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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.270wcf vs 6.8 Western & 270 WSM
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<blockquote data-quote="Western4444" data-source="post: 2172610" data-attributes="member: 118447"><p>I am new to this forum and this is my first post. I have been following the discussions on rebarreling of a 270 WSM with faster twist and COL discussion. I just rebarreled my 270 WSM with 7½ twist and provide the following loading information. I was going to rebarrel in a 6.8 Western, but die sets are not available until next year and wanted it for a deer hunt this year. I did purchase both the 270 WSM Reamer and the 6.8 Western Reamer, so I could go either way. Fortunately I found the three long rang high twist bullets being promoted for use in the 6.8 Western. </p><p></p><p>Using H4831SC powder, I safely loaded the following three long range bullets up to 3000 fps. At that velocity none of the brass showed any signs of stress. There is still room for additional powder in all three if necessary. [My observation - There is no need to seat bullet longer than magazine length. In my case for the Winchester 70 COL 2.965"].</p><p></p><p>Load test were three (3) shot groups at 200 yards, were about ½ MOA. I did pull one shot, that group had 1½ MOA. If I ignore that shot group the other two rounds were ½ MOA. These are not fine-tuned loadings, but rather going up ½ gr looking for brass overpressure issues to safely reach 3000 fps for each bullet. I reached the maximum velocities I have seen for the "6.8 Western" cartridge data or on any of the ammo boxes or provided elsewhere.</p><p></p><p>All were loaded about 15/1000 off the lande or 2.965 [magazine fit]. I used Hodgdon web tool for determining Starting and Maximum Loads and Berger provided loading information on the Elite Hunter bullet.</p><p></p><p>175 Sierra Tipped Game King – 2.965 COL Average Velocity 3000 fps</p><p></p><p>170 Berger Elite Hunter – 2.965 COL Average Velocity 3075 fps</p><p></p><p>165 Nosler AccuBond Long Range – 2.900 COL Average Velocity 3175 fps</p><p></p><p>I am feeling very good about this rifle rebuild with a 7½ twist and know I can obtain the same results as the "6.8 Western". And can do better because I reload and can finetune the powder load and seating depth. My initial concern was powder capacity in the 270 as the bullet could not be seated out as far as the 6.8, but not an issue with a Winchester or Savage. I am amazed by the powder capacity in the 270 WSM cartridge, more than a 45-70. I don't think a reloader would purchase a 6.8 Western, no advantage over rebarreled 270 WSM. Available brass and bullets, and can shoot factory ammo with a 270 WSM.</p><p></p><p>The only question [on possible advantage] is "efficiency" … Is the 6.8 Western more efficient than the 270 WSM with a 7½ twist barrel. Question for a reloader … Does the 6.8 Western need less or more powder to achieve the same velocities as a rebarreled 270 WSM? My next step will be to fine tune loadings for each bullet using H4831SC. </p><p></p><p>I look forward to hearing results from others. As we know every gun is different, but I think they will find similar results with no need to increase free bore to get comparable results as the 6.8 Western.</p></blockquote><p></p>
[QUOTE="Western4444, post: 2172610, member: 118447"] I am new to this forum and this is my first post. I have been following the discussions on rebarreling of a 270 WSM with faster twist and COL discussion. I just rebarreled my 270 WSM with 7½ twist and provide the following loading information. I was going to rebarrel in a 6.8 Western, but die sets are not available until next year and wanted it for a deer hunt this year. I did purchase both the 270 WSM Reamer and the 6.8 Western Reamer, so I could go either way. Fortunately I found the three long rang high twist bullets being promoted for use in the 6.8 Western. Using H4831SC powder, I safely loaded the following three long range bullets up to 3000 fps. At that velocity none of the brass showed any signs of stress. There is still room for additional powder in all three if necessary. [My observation - There is no need to seat bullet longer than magazine length. In my case for the Winchester 70 COL 2.965”]. Load test were three (3) shot groups at 200 yards, were about ½ MOA. I did pull one shot, that group had 1½ MOA. If I ignore that shot group the other two rounds were ½ MOA. These are not fine-tuned loadings, but rather going up ½ gr looking for brass overpressure issues to safely reach 3000 fps for each bullet. I reached the maximum velocities I have seen for the “6.8 Western” cartridge data or on any of the ammo boxes or provided elsewhere. All were loaded about 15/1000 off the lande or 2.965 [magazine fit]. I used Hodgdon web tool for determining Starting and Maximum Loads and Berger provided loading information on the Elite Hunter bullet. 175 Sierra Tipped Game King – 2.965 COL Average Velocity 3000 fps 170 Berger Elite Hunter – 2.965 COL Average Velocity 3075 fps 165 Nosler AccuBond Long Range – 2.900 COL Average Velocity 3175 fps I am feeling very good about this rifle rebuild with a 7½ twist and know I can obtain the same results as the “6.8 Western”. And can do better because I reload and can finetune the powder load and seating depth. My initial concern was powder capacity in the 270 as the bullet could not be seated out as far as the 6.8, but not an issue with a Winchester or Savage. I am amazed by the powder capacity in the 270 WSM cartridge, more than a 45-70. I don’t think a reloader would purchase a 6.8 Western, no advantage over rebarreled 270 WSM. Available brass and bullets, and can shoot factory ammo with a 270 WSM. The only question [on possible advantage] is “efficiency” … Is the 6.8 Western more efficient than the 270 WSM with a 7½ twist barrel. Question for a reloader … Does the 6.8 Western need less or more powder to achieve the same velocities as a rebarreled 270 WSM? My next step will be to fine tune loadings for each bullet using H4831SC. I look forward to hearing results from others. As we know every gun is different, but I think they will find similar results with no need to increase free bore to get comparable results as the 6.8 Western. [/QUOTE]
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.270wcf vs 6.8 Western & 270 WSM
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