AEA .30 caliber 66 grain pellets!!!
- Thread starter Centercut
- Start date
I got to trying these 66gr in my Red Panda. I got them up to just under 900fps, about the max it seems for this rifle. BC on my FX chrony showed .06. While playing with the speeds I really saw spiraling at speeds under 850 fps. I think the twist in the Red Panda is boarder line for these pellets.
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I have analysed the pellets from the pictures and measurements given in this thread and roughly tried to model them.
The first thing which came out was that this pellet appears to be aerodynamically unstable, not stable like most pellets. This is due to the very shallow base cavity moving the centre of gravity back, and the very shallow flare producing a very small stabilizing moment about the CG. This means that the pellets behave more like slugs, but with much reduced aerodynamic instability and increased drag coefficient compared to a slug. As a result, the pellet appears to have a very long yaw wavelength compared to other pellets.
Now comes the humble pie. Centercut was probably correct when he said a higher twist rate than the 1 in 40 inch he had would be better. First look shows a smoother trajectory with a 1 in 20 inch twist than the 1 in 40. However, I have not yet analysed the errors at the target with the different twist rates. I need to look at the error sizes with the same inputs. When I said I thought a slower twist rate may be better, I was basically assuming they behaved like pellets, my mistake.
The first thing which came out was that this pellet appears to be aerodynamically unstable, not stable like most pellets. This is due to the very shallow base cavity moving the centre of gravity back, and the very shallow flare producing a very small stabilizing moment about the CG. This means that the pellets behave more like slugs, but with much reduced aerodynamic instability and increased drag coefficient compared to a slug. As a result, the pellet appears to have a very long yaw wavelength compared to other pellets.
Now comes the humble pie. Centercut was probably correct when he said a higher twist rate than the 1 in 40 inch he had would be better. First look shows a smoother trajectory with a 1 in 20 inch twist than the 1 in 40. However, I have not yet analysed the errors at the target with the different twist rates. I need to look at the error sizes with the same inputs. When I said I thought a slower twist rate may be better, I was basically assuming they behaved like pellets, my mistake.
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