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Varmint Hunting
Should I go 20 practical?
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<blockquote data-quote="Hugnot" data-source="post: 3088113" data-attributes="member: 115658"><p>Another consideration for the .20P is the limited & light recoil, this gets into the shooter spotting hits. Corrections are quickly & easily made without assistance from a spotter.</p><p></p><p>Some recoil or kick energy values:</p><p></p><p>[ATTACH=full]565009[/ATTACH]</p><p></p><p>Comparing the .20P/40 VMax @ 3650 with the .22-.250/53 VMax & 3650</p><p></p><p>recoil energy for the .20P = 3.1 foot pounds</p><p>recoil energy for the .22-.250 = 5.7 foot pounds</p><p></p><p>Same velocity and similar (but not equal) ballistic value bullets, the .204 40 VMax & .224 53 VMax.</p><p></p><p>The gun velocity was calculated by using the momentum equation, P=MV, solving for V = P/V, P being the sum of ((bullet mass * bullet velocity) + (powder mass * powder gas velocity)) / mass of the rifle in grains.</p><p></p><p>Then finally the rifle recoil energy is calculated by E= 1/2 M V^2, M being the (weight of the rifle in pounds / 32.163 * gun velocity squared) / 2</p><p>The 32.136 is the acceleration of gravity in Ft/sec/sec.</p><p></p><p>This is why one shooter replaced his .22-.250 for a .20P.</p><p></p><p>Barrel life is another consideration. My 12 year old .20P still shoots less then 1 MOA.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 3088113, member: 115658"] Another consideration for the .20P is the limited & light recoil, this gets into the shooter spotting hits. Corrections are quickly & easily made without assistance from a spotter. Some recoil or kick energy values: [ATTACH type="full" alt="Screenshot (896).png"]565009[/ATTACH] Comparing the .20P/40 VMax @ 3650 with the .22-.250/53 VMax & 3650 recoil energy for the .20P = 3.1 foot pounds recoil energy for the .22-.250 = 5.7 foot pounds Same velocity and similar (but not equal) ballistic value bullets, the .204 40 VMax & .224 53 VMax. The gun velocity was calculated by using the momentum equation, P=MV, solving for V = P/V, P being the sum of ((bullet mass * bullet velocity) + (powder mass * powder gas velocity)) / mass of the rifle in grains. Then finally the rifle recoil energy is calculated by E= 1/2 M V^2, M being the (weight of the rifle in pounds / 32.163 * gun velocity squared) / 2 The 32.136 is the acceleration of gravity in Ft/sec/sec. This is why one shooter replaced his .22-.250 for a .20P. Barrel life is another consideration. My 12 year old .20P still shoots less then 1 MOA. [/QUOTE]
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Should I go 20 practical?
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