Retained Energy

[Rez 4,961]

As some know, my PCP's have fluctuated some what recently, so I had a gander at the numbers on ChairGun.

 

My HM on cold days is doing 10.34ft/lbs down from 11.4, but the pellet in .20 at 40 yards is still offering 9.5ft/lbs to the target. Which surprised me, I suppose I dont do enough 'tech' research to be honest. So I worked with the other rifles. The 177 drops surprisingly more at 40 yards... from 10.8ft/lbs to 6.76ft/lbs. And the .22 97 even though its up'd to 11.8 for the purposes of this experiment is dropping more again to 8.7ft/lbs. I rebuilt it with a washer.

 

I would of thought that the .22 would of retained more energy due to its extra mass.

 

Ballistics Table: HM .20

Power down by 7% @ 40 yards

Range POI POI POI POI Drift Drift Drift Drift Cd Time Vel. Vel. Vel. Vel.Res Energy Energy Mom. Mom. Drop Pen. Arc. Angle V.acc

(Yard) (In) (MoA) (mRad) (clk) (In) (MoA) (mRad) (clk) (prj) (sec) (Ft/s) (Mach) (%) (%) (FtLbf) (%) (Grn.s) (%) (In) (In) (Yard) (MoA) (g)

0 -2.50 inf inf inf -0.00 -0.00 -0.00 -0 0.1044 0.000 591.8 0.53 100.0 100.000 10.34 100.00 244.6 100.0 0.0 4.66 0.00 22.480 1.022

5 -1.45 -27.64 -8.02 111 -0.00 -0.07 -0.02 -0 0.1044 0.025 588.9 0.53 99.5 99.901 10.24 99.01 243.4 99.5 -0.1 4.64 5.00 18.199 1.017

10 -0.65 -6.16 -1.79 25 -0.02 -0.17 -0.05 -1 0.1044 0.051 586.0 0.52 99.0 99.901 10.14 98.03 242.2 99.0 -0.5 4.61 10.00 13.388 1.012

15 -0.10 -0.61 -0.18 2 -0.03 -0.21 -0.06 -1 0.1044 0.077 583.1 0.52 98.5 99.901 10.04 97.07 241.0 98.5 -1.1 4.59 15.00 8.548 1.008

20 0.20 0.94 0.27 -4 -0.04 -0.18 -0.05 -1 0.1044 0.102 580.2 0.52 98.0 99.901 9.94 96.11 239.8 98.0 -2.0 4.57 20.00 3.671 1.003

25 0.23 0.89 0.26 -4 -0.03 -0.12 -0.03 -0 0.1044 0.128 577.3 0.52 97.5 99.901 9.84 95.16 238.6 97.5 -3.2 4.55 25.00 -1.290 0.998

30 0.01 0.02 0.01 -0 -0.01 -0.04 -0.01 -0 0.1044 0.154 574.4 0.51 97.1 99.901 9.74 94.22 237.4 97.1 -4.6 4.52 30.00 -6.308 0.993

35 -0.48 -1.31 -0.38 5 0.02 0.05 0.01 0 0.1044 0.181 571.6 0.51 96.6 99.901 9.65 93.29 236.3 96.6 -6.2 4.50 35.00 -11.382 0.989

40 -1.24 -2.95 -0.86 12 0.06 0.14 0.04 1 0.1044 0.207 568.8 0.51 96.1 99.901 9.55 92.37 235.1 96.1 -8.2 4.48 40.00 -16.441 0.984

45 -2.26 -4. -1.39 19 0.11 0.24 0.07 1 0.1044 0.233 566.0 0.51 95.6 99.901 9.46 91.46 233.9 95.6 -10.4 4.46 45.00 -21.619 0.980

50 -3.55 -6.79 -1.97 27 0.18 0.34 0.10 1 0.1044 0.260 563.2 0.50 95.2 99.901 9.36 90.56 232.8 95.2 -12.8 4.44 50.00 -26.855 0.975

Ballistics Table: 100 .177

Power down by 37% @ 40 yards

Range POI POI POI POI POI Drift Drift Drift Drift Drift Cd Time Vel. Vel. Vel. Vel.Res Energy Energy Mom. Mom. Drop Pen. Arc. Angle V.acc

(Yard) (In) (MoA) (mRad) (dot) (clk) (In) (MoA) (mRad) (dot) (clk) (prj) (sec) (Ft/s) (Mach) (%) (%) (FtLbf) (%) (Grn.s) (%) (In) (In) (Yard) (MoA) (g)

