I don't use your software, so all I can do is describe the basics.
If you can find a 'telephone' filter setting, try it first.
If not, first pass the audio through a 300Hz high-pass, an 18dB/octave slope is fine.
Then pass it through a 3000Hz low-pass, 18dB/octave.
Next, normalize the amplitude to 100%
Apply a 50% clip.
Pass through a 3000Hz low-pass again.
The last step is optional, pass through a 3000Hz highpass, 6dB/octave. Some radio coms have this sort of tinny filter applied so the voice is understandable in high ambient noise conditions, like a ship's engine room.
Artillery is just fireworks booms, downshifted a half octave or more and amplified a little.
Fav quote - "Experience is whatcha don't get 'till ya don't need it no more."
System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70