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Rifles, Reloading, Optics, Equipment
Reloading
IMR 4451 and 300 WSM data
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<blockquote data-quote="Shortmagman" data-source="post: 1059479" data-attributes="member: 10723"><p>screamrider,</p><p></p><p>The simple answer is that bullets are made different. Even the copper ones we are talking about are different. Example the Barnes TSX an TTSX have groves that reduce the pressure. Because of the surface area of the bullet that comes in contact with the barrel is different with different bullets you get more or less pressure. It is more that just the weight of the bullet. </p><p></p><p>Of course there are other factors, too many to mention in this short answer.</p><p></p><p>The thing to do to keep safe is to use good data from good sources, and follow it.</p><p></p><p>Use the brass that was used and the primers that was used when the data was collected. Start low and work up! Don't every start with the max load.</p><p></p><p>No you are not missing something. You just cannot simply use all data for all 180 grain bullets. From my experience and from the data I have looked at the 180 TTSX bullets come very close to needing the same data as other 180 grain lead bullets. With the Nosler E-tip and some other solid copper bullets you need to use data developed for that bullet.</p><p></p><p>You asked about the data from Barnes and the Hodgdon web site. As I stated above the Nolser E-tip and the TTSX bullet are different. If you were to use either data you would have been ok. because the starting load was 60.0 for one and 59.0 grains for the other. If you use the starting load and watch for presssure signs you will be fine.</p></blockquote><p></p>
[QUOTE="Shortmagman, post: 1059479, member: 10723"] screamrider, The simple answer is that bullets are made different. Even the copper ones we are talking about are different. Example the Barnes TSX an TTSX have groves that reduce the pressure. Because of the surface area of the bullet that comes in contact with the barrel is different with different bullets you get more or less pressure. It is more that just the weight of the bullet. Of course there are other factors, too many to mention in this short answer. The thing to do to keep safe is to use good data from good sources, and follow it. Use the brass that was used and the primers that was used when the data was collected. Start low and work up! Don't every start with the max load. No you are not missing something. You just cannot simply use all data for all 180 grain bullets. From my experience and from the data I have looked at the 180 TTSX bullets come very close to needing the same data as other 180 grain lead bullets. With the Nosler E-tip and some other solid copper bullets you need to use data developed for that bullet. You asked about the data from Barnes and the Hodgdon web site. As I stated above the Nolser E-tip and the TTSX bullet are different. If you were to use either data you would have been ok. because the starting load was 60.0 for one and 59.0 grains for the other. If you use the starting load and watch for presssure signs you will be fine. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
IMR 4451 and 300 WSM data
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