Exiting the 26-inch barrel of a Winchester Model 70 Extreme Weather at about 3,260 fps, it impacted with about 2,800 fps remaining velocity
and around 2,600 ft.-lbs.
In my experience, SP bullets will expand reliably down to about 2,000 feet per second (fps) of remaining velocity
. Much below this and they will act like an FMJ.
According to the Hornady Ballistics Calculator, given that bullet weight, velocity, and a ballistic coefficient of .170, at 800 meters the bullet has a remaining velocity
of only 523 fps and energy of 75 ft-lbs.
Present investigation reveals that the couple stress parameter A and disk rotational parameter a have the same effect of increasing radial velocity and decreasing the remaining velocity
functions with the increase in respective parameters.
Since velocity is an important factor in the wounding power of a bullet, an answer could be found if the remaining velocity
of the components of the soft-nose bullet, like the lead core or the jacket fragments after perforating the glass, is known.
Consisting of over 400 tables, graphs and examples, FSI's book plots various pellet trajectories from 5 to 75 yards for zeros at 10, 20, 30, 40 and 50 yards -- plus it includes wind drift, time of flight, and remaining velocity
It also computes all necessary external ballistics based on an instantly changeable zero range -- data such as bullet path, wind deflection, remaining velocity
and energies -- then computes a "power factor" based on momentum.
Fired from a Winchester XPR rifle at 2,325 fps, it impacted the straight-facing buck with an estimated 1,850 fps remaining velocity
and around 1,150 ft.-lbs.
Using the vintage Powley Ballistics calculator, I fed it the BC and muzzle velocity from above to get a remaining velocity
at 500 yards of approximately 1,540 fps.
The other columns show remaining velocity
in fps and bullet drop in inches at 300, 400 and 500 yards.
rifle at an estimated 3,060 fps, it impacted with about 2,675 fps of remaining velocity
and some 2,050 ft.-lbs.
Likewise, the remaining velocity
of the bullet should be great enough at 400 yards to adequately penetrate and expand.