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Rifles, Reloading, Optics, Equipment
Reloading
beginning of case head separation?
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<blockquote data-quote="scottishkat" data-source="post: 1227280" data-attributes="member: 82202"><p>I am surprised to see that big a difference in their new data. The info I gave was from the number 4 hard copy that I have. The odd thing I notice is the significant drop for the 180 TSX which is the same bullet the MRX in my number 4 has a different BC than the ttsx on line. But there is an increase on line for the 165/168 from 75 to 76.1 </p><p> </p><p>Look at the huge difference between the 175 and the 180 with RL22 on line.</p><p> </p><p>I'm puzzled now. Which load was giving the stiff bolt lift the 64 or the 66gr?</p><p> </p><p>I still think you may be dealing with lower pressure what is the weight of the brass you are firing? There can be significant differences in brass weight and I am wondering if Barnes used heavier brass in the new load data. The European brass in 300 win mag can weigh 30 or more grains than the win and nosler brass.</p><p> For instance my nosler cases weigh 215gr and the PPU weigh 240gr.</p><p> </p><p>I note Norma publishes 2 different sets of load data for 300 win mag now 1 for cases that weigh up to 270 gr and the other light for 215gr there is about 5 gr in the difference. The hornady brass I have weighs 235 gr.</p><p> </p><p>This reduces the capacity of the case thereby creating higher pressures.</p><p> </p><p>I am thinking this may be the difference in the data.</p><p> </p><p>Maybe a call to barnes is in order</p><p> </p><p>Bob</p></blockquote><p></p>
[QUOTE="scottishkat, post: 1227280, member: 82202"] I am surprised to see that big a difference in their new data. The info I gave was from the number 4 hard copy that I have. The odd thing I notice is the significant drop for the 180 TSX which is the same bullet the MRX in my number 4 has a different BC than the ttsx on line. But there is an increase on line for the 165/168 from 75 to 76.1 Look at the huge difference between the 175 and the 180 with RL22 on line. I'm puzzled now. Which load was giving the stiff bolt lift the 64 or the 66gr? I still think you may be dealing with lower pressure what is the weight of the brass you are firing? There can be significant differences in brass weight and I am wondering if Barnes used heavier brass in the new load data. The European brass in 300 win mag can weigh 30 or more grains than the win and nosler brass. For instance my nosler cases weigh 215gr and the PPU weigh 240gr. I note Norma publishes 2 different sets of load data for 300 win mag now 1 for cases that weigh up to 270 gr and the other light for 215gr there is about 5 gr in the difference. The hornady brass I have weighs 235 gr. This reduces the capacity of the case thereby creating higher pressures. I am thinking this may be the difference in the data. Maybe a call to barnes is in order Bob [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
beginning of case head separation?
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