First of all thank you so very much for taking the time to help me Polka_37, I'm kinda of a dummy and did not realise your the mod author until I was in factorio's mod manager and noticed your name was on Krastorio :P, so thanks again for helping me with this :)
I had some what of a learning curve as I have never modded factorio before and had some stumbles so I'm going to explain what I did in detail so if some one else wants to do this they can follow in my footsteps.
So I did find weapons-realistic.lua and with the find function in note pad I found the Cannon Range modifier and was able to change it all from 50 to 70, i tried saving my changes directly but windows would not let me as I was working with in an archive so, after making backup (yes I should have started with that) I unpacked the mod folder and made my edits to the file, there was a small issue when I repacked the mod folder as a .zip it broke then entire mod :P, so I got wise and copied the updated file right to the mod archive with out unpacking it and that did not break the mod.
Unfortunately when getting back in to my game I found nothing had changed Cannon Ammo was still at 50 range, I figured there was a value I missed so I started snooping the mod file and while looking around the folder I found another file: ammo.lua and figured I would take a look, and sure enough the Cannon Ammo Ranges were there too, figured this is what I was using because I turned off Realistic Weapons in the mod setting so I modified this file instead and restored the weapons-realistic.lua, upon relaunching the game I had success all my cannon ammo was now set to 70 range and in a test I lured some bugs to my walls and the shells were able to make the max range of the turret (65) which pleased me greatly.
So I am now thinking of modding weapons-realistic.lua and seeing if I can get the bullets to travel alittle farther with the cannon shells as I did like the realistic weapons that Krastorio came with but for now I'm going to stop while I am ahead before I really break something.
Thanks again Polka_37, this is the first time I'm playing Krastorio and I am very much enjoying it and your help with directing me was invaluable as I would have never figured this out on my own so thanks again.
I'm going to give a direct break down of what I did so if you want to do it too hopefully this helps:
Turn Off Realistic Weapons in Factorio's mod settings and exit the game
go to C:\Users*****\AppData\Roaming\Factorio\mods\ and find Krastorio2-spaced-out_1.6.18, make a new folder called backup and copy Krastorio2 in to it, unpack Krastorio2, then navigate to Krastorio2-spaced-out-1.6.18\prototypes\updates\base and edit ammo.lua in note pad, search Cannon until you get to this:
data.raw["ammo"]["cannon-shell"].ammo_type.action.action_delivery.max_range = 50
data.raw["ammo"]["explosive-cannon-shell"].ammo_type.action.action_delivery.max_range = 50
data.raw["ammo"]["uranium-cannon-shell"].ammo_type.action.action_delivery.max_range = 50
data.raw["ammo"]["explosive-uranium-cannon-shell"].ammo_type.action.action_delivery.max_range = 50
you now can change the ammo range from 50 to what ever you would like.
Now save the file and copy it, your going to go back to AppData\Roaming\Factorio\mods\ and now open the Krastorio2-spaced-out_1.6.18 archive with the widows explore, navigate to \prototypes\updates\base inside the archive, once there paste the modified version of ammo.lua and replace the original, launch Factorio and your cannon ammo should now reflect your changes.
This can be done for the realistic weapons no doubt but there is alot more variables if you want to modify the bullets too and I'm not sure what does what right now but the cannon shell ranges are laid out the same so should work the same for them there too.
Thanks for all the help and I hope this helps anyone down the road too.
EDIT: Just wanted to add I have this working for Realistic weapons too, the cannon ammo is the same, for bullets you just need to change the "rifle_range" value as everything references that