Description
We simulated two magnums side by side with the same 215 gr Berger Hybrid in 26" barrels:
🔹 .300 PRC: powder 100% burnt at 18.3". The bullet KEEPS accelerating on gas pressure alone. That flash? Hot gas igniting when it hits the air.
🔸 .300 RUM: still burning powder as the bullet leaves the muzzle.
What actually pushes the bullet is pressure, not the flame. As long as the pressure behind it beats bore friction and the air in front of it, it keeps speeding up.
In this model:
26" to 37" = 200+ fps gained
Velocity peaks around 11–13 FEET of barrel
⚠️ This is a computer-simulated example, not a measured test. Loads and numbers are modeled to show the concept. Your rifle, powder, bullet and barrel will be different.
Ever seen unburnt kernels on your bench? Tell us your cartridge and barrel length 👇
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