jnormanh
New member
I ran across a piece of 1/4" plywood I had used to hold a piece of paper for patterning.
It was shot with a 20 ga Remington 7/8 oz #6 shot 1225 fps. 30 yards through an IC choke.
7/8 oz of #6 should be 196 pellets. I count 157 pellet strikes on the plywood, but it's only 24" across the narrow dimension, so 39 pellets could have well missed the plywood.
What is interesting is this - 57 pellets punched clean though all three plys. Of the other 100, some stopped in the first ply, and some in the second and third plys.
Since the plywood must be fairly uniform in hardness, this tells me that some pellets carry considerable more energy than others.
Someone here mentioned Brister's book. I remember that Brister measured the length of shot strings, and at 40 yards found the string to be something like 12' long, meaning a difference if about 10% in shot velocity.
Since energy = m x v(squared), a 10% difference on velocity would = 21% difference in energy. Enough, perhaps, to account for what I observed with penetration of plywood. And a noticeable difference in penetration in game.
What all this means, I dunno'.
It was shot with a 20 ga Remington 7/8 oz #6 shot 1225 fps. 30 yards through an IC choke.
7/8 oz of #6 should be 196 pellets. I count 157 pellet strikes on the plywood, but it's only 24" across the narrow dimension, so 39 pellets could have well missed the plywood.
What is interesting is this - 57 pellets punched clean though all three plys. Of the other 100, some stopped in the first ply, and some in the second and third plys.
Since the plywood must be fairly uniform in hardness, this tells me that some pellets carry considerable more energy than others.
Someone here mentioned Brister's book. I remember that Brister measured the length of shot strings, and at 40 yards found the string to be something like 12' long, meaning a difference if about 10% in shot velocity.
Since energy = m x v(squared), a 10% difference on velocity would = 21% difference in energy. Enough, perhaps, to account for what I observed with penetration of plywood. And a noticeable difference in penetration in game.
What all this means, I dunno'.