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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: 2183465" data-attributes="member: 118447"><p><strong>Loading Update - 270 WSM with 7½ twist</strong></p><p></p><p>This was also placed on the longrangeonly.com forum.</p><p></p><p>Continued fine tuning loads with H4831SC powder, safely working with velocities around 3000 fps. At that velocity none of the brass showed any signs of stress, and there is still room for additional powder in all cartridges if necessary. Easily reached the 3000 fps, maximum velocities seen for the "6.8 Western" (cartridge data or on any of the ammo boxes).</p><p></p><p>Load test were three (3) shot groups at 200 yards. My best group was with the 165 Nosler AccuBond Long Range bullet. I did add a fourth bullet using H4831SC, the 150 Hornady InterBond bullet.<strong> Results follow:</strong></p><p><strong></strong></p><p><strong>175 Sierra Tipped Game King</strong> – 2.965 COL Average Velocity 2910 fps. The vertical spread was great, less than 1". The horizontal spread was 2½", a little over 1 MOA. In tweaking seating depth and powder charge, I should be able to obtain a 1" group. With this 1 MOA Group, I feel comfortable hunting with this load, at least for deer. My maximum distance where I hunt is 400 yards, so this will be a fine load. But will continue tweaking seating depth and charge weight to get smaller group.</p><p></p><p><strong>170 Berger Elite Hunter</strong> – 2.965 COL Average Velocity 2950 fps. The vertical spread was fantastic, less than 3/4". The horizontal spread was 2" (1 MOA). Again, in tweaking seating depth and powder charge, I should be able to obtain under a 1" group. I feel comfortable hunting with this load. Very good load but will continue tweaking seating depth and charge weight to get a smaller group.</p><p></p><p><strong>165 Nosler AccuBond Long Range</strong> – 2.900 COL Average Velocity 3060 fps. Excellent group at 200 yards, less than ¾" group (0.375 MOA). This is my deer hunting bullet for this year. It preformed consistently in all testing. My next phase for this bullet, is test at 350 to 600 yards. Since my longest shot is 400 yards, I will focus on 350 and 400 yards. I already know how it shoots at 200 yards, yardage my rifle is sighted in at. Since I have a limited powder supply of H4831SC, I will only be focusing on long range testing of this Nosler bullet. Others bullets will need to wait until more powder becomes available.</p><p></p><p><strong>150 Hornady InterBond</strong> - 2.880 COL Average Velocity 3125 fps. I need to rethink this loading. I had a 3½" group (1.75 MOA). I started with H414 powder and had the same results. Have any of you handloaded this round in a 270 WSM?</p><p></p><p>I also test two Sierra bullets (140 GK and 150 GK) using H414 Powder. Since my longest deer shot is 400 yards, most likely a 100 yard shot, these are two good back-up deer rounds. Both had great groups. <strong>Results follow:</strong></p><p><strong></strong></p><p><strong>150 Sierra Game King</strong> – 2.780 COL Average Velocity 3060 fps. Excellent group at 200 yards, 1½" group (0.750 MOA"). An excellent deer round. At 200 yards the group was about 3" higher on paper than the 165 Nosler Group. I will continue testing at 350 and 400 yards.</p><p></p><p><strong>140 Sierra Game King HPBT</strong> – 2.740 COL Average Velocity 3060 fps. Essentially the same group as the 150 Game King, 1½" group at 200 yards. The Sierra GK HPBT is one of my favorite bullets. Excellent accuracy and efficiency.</p><p></p><p><strong>In summary:</strong> I getting great results from my Winchester 70 - 270 WSM with a 7½ twist. I know I can obtain the same results or better as the 6.8 Western. Bullet seating depth is not an issue, no need to increase Free Bore. Current SAAMI specifications are fine for these high twist bullets in a 270 WSM (as long as your magazine can handle a little longer bullet – 2.965" in my Winchester 70 magazine). The Winchester 70s and Savages should not be a problem in rebarreling as their magazine can accommodate a little long bullet. The only question is potential efficiency … Is the 6.8 Western more efficient than the 270 WSM with a 7½ twist barrel? What I appreciate, the availability of factory ammo and brass availability for reloading. The only downside I see is 130 gr or less weight bullets do not shoot well in the higher twist barrel. Much better suited for 140 gr or higher weight bullets.</p></blockquote><p></p>
