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
Target Knobs vs Clicks vs Alt. vs Temp
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="Mysticplayer" data-source="post: 85279" data-attributes="member: 8947"><p>Ric, I face the same issues in temp swings living in the wooly north. Changes in drop chart are not necessarily the fault of the scope.</p><p></p><p>I have found some barrels to change POI when they get cold. However, zero returns as the barrel heats up. Stocks can change due to temp and humidity - composite, plastic and lam stocks are usually pretty good. Ammo can change POI due to changes in powder and primer burn. I use Hodgdon Extreme powders and that seems to help with this issue.</p><p></p><p>Changes in muzzle velocity and conditions can also affect the BC of a bullet. That in turn changes your drop chart.</p><p></p><p>The clothing that you wear can affect length of pull, eye relief which can affect parallax, and how the rifle recoils. I do quite a bit of testing in the winter so that I am as bundled up as I hunt.</p><p></p><p>Finally, what you see!! Air density, humidity, and light all play with the image you see through your scope. Sighting/practising in air that has very high humidity then shooting in cold dry air will show different results simply because of the changes in what you see.</p><p></p><p>All the above plays a part in changes in your drop chart. You are right that every effort must be made to shoot in the new environment you are hunting in. A quick zero check isn't a bad idea if the rifle has seen some distance in a cargo hold or trunk.</p><p></p><p>If in doubt, a spotting shot will 'correct' for all of these little changes and confirm your impact.</p><p></p><p>Hope this helps.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 85279, member: 8947"] Ric, I face the same issues in temp swings living in the wooly north. Changes in drop chart are not necessarily the fault of the scope. I have found some barrels to change POI when they get cold. However, zero returns as the barrel heats up. Stocks can change due to temp and humidity - composite, plastic and lam stocks are usually pretty good. Ammo can change POI due to changes in powder and primer burn. I use Hodgdon Extreme powders and that seems to help with this issue. Changes in muzzle velocity and conditions can also affect the BC of a bullet. That in turn changes your drop chart. The clothing that you wear can affect length of pull, eye relief which can affect parallax, and how the rifle recoils. I do quite a bit of testing in the winter so that I am as bundled up as I hunt. Finally, what you see!! Air density, humidity, and light all play with the image you see through your scope. Sighting/practising in air that has very high humidity then shooting in cold dry air will show different results simply because of the changes in what you see. All the above plays a part in changes in your drop chart. You are right that every effort must be made to shoot in the new environment you are hunting in. A quick zero check isn't a bad idea if the rifle has seen some distance in a cargo hold or trunk. If in doubt, a spotting shot will 'correct' for all of these little changes and confirm your impact. Hope this helps. Jerry [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Target Knobs vs Clicks vs Alt. vs Temp
Top