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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
RANGE RESULTS, speed or accuracy if you have to choose?
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<blockquote data-quote="Derek M." data-source="post: 715656" data-attributes="member: 2693"><p>I was able to chronograph my loads today with a Chrony Alpha. Don't know if it is good quality or not but it reads velocities. Odd things happened today.</p><p></p><p>Checking my new 270 with Krieger barrel with New Win brass, Federal 210M primers, 150 Berger VLD seated to COAL 3.260 and H4831SC. I'll have to double check how far from lands.</p><p></p><p>56.0 grains x 3: 2892, 2905, 2909. One inch group at 100 yards</p><p>56.5 grains x 3: 2871, 2920, 2913. 3/4" group</p><p>57.0 grains x 3: 3012, 3005, 3007. 5/8" group (I totally dig this group and will work with it).</p><p>57.5 grains x 3: 3026, 2998, 2982. 3/4" group [why would I get 2 slower than 3000 with more powder)?</p><p></p><p>All charges weighed one at a time. All brass sorted to w/i 0.5 grains.</p><p></p><p>My 280 with Shilen pipe, 150 btips, 57.5gr VV N165, Norma cases, Fed 210M primers. This load prints very well in the 1/4 minute and very consistent but velocity is lacking. Shouldn't matter with a Btip. I've had tremendous success with this bullet when slowed down. The first 5 were what I had left over with a deeper seat. Then I shot a few more with the correct depth for best accuracy:</p><p></p><p>1. 2683</p><p>2. 2715</p><p>3. 2699</p><p>4. 2703</p><p>5. 2686</p><p></p><p>Seated closer to lands and a cold barrel start again:</p><p></p><p>1. 2741</p><p>2. 2763</p><p>3. 2760</p><p>4. 2755</p><p>5. 2761</p><p></p><p>The 270 is pushing the 150 Berger VLD at 3000 fps but I will have to play with seating to match the accuracy of the 280 which is pushing a 150 Btip in the mid 2700s. Of course I've ONLY tried the one powder in the 280. It just did so well I stopped playing for this season. </p><p></p><p>The 270 and 280 both have 24" barrels.</p><p></p><p>7mag/Krieger, 168 Berger VLD, Win brass, 215M primer, 0.010 jump:</p><p></p><p>1. 3036</p><p>2. 3055</p><p>3. 3060</p><p>4. error</p><p>5. 3020</p><p></p><p>The 6.5-284 with 24" Bartlein had some disappointing speed but I have a lot of work to do with it as well. 140 Berger VLD, new Lapua brass, 210M, Retumbo, 0.010 jump:</p><p></p><p>1. 57.5 grains, 2878, 2840, 2862 (sticky bolt lift)</p><p>2. 57.0 grains, 2814, 2756, 2807, 2813.</p><p></p><p>The last time I was testing Retumbo, I got a 1/4 minute group at 100 with 56.0 grains and reverified it today and it was still 1/4 minute but I didn't get to chrony those loads dang it. </p><p></p><p>So, for the 270, how do you add only a half a grain and go basically from 2900 and some change to 3000 fps? I'm not complaining and I can live with a better than half inch group. I'll have to retest it at 200 yards and alter seat depth to see if I can enhance accuracy of course.</p><p></p><p>I loaded everything in one sitting and weigh each charge, sort brass, etc. Scale calibrated yada yada yada...</p><p></p><p>Thoughts?</p></blockquote><p></p>
[QUOTE="Derek M., post: 715656, member: 2693"] I was able to chronograph my loads today with a Chrony Alpha. Don't know if it is good quality or not but it reads velocities. Odd things happened today. Checking my new 270 with Krieger barrel with New Win brass, Federal 210M primers, 150 Berger VLD seated to COAL 3.260 and H4831SC. I'll have to double check how far from lands. 56.0 grains x 3: 2892, 2905, 2909. One inch group at 100 yards 56.5 grains x 3: 2871, 2920, 2913. 3/4" group 57.0 grains x 3: 3012, 3005, 3007. 5/8" group (I totally dig this group and will work with it). 57.5 grains x 3: 3026, 2998, 2982. 3/4" group [why would I get 2 slower than 3000 with more powder)? All charges weighed one at a time. All brass sorted to w/i 0.5 grains. My 280 with Shilen pipe, 150 btips, 57.5gr VV N165, Norma cases, Fed 210M primers. This load prints very well in the 1/4 minute and very consistent but velocity is lacking. Shouldn't matter with a Btip. I've had tremendous success with this bullet when slowed down. The first 5 were what I had left over with a deeper seat. Then I shot a few more with the correct depth for best accuracy: 1. 2683 2. 2715 3. 2699 4. 2703 5. 2686 Seated closer to lands and a cold barrel start again: 1. 2741 2. 2763 3. 2760 4. 2755 5. 2761 The 270 is pushing the 150 Berger VLD at 3000 fps but I will have to play with seating to match the accuracy of the 280 which is pushing a 150 Btip in the mid 2700s. Of course I've ONLY tried the one powder in the 280. It just did so well I stopped playing for this season. The 270 and 280 both have 24" barrels. 7mag/Krieger, 168 Berger VLD, Win brass, 215M primer, 0.010 jump: 1. 3036 2. 3055 3. 3060 4. error 5. 3020 The 6.5-284 with 24" Bartlein had some disappointing speed but I have a lot of work to do with it as well. 140 Berger VLD, new Lapua brass, 210M, Retumbo, 0.010 jump: 1. 57.5 grains, 2878, 2840, 2862 (sticky bolt lift) 2. 57.0 grains, 2814, 2756, 2807, 2813. The last time I was testing Retumbo, I got a 1/4 minute group at 100 with 56.0 grains and reverified it today and it was still 1/4 minute but I didn't get to chrony those loads dang it. So, for the 270, how do you add only a half a grain and go basically from 2900 and some change to 3000 fps? I'm not complaining and I can live with a better than half inch group. I'll have to retest it at 200 yards and alter seat depth to see if I can enhance accuracy of course. I loaded everything in one sitting and weigh each charge, sort brass, etc. Scale calibrated yada yada yada... Thoughts? [/QUOTE]
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