# Damper Selection

by livinskey
Tags: damper, muzzle energy, muzzle velocity, recoil
 P: 1 Hi , I am making a shooting rest for my high power rifle and I would like to have a damper take most of the recoil energy so that the shooting rest doesn't move back or up when shooting. I attempted to calculate what damper would be appropriate for this but I am getting results that don't seem realistic. For example, according to my calculations, a damper that is rated 100lbs and has a stroke of 7inches would only absorb 1.6% of the muzzle energy. A damper that is rated 250lbs and has a stroke of 17 11/16 inches absorbs 10% of the muzzle energy? I must be doing something wrong... Here are some numbers: Muzzle energy (of the projectile) 3502 ft-lbs. Rifle mass: 8 lbs. Questions? What size damper should I use? How much of the muzzle energy actually goes into felt recoil? What is the formula for multiple dampers and springs connected in searies or parallel? Thanks
 PF Patron P: 10,403 I don't think your muzzle energy will be 3500 ft lbs when calculating the kick of the rifle. A bullet weighs very little and will be accelerated to a very high speed, while your rifles weighs many many times that at 8 lbs. I dont know, but perhaps it is 3500 divided by the weight of the rifle??

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