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
Hunting
Long Range Hunting & Shooting
100yds sub MOA 800yds a joke
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="tim_w" data-source="post: 1347061" data-attributes="member: 11132"><p>As I understand it, the force of resistance from super sonic flight where the focus of main resistance is on the bullet tip. Therefore it causes flight speed to decay drastically. The bullets rotational speed is not hugely effected by the super sonic flight friction comparatively as it is with downrange velocity between super sonic and subsonic. Therefore the ratio of rev:vel grows. Obviously as vel decays you do need more twist just as we can slightly compensate for a small lack of barrel twist to achieve stability with a increase in MV. The real experts in this area would by Brian Litz and the guys at AB. </p><p></p><p></p><p>Couple ideas that could be the issue with groups if all mechincal issue posibilities have been checked. Many bullet designs do not do well cross thru transonic to sonic from super sonic. I did not look up the that bullet combo. Many people forget to include the increase in shoot margin of error as well as small variation that can be hidden in the measurement of the group. Then include the environmental and its easy to see a 0.5 moa group @100 being a .75 moa group @ 800 depending on those variables. I have also seen with the longer high BC groups actually tighten up a bit in moa by very good shooters i.e. bullet going to sleep range. As has been mentioned the amount of ES is going to have a more pronouced effect as distance increases. My SWAG is its a combo of a few or all of these factors.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1347061, member: 11132"] As I understand it, the force of resistance from super sonic flight where the focus of main resistance is on the bullet tip. Therefore it causes flight speed to decay drastically. The bullets rotational speed is not hugely effected by the super sonic flight friction comparatively as it is with downrange velocity between super sonic and subsonic. Therefore the ratio of rev:vel grows. Obviously as vel decays you do need more twist just as we can slightly compensate for a small lack of barrel twist to achieve stability with a increase in MV. The real experts in this area would by Brian Litz and the guys at AB. Couple ideas that could be the issue with groups if all mechincal issue posibilities have been checked. Many bullet designs do not do well cross thru transonic to sonic from super sonic. I did not look up the that bullet combo. Many people forget to include the increase in shoot margin of error as well as small variation that can be hidden in the measurement of the group. Then include the environmental and its easy to see a 0.5 moa group @100 being a .75 moa group @ 800 depending on those variables. I have also seen with the longer high BC groups actually tighten up a bit in moa by very good shooters i.e. bullet going to sleep range. As has been mentioned the amount of ES is going to have a more pronouced effect as distance increases. My SWAG is its a combo of a few or all of these factors. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
100yds sub MOA 800yds a joke
Top