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Recoil Spring

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I shoot 230 Military Ball through my Colt Md 1911 Series 70. What recoil spring, should I use? Weight and maker.
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For the new IPSC Powerfactor of 165 I use a 17lb. recoil spring for my 200gr.SWC If I shot 230gr. I would use the 18lb.-18.5lb. recoil spring. You really kill shock-buffs with a 16lb. recoil spring no matter what type of bullet you use.
 
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