HVP requires the projectile technologies within the railgun application and adapts it to fire from current U.S. navy 5-inch guns. HVP doesn’t get exactly the same pace and length railguns do—at Mach three they travel at about 50 % the velocity and at about 30 miles they only journey http://rain-guns64073.full-design.com/What-Does-rain-gun-price-Mean--30158202