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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic calculator issues
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<blockquote data-quote="A/1-61" data-source="post: 2931965" data-attributes="member: 127316"><p>I have run into the same issue with my 7mm STW. It could have to do with BC, twist, the actual rifle your using, etc. I have the luxury of owning property at sea level in coastal Maine where I have a range that goes back 600 yds on my property. I start out by inputting my ballistic software for a starting point, then I get actual data at 100, 300, 500, and 600 yards. I use the actual shooting data to develop a new curve by tweaking the input values for velocity, BC, in my Sierra software. I do whatever it takes. When I finally come up with a new curve that mimics my actual shooting data, I just adjust the elevation from sea level to wherever I'm hunting and make a range card for the MOA adjustments of my ballistic turret. This year, I hunted Utah at 10,000 ft above sea level. When I got to Utah, I found a range in Vernal at 6000 ft. This was the final test of my adjustments. I fired at steel elk silhouette targets at 870 yards and 1080 yd and hit the center of the vital zone of both targets. Bottom line, Nothing can replace your "at the range data".</p></blockquote><p></p>
[QUOTE="A/1-61, post: 2931965, member: 127316"] I have run into the same issue with my 7mm STW. It could have to do with BC, twist, the actual rifle your using, etc. I have the luxury of owning property at sea level in coastal Maine where I have a range that goes back 600 yds on my property. I start out by inputting my ballistic software for a starting point, then I get actual data at 100, 300, 500, and 600 yards. I use the actual shooting data to develop a new curve by tweaking the input values for velocity, BC, in my Sierra software. I do whatever it takes. When I finally come up with a new curve that mimics my actual shooting data, I just adjust the elevation from sea level to wherever I'm hunting and make a range card for the MOA adjustments of my ballistic turret. This year, I hunted Utah at 10,000 ft above sea level. When I got to Utah, I found a range in Vernal at 6000 ft. This was the final test of my adjustments. I fired at steel elk silhouette targets at 870 yards and 1080 yd and hit the center of the vital zone of both targets. Bottom line, Nothing can replace your "at the range data". [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic calculator issues
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