ᗝ BC Test of .25cal Polymag
- By Long_Shot
- Projectiles
- 6 Replies
Good job checking for yourself. 
Outstanding presentation as always.
Large velocity drop for 55 yards. approx. 140 FPS
Your velocity ES at 50 yards is still about the same. That's good.
140 FPS loss shows how much BC does matter for down range velocity.
You said: "➠ If a HP has a low BC, it will loose velocity rapidly and reach its
non-expansion threshold very close to the muzzle — reducing the HP pellet to a short range projectile. "
Not necessarily apples to apples here.
But, a higher BC does make a big difference in velocity at POI
just as you pointed out.
Recently tested a .25 cal. 48 gr. HP slug as a comparison here.
5 shots ea. Shooting any more than 5 gets too redundant.
Average: 887 FPS @ 1 yard - 3 FPS ES
Average: 806 FPS @ 100 yards - 4 FPS ES
Keep testing, and don't shoot the chrony.............
Outstanding presentation as always.
Large velocity drop for 55 yards. approx. 140 FPS
Your velocity ES at 50 yards is still about the same. That's good.
140 FPS loss shows how much BC does matter for down range velocity.
You said: "➠ If a HP has a low BC, it will loose velocity rapidly and reach its
non-expansion threshold very close to the muzzle — reducing the HP pellet to a short range projectile. "
Not necessarily apples to apples here.
But, a higher BC does make a big difference in velocity at POI
just as you pointed out.
Recently tested a .25 cal. 48 gr. HP slug as a comparison here.
5 shots ea. Shooting any more than 5 gets too redundant.
Average: 887 FPS @ 1 yard - 3 FPS ES
Average: 806 FPS @ 100 yards - 4 FPS ES
Keep testing, and don't shoot the chrony.............
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