Impulse · Calculator
Recoil impulse
Same math as the Impulse app. Caliber in, SAAMI free recoil out, then compare mil-spec, JP Silent Capture, PAMAX hybrid MBS, magnetic delay, and the 8-magnet prototype. The field does not erase momentum — it changes when the peak arrives.
Impulse
Recoil calculator
Pick a caliber and a recoil system. Free recoil is SAAMI momentum — bullet plus gas. The system does not delete impulse. It stretches the pulse so peak force drops.
Caliber
Recoil system
Staggered magnets + tuned spring. Commercial.
Rifle weight · 7.0 lb
- Free recoil
- 3.9 ft·lbf
- Impulse
- 1.30 lbf·s
- Peak force
- 290 lbf
- Felt vs mil-spec
- 76%
Shoulder pulse · 24 ms
Bolt race
Total impulse stays 1.30 lbf·s. MBS-C spreads it over 11.2 ms instead of 6.8 ms — peak drops from 383 to 290 lbf.
All systems · this load
Loads are typical published values, not a specific factory lot. Gas velocity is the SAAMI 4,700 fps convention. Felt % is peak force versus mil-spec on the same rifle weight — not a pain scale.