I think I fixed it. There was a conflict in &Big_Shell_water_explosion in particles.dat. Open particles.dat with Silent 3ditor (v0.9.4) delete node 214 include children, then on what is now node 215 change Delete no children to true, and finally go to GlobalScaleFar and change DensityScale to "0.01". Splashes with big guns will now be visible beyond 4500 yards. Small guns already work right. It took me almost ten hours to figure this out.
