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Rifles, Reloading, Optics, Equipment
Reloading
Berger 215's in 300 win mag
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<blockquote data-quote="Broz" data-source="post: 848481" data-attributes="member: 7503"><p>MM, I agree ,,,but,, It usually takes 3 gr less in RWS brass due to the reduced volume and case fill, pressure shows up earlier. But at some point the larger charge usually over rides the spike from less case volume and the case with more capacity will produce more velocity. How much remains to be seen. An extreme example would be the RUM and 30-378. What I have seen with these Win cases and this exact bullet is RWS 74 gr WW 77 or 78 gr for a max with the WW having more velocity. All rifles are different, reamer throat length and seating depth will play a role here too. So we start low and work up to see what we get. </p><p> </p><p>I do like to use a Chronograph, but in the end the drop are what we care about. I prefer to check drops on a vertical surface like paper or steel, but a vertical rock wall will work too. The advertised G7 BC of the bullet here (215 Berger) has been very accurate through the entire velocity range of the 300 win for us. With several rifles set up and checked, it has been a very good combination. Silly accurate to 12 or 1300 yards and still inside 1 moa at a mile in my rifle. So, as long as we are using a vertical surface to shoot groups, and can measure group center to point of aim with a tape or accurate measure of some sort. I prefer to go with real world data and use my chronographs to get me a close starting point. In the end if the rifle and ballistic app match that is what we really need.</p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 848481, member: 7503"] MM, I agree ,,,but,, It usually takes 3 gr less in RWS brass due to the reduced volume and case fill, pressure shows up earlier. But at some point the larger charge usually over rides the spike from less case volume and the case with more capacity will produce more velocity. How much remains to be seen. An extreme example would be the RUM and 30-378. What I have seen with these Win cases and this exact bullet is RWS 74 gr WW 77 or 78 gr for a max with the WW having more velocity. All rifles are different, reamer throat length and seating depth will play a role here too. So we start low and work up to see what we get. I do like to use a Chronograph, but in the end the drop are what we care about. I prefer to check drops on a vertical surface like paper or steel, but a vertical rock wall will work too. The advertised G7 BC of the bullet here (215 Berger) has been very accurate through the entire velocity range of the 300 win for us. With several rifles set up and checked, it has been a very good combination. Silly accurate to 12 or 1300 yards and still inside 1 moa at a mile in my rifle. So, as long as we are using a vertical surface to shoot groups, and can measure group center to point of aim with a tape or accurate measure of some sort. I prefer to go with real world data and use my chronographs to get me a close starting point. In the end if the rifle and ballistic app match that is what we really need. Jeff [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Berger 215's in 300 win mag
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