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Rifles, Reloading, Optics, Equipment
Reloading
Developing Load for 168 Berger New Brass vs Once Fired
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<blockquote data-quote="happyhunter" data-source="post: 655804" data-attributes="member: 35954"><p>Thank you for your replies. I made it back to the range and want to report back and ask another question. It looks like you guys were right and it was not necessary for me to be overly concerned about the need to fire-form my brass. Groups were measured edge to edge and then I subtracted 0.284". </p><p></p><p>Groups for once fired Rem brass were as follows: 66gr = 0.31", 68gr = 0.66", 69gr = 0.54"</p><p>Groups for virgin Nosler brass were as follows: 66gr = 0.32", 68gr = 0.70", 69gr = 0.57"</p><p> I am using a 7mm Mag with a 24 inch barrel, Nosler brass, H1000 , Winchester WLR primers, and 168 Berger VLD's.</p><p> I measured the velocity with my ProChrono for the following powder loads: 66gr at 2,637 ft/sec, 68gr at 2,700 ft/sec, and 70gr at 2797 ft/sec.</p><p> I am showing no signs of pressure with any of my powder charges between 66 and 70 gr. The expected load data that I got from Berger is as follows: with 69.5 grains H1000 in a 26" barrel I should get 2987 ft/sec and with 66g I should get 2826 ft/sec. </p><p> Why am I getting almost 200 ft/sec less? </p><p> Why am I not seeing signs of pressure because I am 0.5gr past the max load data published?</p><p> Should I try to go to higher powder loads until I see signs of pressure?</p><p> Should I switch powders to Retumbo or H4831? I saw that someone on this forum was having a hard time getting the H1000 to work in a 24in barrel even though it worked great in a 26in barrel in their hands and they had better results with H4831.</p><p> Thanks again for all your help.</p></blockquote><p></p>
[QUOTE="happyhunter, post: 655804, member: 35954"] Thank you for your replies. I made it back to the range and want to report back and ask another question. It looks like you guys were right and it was not necessary for me to be overly concerned about the need to fire-form my brass. Groups were measured edge to edge and then I subtracted 0.284". Groups for once fired Rem brass were as follows: 66gr = 0.31", 68gr = 0.66", 69gr = 0.54” Groups for virgin Nosler brass were as follows: 66gr = 0.32", 68gr = 0.70", 69gr = 0.57” I am using a 7mm Mag with a 24 inch barrel, Nosler brass, H1000 , Winchester WLR primers, and 168 Berger VLD’s. I measured the velocity with my ProChrono for the following powder loads: 66gr at 2,637 ft/sec, 68gr at 2,700 ft/sec, and 70gr at 2797 ft/sec. I am showing no signs of pressure with any of my powder charges between 66 and 70 gr. The expected load data that I got from Berger is as follows: with 69.5 grains H1000 in a 26" barrel I should get 2987 ft/sec and with 66g I should get 2826 ft/sec. Why am I getting almost 200 ft/sec less? Why am I not seeing signs of pressure because I am 0.5gr past the max load data published? Should I try to go to higher powder loads until I see signs of pressure? Should I switch powders to Retumbo or H4831? I saw that someone on this forum was having a hard time getting the H1000 to work in a 24in barrel even though it worked great in a 26in barrel in their hands and they had better results with H4831. Thanks again for all your help. [/QUOTE]
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Reloading
Developing Load for 168 Berger New Brass vs Once Fired
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