[QUOTE="Western4444, post: 2183465, member: 118447"] [B]Loading Update - 270 WSM with 7½ twist[/B] This was also placed on the longrangeonly.com forum. Continued fine tuning loads with H4831SC powder, safely working with velocities around 3000 fps. At that velocity none of the brass showed any signs of stress, and there is still room for additional powder in all cartridges if necessary. Easily reached the 3000 fps, maximum velocities seen for the “6.8 Western” (cartridge data or on any of the ammo boxes). Load test were three (3) shot groups at 200 yards. My best group was with the 165 Nosler AccuBond Long Range bullet. I did add a fourth bullet using H4831SC, the 150 Hornady InterBond bullet.[B] Results follow: 175 Sierra Tipped Game King[/B] – 2.965 COL Average Velocity 2910 fps. The vertical spread was great, less than 1”. The horizontal spread was 2½”, a little over 1 MOA. In tweaking seating depth and powder charge, I should be able to obtain a 1” group. With this 1 MOA Group, I feel comfortable hunting with this load, at least for deer. My maximum distance where I hunt is 400 yards, so this will be a fine load. But will continue tweaking seating depth and charge weight to get smaller group. [B]170 Berger Elite Hunter[/B] – 2.965 COL Average Velocity 2950 fps. The vertical spread was fantastic, less than 3/4”. The horizontal spread was 2” (1 MOA). Again, in tweaking seating depth and powder charge, I should be able to obtain under a 1” group. I feel comfortable hunting with this load. Very good load but will continue tweaking seating depth and charge weight to get a smaller group. [B]165 Nosler AccuBond Long Range[/B] – 2.900 COL Average Velocity 3060 fps. Excellent group at 200 yards, less than ¾” group (0.375 MOA). This is my deer hunting bullet for this year. It preformed consistently in all testing. My next phase for this bullet, is test at 350 to 600 yards. Since my longest shot is 400 yards, I will focus on 350 and 400 yards. I already know how it shoots at 200 yards, yardage my rifle is sighted in at. Since I have a limited powder supply of H4831SC, I will only be focusing on long range testing of this Nosler bullet. Others bullets will need to wait until more powder becomes available. [B]150 Hornady InterBond[/B] - 2.880 COL Average Velocity 3125 fps. I need to rethink this loading. I had a 3½” group (1.75 MOA). I started with H414 powder and had the same results. Have any of you handloaded this round in a 270 WSM? I also test two Sierra bullets (140 GK and 150 GK) using H414 Powder. Since my longest deer shot is 400 yards, most likely a 100 yard shot, these are two good back-up deer rounds. Both had great groups. [B]Results follow: 150 Sierra Game King[/B] – 2.780 COL Average Velocity 3060 fps. Excellent group at 200 yards, 1½” group (0.750 MOA”). An excellent deer round. At 200 yards the group was about 3” higher on paper than the 165 Nosler Group. I will continue testing at 350 and 400 yards. [B]140 Sierra Game King HPBT[/B] – 2.740 COL Average Velocity 3060 fps. Essentially the same group as the 150 Game King, 1½” group at 200 yards. The Sierra GK HPBT is one of my favorite bullets. Excellent accuracy and efficiency. [B]In summary:[/B] I getting great results from my Winchester 70 - 270 WSM with a 7½ twist. I know I can obtain the same results or better as the 6.8 Western. Bullet seating depth is not an issue, no need to increase Free Bore. Current SAAMI specifications are fine for these high twist bullets in a 270 WSM (as long as your magazine can handle a little longer bullet – 2.965” in my Winchester 70 magazine). The Winchester 70s and Savages should not be a problem in rebarreling as their magazine can accommodate a little long bullet. The only question is potential efficiency … Is the 6.8 Western more efficient than the 270 WSM with a 7½ twist barrel? What I appreciate, the availability of factory ammo and brass availability for reloading. The only downside I see is 130 gr or less weight bullets do not shoot well in the higher twist barrel. Much better suited for 140 gr or higher weight bullets. [/QUOTE]
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