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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
30" 257 Weatherby - What can I expect.
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<blockquote data-quote="Hired Gun" data-source="post: 1974716" data-attributes="member: 1290"><p>Edited. Son was doing the loading and was under impression he was using 7828. HE WAS NOT!!! It was RL-33. Everything else was the same. </p><p></p><p>Should read. First test completed. 110 Accubonds. 85 grains of RL-33 yields 3775 fps ES for 6 shots was 10 fps. 5 shot group was 3/4 MOA with no rear bag or any support other than a floating shoulder. On 20 power Leupold the crosshairs were visibly moving. We were more interested in speed and pressure at this point. 3 of the 6 shots were exactly 3775 fps on LabRadar. Slowest was 3765 fps. OAL is 3.300". CCI-250 primers. Absolutely no pressure signs and bolt handle opens as though the chamber is empty. Weatherby well used brass with light chamfer on inside is the only prep the brass has ever seen. Chamber is min spec Saami set to .001" under zero head space so had to set die to cam over to make the bolt close perfect. Case is half way up the neck with 85 grains so most likely will need a slightly faster powder to get much more speed. We might be able to vibrate another 3 grains in there and compress it in there. </p><p></p><p>It will be a few weeks before we get out again. Suppressor changes point of impact 4" vertically. Sounds like a giant air rifle. Made the whole range shut down. They all thought it was a squib load. All speed tests were done with the YHM QD muzzle brake attached. Recoil was next to nothing. </p><p></p><p>Now it's going to be time consuming part as we explore the powders to find one that fits yet is still burning to the end of the 30" barrel. I wonder just how flat a 3800+ fps 110 Accubond really will fly.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 1974716, member: 1290"] Edited. Son was doing the loading and was under impression he was using 7828. HE WAS NOT!!! It was RL-33. Everything else was the same. Should read. First test completed. 110 Accubonds. 85 grains of RL-33 yields 3775 fps ES for 6 shots was 10 fps. 5 shot group was 3/4 MOA with no rear bag or any support other than a floating shoulder. On 20 power Leupold the crosshairs were visibly moving. We were more interested in speed and pressure at this point. 3 of the 6 shots were exactly 3775 fps on LabRadar. Slowest was 3765 fps. OAL is 3.300". CCI-250 primers. Absolutely no pressure signs and bolt handle opens as though the chamber is empty. Weatherby well used brass with light chamfer on inside is the only prep the brass has ever seen. Chamber is min spec Saami set to .001" under zero head space so had to set die to cam over to make the bolt close perfect. Case is half way up the neck with 85 grains so most likely will need a slightly faster powder to get much more speed. We might be able to vibrate another 3 grains in there and compress it in there. It will be a few weeks before we get out again. Suppressor changes point of impact 4" vertically. Sounds like a giant air rifle. Made the whole range shut down. They all thought it was a squib load. All speed tests were done with the YHM QD muzzle brake attached. Recoil was next to nothing. Now it's going to be time consuming part as we explore the powders to find one that fits yet is still burning to the end of the 30" barrel. I wonder just how flat a 3800+ fps 110 Accubond really will fly. [/QUOTE]
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