There's a two fold issue: one, ks combat changes the tank projectile, so your Canon behavior might not work as intended.
Second, it also modifies all ammo with the keyword 'magazine', which again, hits your ammo. While the first one might be acceptable, the second completly changes what it does.

Thanks for the report, indeed KS Combat changes a lot of weapon behaviour, I'll see how to improve compatibility, probably make it incompatible for now.

If say ask klonan to change the logic behind his changes. Limiting the magazine change to bullet type weapons (or at least to s:find("bullet") weapons) should at least eliminate the biggest issue, and the other one can be fixed by redefining your projectile during data-final-fixes.