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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
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<blockquote data-quote="benchracer" data-source="post: 1342792" data-attributes="member: 22069"><p>It has been a lot longer than I had hoped for, since my last testing session. Range time has been at a premium over the course of the last month. Life keeps getting in the way of my hobbies!</p><p></p><p>I have not yet progressed to accuracy tuning, but I have done enough testing to develop a pretty good idea of where MAX is, with several different bullets and powders, in my rifle.</p><p></p><p>Regrettably, the FIRST thing I learned is that PRVI brass isn't going to cut it. My high hopes for this brass were dashed when I started getting hard bolt lift and difficult extraction at starting loads, with no other pressure signs. My best guess, without sectioning the cases, is that there isn't enough material in the case head. That may also account for the extra capacity in the PRVI cases vs Norma cases.</p><p></p><p>I continued my work, using only Norma cases, and they are working out well, though they are taking a beating. By the time my testing is complete, I will have to fireform a new batch of cases for field use. At some point in the future, I intend to obtain some RWS brass and work with it. It has a reputation for Lapua-like toughness, which I expect to prove useful, despite reduced capacity relative to the Norma cases.</p><p></p><p><strong>BERGER 250 ELITE HUNTER</strong></p><p><strong></strong></p><p>i am starting with the 250 EH because elkaholic designed the 338 Sherman around this bullet and because it is showing itself to be an excellent bullet. The more I shoot it, the more it impresses me. I measured COAL to the lands @ 3.575 and loaded my test rounds .010 off the lands @ 3.565.</p><p></p><p><u>RL-17</u></p><p>60.0 2730</p><p>61.0 2751</p><p>62.0 2804 Light ejector mark.</p><p>63.0 2839 Bright, shiny ejector mark.</p><p>64.0 Did not shoot, based on pressure signs @ 63.0.</p><p></p><p><u>H100V</u></p><p>61.0 2701</p><p>62.0 2754</p><p>63.0 2776</p><p>64.0 2818 Shiny ejector mark.</p><p>65.0 Discontinued test.</p><p></p><p><u>RL-26 (Win LR Mag primers)</u></p><p>68.0 2751</p><p>69.0 2805</p><p>70.0 2813</p><p>71.0 2852 Light ejector mark.</p><p>72.0 2881 Heavy bolt lift. Hard extraction. Bright, shiny ejector mark.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1342792, member: 22069"] It has been a lot longer than I had hoped for, since my last testing session. Range time has been at a premium over the course of the last month. Life keeps getting in the way of my hobbies! I have not yet progressed to accuracy tuning, but I have done enough testing to develop a pretty good idea of where MAX is, with several different bullets and powders, in my rifle. Regrettably, the FIRST thing I learned is that PRVI brass isn't going to cut it. My high hopes for this brass were dashed when I started getting hard bolt lift and difficult extraction at starting loads, with no other pressure signs. My best guess, without sectioning the cases, is that there isn't enough material in the case head. That may also account for the extra capacity in the PRVI cases vs Norma cases. I continued my work, using only Norma cases, and they are working out well, though they are taking a beating. By the time my testing is complete, I will have to fireform a new batch of cases for field use. At some point in the future, I intend to obtain some RWS brass and work with it. It has a reputation for Lapua-like toughness, which I expect to prove useful, despite reduced capacity relative to the Norma cases. [B]BERGER 250 ELITE HUNTER [/B] i am starting with the 250 EH because elkaholic designed the 338 Sherman around this bullet and because it is showing itself to be an excellent bullet. The more I shoot it, the more it impresses me. I measured COAL to the lands @ 3.575 and loaded my test rounds .010 off the lands @ 3.565. [U]RL-17[/U] 60.0 2730 61.0 2751 62.0 2804 Light ejector mark. 63.0 2839 Bright, shiny ejector mark. 64.0 Did not shoot, based on pressure signs @ 63.0. [U]H100V[/U] 61.0 2701 62.0 2754 63.0 2776 64.0 2818 Shiny ejector mark. 65.0 Discontinued test. [U]RL-26 (Win LR Mag primers)[/U] 68.0 2751 69.0 2805 70.0 2813 71.0 2852 Light ejector mark. 72.0 2881 Heavy bolt lift. Hard extraction. Bright, shiny ejector mark. [/QUOTE]
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338 Sherman Build (This Is My Boomstick!)
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