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
The Basics, Starting Out
Twist rate = Grain
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="Hugnot" data-source="post: 2743257" data-attributes="member: 115658"><p>Overall length of bullet, like from base to tip but subtract length plastic tips. Goto JBM - there are other bullets than the spendy Bergers.</p><p></p><p>For example:</p><p></p><p>[ATTACH=full]438011[/ATTACH]</p><p></p><p>These are some common .308 Hornady hunting bullets that would work in a 12 twist .308, except the pointy 165 Nosler RDF. 12 twist, that would have marginal stability at cold heavy air. I ran the Sg program using 35 deg F because I thought this would be common for shooting deers & such at colder hunting season temps. Should you shoot the deers at high elevations decrease the pressure. Temperature & pressure have minor effects on Sg compared with twist rate & length. Most .308 hunting rifles are intended for use under 300 yards so I skipped heavier & real pointy match bullets. A .308, 150 grain bullet at almost 2900 fps mv kills deers real good. Some bullets might have marginal Sg values & fail to have adequate stability under certain conditions, like cold heavy air. I like the .308 150 SST for shooting deers & under and have had real good results on long range rodents using it in a .308 W.</p><p></p><p>The twist rate of the Tika must be known - from manufacturers stats or by measuring it.</p><p>Tape measure, tape, felt tip pen, cleaning rod with lightly lubricated tight fitting patch. Place a strip of tape on back end of cleaning rod, draw line on tape with felt tip, run rod with tight patch into bore, mark reference point on tape with selected feature on rifle, pull back rod & stop when line on tape has made 1 revolution, measure distance between 1st reference point & second reference point (common to same feature on receiver.</p><p></p><p>Hammer forged rifling is consistent from bore to bore. Button rifling may vary. Stats might be incorrect. Verify is good. Don't buy lots of bullet that won't shoot good (inadequate stability, like under Sg 1.4)</p><p></p><p>The Miller stability, or Sg calculator, is used by JBM & Berger. For a more definitive approach look at:</p><p></p><p>[URL unfurl="true"]https://www.hornady.com/team-hornady/ballistic-calculators/#!/[/URL]</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2743257, member: 115658"] Overall length of bullet, like from base to tip but subtract length plastic tips. Goto JBM - there are other bullets than the spendy Bergers. For example: [ATTACH type="full" alt="Screenshot (574).png"]438011[/ATTACH] These are some common .308 Hornady hunting bullets that would work in a 12 twist .308, except the pointy 165 Nosler RDF. 12 twist, that would have marginal stability at cold heavy air. I ran the Sg program using 35 deg F because I thought this would be common for shooting deers & such at colder hunting season temps. Should you shoot the deers at high elevations decrease the pressure. Temperature & pressure have minor effects on Sg compared with twist rate & length. Most .308 hunting rifles are intended for use under 300 yards so I skipped heavier & real pointy match bullets. A .308, 150 grain bullet at almost 2900 fps mv kills deers real good. Some bullets might have marginal Sg values & fail to have adequate stability under certain conditions, like cold heavy air. I like the .308 150 SST for shooting deers & under and have had real good results on long range rodents using it in a .308 W. The twist rate of the Tika must be known - from manufacturers stats or by measuring it. Tape measure, tape, felt tip pen, cleaning rod with lightly lubricated tight fitting patch. Place a strip of tape on back end of cleaning rod, draw line on tape with felt tip, run rod with tight patch into bore, mark reference point on tape with selected feature on rifle, pull back rod & stop when line on tape has made 1 revolution, measure distance between 1st reference point & second reference point (common to same feature on receiver. Hammer forged rifling is consistent from bore to bore. Button rifling may vary. Stats might be incorrect. Verify is good. Don't buy lots of bullet that won't shoot good (inadequate stability, like under Sg 1.4) The Miller stability, or Sg calculator, is used by JBM & Berger. For a more definitive approach look at: [URL unfurl="true"]https://www.hornady.com/team-hornady/ballistic-calculators/#!/[/URL] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
The Basics, Starting Out
Twist rate = Grain
Top