By default, only 9 kinds of weapon range is recognized(1-1, 1-2, 1-3, 2-2, 2-3, 3-3, 3-10, 3-15, MP/2). While it's possible to use the other range, the range name and tiles won't show properly. This patch will fix them. I don't know why the developer team is using longer, yet less effective code.
This patch was created using Lunar ips. Using this patch together with another range modifying patch (i.e. Blazer's 2-3 range sniper patch) is not recommended.
For FE7, you can download the patch here.
For FE8, you can download the patch here