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I have chrono'd quite a few different rounds from mine. Here are some numbers that I've got handy for various ammos from the 21A's 2 3/8" pop-up barrel (5950'>sea level):
Winchester Super X Super Speed RN 40-gr plated round nose
M 811.3/ES 46.8/SD 20.89
CCI SGB (Small Game Bullet) 40-gr LFP
M 841.2/ES 67.1/SD 22.79
CCI Blazer 40-gr RNL
M 830.1/ES 143.7/SD 51.41
PMC Zapper 40-gr PRNL (red box)
M 797.5/ES 101.2/SD 52.84
PMC Zapper 40-gr PRNL (orange box)
M 847.7/ES 98.76/SD 38.74
CCI Velocitor (new) 40-gr PHP
M 852.2/ES 71.41/SD 28.14
Aguila SSS 60-gr RNL
M 606.0/ES 47.34/SD 21.07
Aguila Super Colibri 20-gr lead truncated cone
M 494.4/ES 19.74/SD 8.18
CCI Stinger 32-gr PHP
M 1004/ES 86.16/SD 38.45
Aguila Interceptor 40-gr PFP
M 931.8/ES 155.2/SD 55.79
CCI Mini-Mag 40-gr PRN
M 879.9/ES 16.60/SD 7.07
Federal Champion bulk 36-gr PHP
M 928.1/ES 105.9/SD 38.96
CCI Mini-Mag 36-gr PHP
M 848.1/ES 71.00/SD 27.87
Aguila .22 Super Extra 40-gr PRN
M 836.1/ES 68.87/SD 29.42
Federal AutoMatch bulk 40-gr RNL
M 849.3 fps/ES 29.58 fps/SD 11.40
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