Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advanced Ballistics Questions Regarding Sean Kennedy's Shooter Program
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="royinidaho" data-source="post: 840392" data-attributes="member: 2011"><p>Been here and done this. The tee shirt is full of holes.</p><p></p><p>You are headed in the right direction.</p><p></p><p>The "Shooter" program is trustworthy for many users, including me, to well beyond the mile mark and all distances between that and zero distance.</p><p></p><p>I started by doing actual drops at accurately measured distances out to 1000 yards.</p><p></p><p>I then plugged distance and drops in MS Exel and did the curve fit thing. The resulting eq'n was spot on at all distances under conditions identical to the conditions the day the drops were calculated.</p><p></p><p>This method disregards all specific (important) variables. Barometric pressure, temperature, elevation, velocity and all other variables. A great exercise but completely useless for real world use.</p><p></p><p>Our most untrustworthy piece of equipment is the chronograph. I use a Beta Chrony and only then for Extreme Spread for a given string of shots. Velocity measurements can only be considered "in the ball park." Tilt it slightly between shots/sessions and things get pretty spread out.</p><p></p><p>Variable bc is the better way to go. Each rifle barrel creates a different bc as compared to another barrel with the same bullet.</p><p></p><p>It takes a bit of shooting to determine long range bc changes. If the rifle is ELR accurate one or two shots at each distance is adequate.</p><p></p><p>Variable bc and "fudging" MV will get you spot on for as small of target as you desire at any range.</p><p></p><p>I think it was winmag that said "Who cares what the MV used by the program is, just so you hit what you're shootin' at." I concur.</p><p></p><p>With my two ELR rifles, Shooter inputs were very straight forward and have been validated in various elevations, temperatures, atmos pressures, shot angles and distances to ELR.</p><p></p><p>However, my 270 Win is another story. I have to knock off 200 to 250 FPS MV to get drops to line up with software predictions.</p><p></p><p>This just popped into my head and was the final "precise" input that brought things together big time.</p><p></p><p>How accurate is you line of sight/line of bore measurement? This is a straight forward measurement for non-canted scope mounts. And needs to be "fudged" for bases that are canted.</p><p></p><p>When this value is "off" affects get worse as distance increases has been my experience.</p><p></p><p>HTH and keep at it.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="royinidaho, post: 840392, member: 2011"] Been here and done this. The tee shirt is full of holes. You are headed in the right direction. The "Shooter" program is trustworthy for many users, including me, to well beyond the mile mark and all distances between that and zero distance. I started by doing actual drops at accurately measured distances out to 1000 yards. I then plugged distance and drops in MS Exel and did the curve fit thing. The resulting eq'n was spot on at all distances under conditions identical to the conditions the day the drops were calculated. This method disregards all specific (important) variables. Barometric pressure, temperature, elevation, velocity and all other variables. A great exercise but completely useless for real world use. Our most untrustworthy piece of equipment is the chronograph. I use a Beta Chrony and only then for Extreme Spread for a given string of shots. Velocity measurements can only be considered "in the ball park." Tilt it slightly between shots/sessions and things get pretty spread out. Variable bc is the better way to go. Each rifle barrel creates a different bc as compared to another barrel with the same bullet. It takes a bit of shooting to determine long range bc changes. If the rifle is ELR accurate one or two shots at each distance is adequate. Variable bc and "fudging" MV will get you spot on for as small of target as you desire at any range. I think it was winmag that said "Who cares what the MV used by the program is, just so you hit what you're shootin' at." I concur. With my two ELR rifles, Shooter inputs were very straight forward and have been validated in various elevations, temperatures, atmos pressures, shot angles and distances to ELR. However, my 270 Win is another story. I have to knock off 200 to 250 FPS MV to get drops to line up with software predictions. This just popped into my head and was the final "precise" input that brought things together big time. How accurate is you line of sight/line of bore measurement? This is a straight forward measurement for non-canted scope mounts. And needs to be "fudged" for bases that are canted. When this value is "off" affects get worse as distance increases has been my experience. HTH and keep at it.:) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advanced Ballistics Questions Regarding Sean Kennedy's Shooter Program
Top