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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity swing in 7mm wsm with IMR 7828ssc
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<blockquote data-quote="Hiwayman92" data-source="post: 1165921" data-attributes="member: 85098"><p>I think I figured out my problem. As I slowly hand trickle powder into the tray on my scale, it's not coming up accurately. Today I was careful to measure each charge, then tick the scale to settle the needle again. Some times it was right on, some times up to .3 grains heavy. I loaded h1000 today due to the lower Es I experienced yesterday, and got an Es of 43 with 65.5 grains, 20 with 66 grains, 12 with 66.5 grains, and 9 with 67 grains. Another interesting thing I found, is speed was only an average of 2 fps slower with 66 grains than 67. 66 was actually 11 fps faster than 66.5 grains. Weird... Also, this is my first long throated rifle. All the load data I've found shows saami lengths. I see no pressure signs yet, am I correct in assuming that when I'm seating out to 3.105 instead of 2.860 i will have less pressure and velocity with the same charge? If so I need to keep working up, since I'm only getting 2843 fps with a 180 Berger at 7,200 altitude.</p></blockquote><p></p>
[QUOTE="Hiwayman92, post: 1165921, member: 85098"] I think I figured out my problem. As I slowly hand trickle powder into the tray on my scale, it's not coming up accurately. Today I was careful to measure each charge, then tick the scale to settle the needle again. Some times it was right on, some times up to .3 grains heavy. I loaded h1000 today due to the lower Es I experienced yesterday, and got an Es of 43 with 65.5 grains, 20 with 66 grains, 12 with 66.5 grains, and 9 with 67 grains. Another interesting thing I found, is speed was only an average of 2 fps slower with 66 grains than 67. 66 was actually 11 fps faster than 66.5 grains. Weird... Also, this is my first long throated rifle. All the load data I've found shows saami lengths. I see no pressure signs yet, am I correct in assuming that when I'm seating out to 3.105 instead of 2.860 i will have less pressure and velocity with the same charge? If so I need to keep working up, since I'm only getting 2843 fps with a 180 Berger at 7,200 altitude. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Velocity swing in 7mm wsm with IMR 7828ssc
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