0 -2.00 inf inf inf inf -0.00 -0.00 -0.00 -0.00 -0 0.3823 0.000 759.2 0.68 100.0 100.000 10. 100.00 199.1 100.0 0.0 3.50 0.00 16.567 1.125

5 -1.21 -23.10 -6.71 -3.35 92 -0.02 -0.33 -0.10 -0.05 -1 0.3752 0.020 736.2 0.66 97.0 99.391 10.15 94.03 193.1 97.0 -0.1 3.39 5.00 13.903 1.095

10 -0.58 -5.53 -1.61 -0. 22 -0.09 -0.85 -0.25 -0.12 -3 0.3685 0.041 714.3 0.64 94.1 99.401 9.56 88.51 187.3 94.1 -0.3 3.29 10.00 10.761 1.068

15 -0.12 -0.76 -0.22 -0.11 3 -0.17 -1.05 -0.31 -0.15 -4 0.3622 0.062 693.4 0.62 91.3 99.413 9.01 83.41 181.9 91.3 -0.7 3.20 15.00 7.442 1.044

20 0.16 0.76 0.22 0.11 -3 -0.19 -0.89 -0.26 -0.13 -4 0.3561 0.084 673.4 0.60 88.7 99.422 8.50 78.68 176.6 88.7 -1.3 3.10 20.00 3.904 1.021

25 0.25 0.94 0.27 0.14 -4 -0.15 -0.57 -0.16 -0.08 -2 0.3535 0.107 654.3 0.59 86.2 99.426 8.02 74.27 171.6 86.2 -2.1 3.02 25.00 0.126 1.000

30 0.13 0.42 0.12 0.06 -2 -0.05 -0.15 -0.04 -0.02 -1 0.3518 0.130 635.8 0.57 83.7 99.430 7.57 70.14 166.8 83.7 -3.1 2.93 30.00 -3.790 0.980

35 -0.20 -0.54 -0.16 -0.08 2 0.12 0.32 0.09 0.05 1 0.3501 0.154 617.9 0.55 81.4 99.431 7.15 66.25 162.1 81.4 -4.3 2.85 35.00 -8.057 0.961

40 -0.76 -1.81 -0.53 -0.26 7 0.35 0.83 0.24 0.12 3 0.3485 0.178 600.6 0.54 79.1 99.435 6.76 62.59 157.5 79.1 -5.7 2.77 40.00 -12.454 0.943

45 -1.56 -3.30 -0.96 -0.48 13 0.65 1.38 0.40 0.20 6 0.3469 0.204 583.9 0.52 76.9 99.438 6.39 59.15 153.2 76.9 -7.4 2.69 45.00 -17.141 0.926

50 -2.61 -4.98 -1.45 -0.72 20 1.03 1.96 0.57 0.29 8 0.3454 0.230 567.7 0.51 74.8 99.440 6.04 55.92 148.9 74.8 -9.3 2.62 50.00 -22.143 0.911

Ballistics Table: 97 .22

Power down by 26% @ 40 yards

Range POI POI POI POI POI Drift Drift Drift Drift Drift Cd Time Vel. Vel. Vel. Vel.Res Energy Energy Mom. Mom. Drop Pen. Arc. Angle V.acc

(Yard) (In) (MoA) (mRad) (dot) (clk) (In) (MoA) (mRad) (dot) (clk) (prj) (sec) (Ft/s) (Mach) (%) (%) (FtLbf) (%) (Grn.s) (%) (In) (In) (Yard) (MoA) (g)

0 -2.00 inf inf inf inf -0.00 -0.00 -0.00 -0.00 -0 0.2878 0.000 576.4 0.52 100.0 100.000 11. 100.00 286.6 100.0 0.0 3.26 0.00 22.412 1.074

5 -0.96 -18.32 -5.32 -3.72 73 -0.01 -0.27 -0.08 -0.05 -1 0.2870 0.026 565.5 0.51 98.1 99.620 11.36 96.26 281.2 98.1 -0.1 3.20 5.00 17.833 1.055

10 -0.19 -1.81 -0.53 -0.37 7 -0.07 -0.69 -0.20 -0.14 -3 0.2866 0.053 554.9 0.50 96.3 99.621 10.94 92.68 275.9 96.3 -0.5 3.14 10.00 12.562 1.038

15 0.30 1.89 0.55 0.39 -8 -0.13 -0.85 -0.25 -0.17 -3 0.2873 0.080 544.5 0.49 94.5 99.620 10.53 89.22 270.7 94.5 -1.2 3.08 15.00 7.097 1.020

