What you could do:
-Open latest patch file containing DB tables (it's still patch6.pack today) with PFM.
-Select projectiles db table, right-click and select "extract selected". Make sure the file destination is your Shogun2/Data folder. There will be new DB folder created with subfolder "Projectiles_tables", and projectiles db file.
-Same thing with unit_stats_land.
-Select "New" in PFM File menu, creating empty, new pack file. When PFM asks which directory should the new file be relative to, select your Shogun2/data folder.
-Choose "Add Files", or "Add directory" and select previously extracted files, or whole DB directory (if there are only those 2 files)
-Now you can save the file in your Shogun2/Data folder.
-select "projectiles" db table, right click, and choose "rename". Change name to "myname_projectiles", where you can enter anything else instead of "myname" (but let it be simple name, no special signs included)
-same thing with unit_stats_land table
-save? I find saving often a good thing
-select your new units_stats_land table. Make sure that "Use First Column As Row Header" option is unchecked, slect all rows you don't want to change (by clicking on the empty, grey field on the left- it should highlight whole row), and delete them by pressing DEL key. Leave only those rows you want to change. In Your case: Inf_Missile_Bow_Samurai_Chosokabe
-Now, do similiar thing with your projectiles table, but leave only row with "shogun_arrow" in first column named "Projectile ID"
-in your projectiles table, change Projectile ID "shogun_arrow" to (let's say) "chosokabe_shogun_arrow".
Look for "Range" column and change it to your liking. If you want those Chosokabe archers shoot further, add desired value.
-go back to your unit_stats_land db table. Find column named "Projectile ID Ref". Your chosokabe archers now have "shogun_arrow" there, but you should change it to "chosokabe_shogun_arrow", or whatever name you gave in projectiles table.
-Select "Choose Pack Action" then select "Change pack type" ad choose "Movie" (you can select MOD too, but then you must edit "user_script" file to activate the file)
-save
This way Chosokabe samurai will have different bow range from any other bow unit in game. You don't have to make backups of any files, as you're not changing anything within orginal CA files and file size is minimal.
I hope it will help.
Godspeed.
What is that "unit range"? Where is that in unit_stats_land? What are you talking about?