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Rifles, Reloading, Optics, Equipment
Reloading
New 300 WinMag 215 Bergers
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<blockquote data-quote="Goldy300" data-source="post: 1523468" data-attributes="member: 104909"><p>So I recently finished building my 300 WinMag. It is Defiance Action, Manners stock, 28" Proof CF 1:9 twist barrel. I set out to do a load developement with 215 Bergers and found myself confused. </p><p></p><p>Load = Hornady Brass, 215M primers, CBTO 2.95 .010 off the lands. It has custom throat. </p><p>I started with 74.5 grains and worked up. 77, 77.5, 78, 78.5 and STILL NO real pressure signs. Maybe a "hint" of flattened primers. Velocities increased as one would expect in a ladder test until...</p><p></p><p>77.5gr 2980fps ES=8 SD=3</p><p>78gr 2966fps ES=36 SD=21</p><p>78.5gr 3022fps ES=33 SD=17</p><p></p><p>It was weird to see velocity DECREASE. My question is...Is my high accuracy node gonna be around 77.5gr or do I keep going up looking for signs (ejector marks/heavy bolt lift)?</p><p></p><p>I know Broz has a handle on 215 Bergers and 300 WinMag but anyone with insight is appreciated. Also I know Hornady brass is no desired but I have over 300 rounds of once fired from previous build I am full length sizing. Thanks</p></blockquote><p></p>
[QUOTE="Goldy300, post: 1523468, member: 104909"] So I recently finished building my 300 WinMag. It is Defiance Action, Manners stock, 28” Proof CF 1:9 twist barrel. I set out to do a load developement with 215 Bergers and found myself confused. Load = Hornady Brass, 215M primers, CBTO 2.95 .010 off the lands. It has custom throat. I started with 74.5 grains and worked up. 77, 77.5, 78, 78.5 and STILL NO real pressure signs. Maybe a “hint” of flattened primers. Velocities increased as one would expect in a ladder test until... 77.5gr 2980fps ES=8 SD=3 78gr 2966fps ES=36 SD=21 78.5gr 3022fps ES=33 SD=17 It was weird to see velocity DECREASE. My question is...Is my high accuracy node gonna be around 77.5gr or do I keep going up looking for signs (ejector marks/heavy bolt lift)? I know Broz has a handle on 215 Bergers and 300 WinMag but anyone with insight is appreciated. Also I know Hornady brass is no desired but I have over 300 rounds of once fired from previous build I am full length sizing. Thanks [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New 300 WinMag 215 Bergers
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