20 0.49 2.35 0.68 0.48 -9 -0.15 -0.72 -0.21 -0.15 -3 0.2880 0.108 534.2 0.48 92.7 99.620 10.13 85.89 265.6 92.7 -2.2 3.02 20.00 1.435 1.003

25 0.38 1.46 0.42 0.30 -6 -0.12 -0.45 -0.13 -0.09 -2 0.2886 0.137 524.1 0.47 90.9 99.619 9.76 82.67 260.6 90.9 -3.5 2.96 25.00 -4.474 0.987

30 -0.05 -0.15 -0.04 -0.03 1 -0.03 -0.11 -0.03 -0.02 -0 0.2893 0.165 514.2 0.46 89.2 99.618 9.39 79.57 255.7 89.2 -5.1 2.91 30.00 -10.604 0.971

35 -0. -2.19 -0.64 -0.45 9 0.10 0.28 0.08 0.06 1 0.2899 0.195 504.4 0.45 87.5 99.617 9.04 76.58 250.8 87.5 -7.0 2.85 35.00 -17.022 0.956

40 -1.90 -4.53 -1.32 -0.92 18 0.30 0.70 0.21 0.14 3 0.2906 0.225 494.8 0.44 85.8 99.617 8.70 73.69 246.0 85.8 -9.3 2. 40.00 -23.609 0.941

45 -3.35 -7.11 -2.07 -1.45 28 0.55 1.16 0.34 0.24 5 0.2912 0.256 485.4 0.43 84.2 99.616 8.37 70.91 241.4 84.2 -11.9 2.75 45.00 -30.512 0.927

50 -5.17 -9.88 -2.87 -2.01 40 0.85 1.63 0.47 0.33 7 0.2918 0.287 476.1 0.43 82.6 99.615 8.05 68.23 236.7 82.6 -14.9 2.69 50.00 -37.663 0.914

 

[Rez 4,961]

And no I dont mean to start ANOTHER calibre war, more pointing that I cant believe how much poke the .20 'low powered' pellet delivers.

[jonnie bravo 572]

Nice one Rez. I wonder if it would change much if they were all on the same power to start with?

 

What is the bc of the 3 pellets in question

[Rez 4,961]

Yeah man, thought that but then the 97 is kicking out substantially more and drops well low. I should of noted the pellets.

 

BC of the pellets is:

 

100: 8.40grn AA Fields 4.52 @ 0.0210

97: 16.00grn AA Fields 5.52 @ 0.0310

 

And interestingly...

 

HM: 13.3grn JSB Exacts 5.10 @ 0.1280

[villaman 9,983]

The test needs to be done with PCP and not a mixture of spring and pcp

[jonnie bravo 572]

Rez, the bc of the .20 seems extremely high which will explain the result's you are getting I reckon, are you sure it's correct?

[jonnie bravo 572]

P.s. Just found a value of .030 for the .20 exact here:

 

http://www.photosbykev.com/wordpress/userfiles/pelletdata.htm

[Rez 4,961]

Rez, the bc of the .20 seems extremely high which will explain the result's you are getting I reckon, are you sure it's correct?

Yeah mate. Thats it, Ive loaded up an old setting. Its all fine now. Sorted 7.46 @ 40 now.

 

Ive thinking about this most the afternoon.

[villaman 9,983]

 

Rez, the bc of the .20 seems extremely high which will explain the result's you are getting I reckon, are you sure it's correct?

Yeah mate. Thats it, Ive loaded up an old setting. Its all fine now. Sorted 7.46 @ 40 now.

 

Ive thinking about this most the afternoon.

 

So the .20 is not as good as you though now

[Rez 4,961]

 

 

Rez, the bc of the .20 seems extremely high which will explain the result's you are getting I reckon, are you sure it's correct?

Yeah mate. Thats it, Ive loaded up an old setting. Its all fine now. Sorted 7.46 @ 40 now.

 

Ive thinking about this most the afternoon.

 

So the .20 is not as good as you though now

 

It was never the point v'man, I was just surprised at the power at the longer distances. Its a good calibre for those who like it.

[jonnie bravo 572]

Sound, easily done bud.

 

After all that it's still not a bad retention considering, it provides a solid middle ground between the two more popular cals.

[charlie caller 3,654]

And considering it takes about 2flbs to kill a rabbit with a head shot, they all have enough energy way past 40 yards, good to know.