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Rifles, Reloading, Optics, Equipment
7mm STW
IMR 7977 Enduron
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<blockquote data-quote="jjmp" data-source="post: 1411787" data-attributes="member: 9664"><p>Laynes powder charge was 78 gns of IMR 7977 for the Swift 160 a-frame bullet,and for the Sierra 175 gn gamekings the charge was 75 gns of same IMR 7977 powder. 3 different temp ranges were used with each of the 2bullets stated above, Swift 160A-F Tested at -15 degrees tmv was 2933 fps sd was72, 100 yd group was1.29. 2 temp same 160 saf was +78 degrees tmv was 3006 fps sd was52,100 yd group was1.34, 3rd temp same 160 saf, was +140 degrees tmv was 3019 fps sd was 25 ,100 yd group was 1.20,( note ) col was 3.600 ,jump to lands was 0.15 thou.case was FC federal, primer was federal 215 mag primer, with 160 SAF bullet. rifle Ruger #1with a 26 inch bbl. test for Sierras 175 gamkings were as follows col was 3.620 =0.40 thou off lands same FCbrass same f215 primer ,-15 degrees tmv was 2783 fps,sd was 67, 1oo yd group was 1.37. 2temp was +78 degrees tmv was 2852 fps, sd was,29, 100 yd group was 1.18. 3rd temp was+140 degrees tmv was 2857 fps,sd was33,100yd group was 1.24. all this info is for the 7mm-STW Only.!!! thks Layne! my above post explains where an when LS wrote the article ,Long live the 7STW!!!</p></blockquote><p></p>
[QUOTE="jjmp, post: 1411787, member: 9664"] Laynes powder charge was 78 gns of IMR 7977 for the Swift 160 a-frame bullet,and for the Sierra 175 gn gamekings the charge was 75 gns of same IMR 7977 powder. 3 different temp ranges were used with each of the 2bullets stated above, Swift 160A-F Tested at -15 degrees tmv was 2933 fps sd was72, 100 yd group was1.29. 2 temp same 160 saf was +78 degrees tmv was 3006 fps sd was52,100 yd group was1.34, 3rd temp same 160 saf, was +140 degrees tmv was 3019 fps sd was 25 ,100 yd group was 1.20,( note ) col was 3.600 ,jump to lands was 0.15 thou.case was FC federal, primer was federal 215 mag primer, with 160 SAF bullet. rifle Ruger #1with a 26 inch bbl. test for Sierras 175 gamkings were as follows col was 3.620 =0.40 thou off lands same FCbrass same f215 primer ,-15 degrees tmv was 2783 fps,sd was 67, 1oo yd group was 1.37. 2temp was +78 degrees tmv was 2852 fps, sd was,29, 100 yd group was 1.18. 3rd temp was+140 degrees tmv was 2857 fps,sd was33,100yd group was 1.24. all this info is for the 7mm-STW Only.!!! thks Layne! my above post explains where an when LS wrote the article ,Long live the 7STW!!! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
IMR 7977 Enduron
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