"What specific caliber? The 3" naval guns can reach about 16km (extended range to 20km.) 105mm howitzers can get to about 15km (extended range to just about 18km.) Russian and chinese 122mm can reach about 16km (21km assisted.) 127mm naval guns can get to about 24km unassisted (very few extended range shells have been developed for these naval guns, but PGMs reach well beyond 30km.) Russian-type 130mm naval guns can reach just over 27km (only known extended range range ammo is used in coastal mounts, not on ships, and can hit just shy of 35km.) 152mm and 155mm guns, depending on whether they are 39, 45, or 52 caliber pieces, get anywhere between 24-36km unassisted (reaching 30-50km with extended range ammo.) (I got most of this from a few Jane's Armour and Artillery encycs.) Barrel length and propellant charge (and resulting velocity), and shell dynamics (shape, weight, balance, aerodynamics), as well as gun elevation, will determine how far the shell will carry. The 2 range extenders are base bleed elements and rocket assistance. Base bleed elements are slow-burning material that eliminates or greatly reduces the drag on the tail end of a projectile (the base), allowing an improved range. But rocket assistance is just that: a faster burning and higher specific thrust solid propellant "chunk" that exerts considerable extra push to get the shell further away, but often at the expense of accuracy.."
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