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Rifles, Reloading, Optics, Equipment
Reloading
CFE223 in cold weather??
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<blockquote data-quote="ChrisTeam2" data-source="post: 2721956" data-attributes="member: 123937"><p>In case this might be helpful: </p><p></p><p>I just tested a proven load with CFE-223 69 Gr. TMKs (Mostly used in 8-45 Celsius Temps) from my 3 years old AR-15 which has a 16" barrel and then tested this load in a new 20" AR-15 that is still breaking in. Bottom line is that the SD was 17.5 fps (not that great, getting about 12 fps in my other rifle), velocity was a respectable 2937 fps at 20 Celsius, 5 shot groups were horrible at 3.5+ MOAs. </p><p></p><p>I thought about switching primers (from Federal match to CCI No. 41 or Magnum No. 450) but given the data I have, the CFE-223 temp. variability is 1.7 fps per degree Fahrenheit. To economize my time, I think I am going to try and use TAC (0.91 fps per degree Fahrenheit based on third party data) which has given me very good results with 60 gr. TMKs in that same AR 20" AR-15 with 10.0 fps SD. I will therefore develop a TAC load with 69 TMKs, hoping it shoots well in both rifles; happy to share my data once the results are in, if it is of interest. </p><p></p><p>Idgunner: if you have a lot CFE-223 it may be worthwhile for you to try a magnum primer and redo your load development for a winter load? On a recent Erik Cortina podcast Believe the Target: </p><p></p><p></p><p>[MEDIA=youtube]Z0RC17Dbtws:1025[/MEDIA]</p><p></p><p></p><p></p><p>Bryan Litz commented that low SDs and accuracy largely stems, in his experience from the proper powder and primer combination and he added that usually once you have that right powder to primer combination, you usually have 1-4 grains of freedom from which to develop your load. Could be worth a trial to use different load/primers combination...</p></blockquote><p></p>
[QUOTE="ChrisTeam2, post: 2721956, member: 123937"] In case this might be helpful: I just tested a proven load with CFE-223 69 Gr. TMKs (Mostly used in 8-45 Celsius Temps) from my 3 years old AR-15 which has a 16" barrel and then tested this load in a new 20" AR-15 that is still breaking in. Bottom line is that the SD was 17.5 fps (not that great, getting about 12 fps in my other rifle), velocity was a respectable 2937 fps at 20 Celsius, 5 shot groups were horrible at 3.5+ MOAs. I thought about switching primers (from Federal match to CCI No. 41 or Magnum No. 450) but given the data I have, the CFE-223 temp. variability is 1.7 fps per degree Fahrenheit. To economize my time, I think I am going to try and use TAC (0.91 fps per degree Fahrenheit based on third party data) which has given me very good results with 60 gr. TMKs in that same AR 20" AR-15 with 10.0 fps SD. I will therefore develop a TAC load with 69 TMKs, hoping it shoots well in both rifles; happy to share my data once the results are in, if it is of interest. Idgunner: if you have a lot CFE-223 it may be worthwhile for you to try a magnum primer and redo your load development for a winter load? On a recent Erik Cortina podcast Believe the Target: [MEDIA=youtube]Z0RC17Dbtws:1025[/MEDIA] Bryan Litz commented that low SDs and accuracy largely stems, in his experience from the proper powder and primer combination and he added that usually once you have that right powder to primer combination, you usually have 1-4 grains of freedom from which to develop your load. Could be worth a trial to use different load/primers combination... [/QUOTE]
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CFE223 in cold weather??
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