is to buy only the bullets and powder mentioned in the manuals you do have.
I hope this helps!