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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 mm SHERMAN SHORTMAG vs 7 SAUM
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<blockquote data-quote="Rardoin" data-source="post: 1948724" data-attributes="member: 114954"><p>I sat down to load up another charge test to attempt to improve on the unacceptable vertical dispersion I had at the 1000yd match. I realized two major screw ups in my match loads. Due to having my neck expander die still set for the .284 I was only sizing the upper 1/2 of the neck leaving the lower 1/2 0.006" too tight. I suspected something funky with my seating pressures but was out of time to investigate. Another screw up was looking at my 190 Berger LRH cbto number and using it on the A tips (.030" closer to the lands than ideal). It's a wonder I didn't place 10/10! Retested today with prepped cases and proper seating depths but only went out to 300yds because of the breeze. Still very encouraging and picked up a little velocity with the proper neck tension.</p><p>190 A-tips at 2770:</p><p>[ATTACH=full]205557[/ATTACH]</p><p></p><p>[ATTACH=full]205547[/ATTACH]</p><p></p><p></p><p>190 Berger LRH fire forming at 2670 fps:</p><p></p><p>[ATTACH=full]205558[/ATTACH]</p><p>[ATTACH=full]205550[/ATTACH]</p><p></p><p></p><p>I still need to test fine charges on each side of these nodes and revisit finer seating depth increments. The 7 SS is certainly holding its reputation as being and easy cartridge to tune. I'll shoot a 600yd match this weekend and we'll see what happens. I'm very encouraged.</p></blockquote><p></p>
[QUOTE="Rardoin, post: 1948724, member: 114954"] I sat down to load up another charge test to attempt to improve on the unacceptable vertical dispersion I had at the 1000yd match. I realized two major screw ups in my match loads. Due to having my neck expander die still set for the .284 I was only sizing the upper 1/2 of the neck leaving the lower 1/2 0.006” too tight. I suspected something funky with my seating pressures but was out of time to investigate. Another screw up was looking at my 190 Berger LRH cbto number and using it on the A tips (.030” closer to the lands than ideal). It’s a wonder I didn’t place 10/10! Retested today with prepped cases and proper seating depths but only went out to 300yds because of the breeze. Still very encouraging and picked up a little velocity with the proper neck tension. 190 A-tips at 2770: [ATTACH type="full"]205557[/ATTACH] [ATTACH type="full" alt="FE399974-BD1B-4FF1-B498-2FBAD131568E.jpeg"]205547[/ATTACH] 190 Berger LRH fire forming at 2670 fps: [ATTACH type="full"]205558[/ATTACH] [ATTACH type="full" alt="3E18C84A-5563-4DED-B2F9-FC990C552764.jpeg"]205550[/ATTACH] I still need to test fine charges on each side of these nodes and revisit finer seating depth increments. The 7 SS is certainly holding its reputation as being and easy cartridge to tune. I’ll shoot a 600yd match this weekend and we’ll see what happens. I’m very encouraged. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7 mm SHERMAN SHORTMAG vs 7 SAUM
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