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
Help Needed with LB3.0 and .338 Bergers
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="Eaglet" data-source="post: 397156" data-attributes="member: 3756"><div style="text-align: left"><img src="http://pages.sbcglobal.net/jomoncada/LRH/Jeff_Adjusted.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></div><p></p><p> </p><div style="text-align: left">I will try to explain what I did; you got to promise me you won't shoot me! That's for you Jeff! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></div><p></p><p> </p><p> </p><p></p><p>I asked my self, what are the positive things in this project? The answers came right along.</p><ul> <li data-xf-list-type="ul"><div style="text-align: left">Broz is a great shot with good equipment</div> </li> <li data-xf-list-type="ul"><div style="text-align: left">I have an awesome Ballistic Program to work with</div> </li> <li data-xf-list-type="ul"><div style="text-align: left">Bryan Litz G7 BC are mighty trustable and...</div> </li> <li data-xf-list-type="ul"><div style="text-align: left">I can pray to have the Lord help me.</div> </li> </ul> <div style="text-align: left">Then I though, what are the things that are bothering me about this project... The answer jumped in front of me... <strong>MV!!!!!</strong> After looking at all the data and the different results I was convinced that something was very wrong and it had to be the muzzle velocity... no doubt!!!</div><p></p><p> </p><p> </p><p> </p><div style="text-align: left">**************************************** </div><p></p><div style="text-align: left">I gave load base the zero info and assumed the the conditions were the same as the first two set-ups at 700 yd and 1042 yards.</div><p></p><p> </p><div style="text-align: left"><strong>Note:</strong> LB3.0 uses angles for wind directions. 5 minutes is 30° or 2 O'clock is 60° 11 O'Clock is 330°. Personally I like the clocks better. Just keep this in mind.</div><p></p><div style="text-align: left">For 700 yards, I used a 0° wind direction (12 O'clock) at 3.0 mph; LB3.0 says to go up <strong>10.3 moa</strong>. Broz used 10.5 moa and was 2.5 inches low. So... 0.2 moa higher than what he needed means <strong>(0.2*1.047*7) = 1.47"</strong> It should have been <strong>1.5 + 2.5 = 4.0"</strong> low. In all truthfulness Broz was 4.0" low at 700 yards. Now, 4" at 700 yards means (4/1.047/7) = <strong>0.5</strong> <strong>moa.</strong> Then 10.3 moa (the original drop) + 0.5 moa (the adjustment) would need a total of <strong>10.8 moa</strong> <strong>to be right on target at 700 yards.</strong></div><p></p><div style="text-align: left">Great, I need to start dropping my MV until I get to need 10.8 moa and then compare it to the next two shooting settings and continue wit my adjustments. <span style="color: red"><span style="font-family: 'Verdana'">But before I started dropping the MV, </span></span>I decided I needed to know what my come ups would have to be for 1042 yard and 1342 yards.</div><p></p><div style="text-align: left">Let's do the next one...</div><p></p><div style="text-align: left">With the exact same info in LB3.0 I changed the wind speed and direction to 5 mph at 0° again. LB.3.0 said I needed 21.1 moa to be on target. Broz used 21.75 moa; he used 0.65 moa more which means he should have hit 7.1" higher at 1042 yards. (0.65*1.047*10.42) = 7.09"</div><p></p><div style="text-align: left">The center of his group was 10" low. Let's add 10 + 7.1 = 17.5" I would need to come up 1.6 moa more and that'd be a total of <strong>22.7 moa at 1042 yards</strong>.</div><p></p><div style="text-align: left">Now the last one...</div><p></p><div style="text-align: left">I turned on the field conditions because the environment conditions changed. I keyed in the new conditions, entered the 330° for wind direction and 6 mph velocity.</div><p></p><div style="text-align: left">LB3.0 said that I need 32.5 moa. Broz used 34.25 and was 5" low. Now he used 1.75 moa more than it called for to still be 5" low... So 1.75moa*1.047*13.42 = 24.6" at 1342 yards plus (+) 5" = 29.6" which is 29.6/1.047/13.42 = 2.1 moa. Now 2.1 moa + 32.5 = <strong>34.6 moa for total corrected adjustment.</strong></div><p></p><div style="text-align: left">******************************************************'</div><p></p><p>AT this point I need to bring my MV down and play with BC and DC to be able to obtain as close as possible come ups the would look like so:</p><p> </p><div style="text-align: left"><strong><em>700 yards would have to say -10.8 moa</em></strong></div><p></p><div style="text-align: left"><strong><em>1042 yards would have to say -22.7 moa</em></strong></div><p></p><div style="text-align: left"><strong><em>1342 yards would have to say -34.6 moa</em></strong></div><p></p><div style="text-align: left">ARE YOU READY TO BE SHOCKED!!! HERE WE GO!!!!</div><p></p><div style="text-align: left"><u><span style="color: #0000ff"><img src="http://i46.tinypic.com/2af05mc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></u></div><p></p><div style="text-align: left"><span style="color: #0000ff"><span style="color: black">When using the muzzle</span> velocity of 2705 fps and without changing the G7 BC's value and setting the DC = 0.492 The following results are obtain:</span></div><p></p><div style="text-align: left"></div><p><img src="http://i50.tinypic.com/2cyla9u.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><div style="text-align: left"><span style="color: #0000ff">If we had used the Coriolis effect it would probably be even more adequate.</span></div><p></p><div style="text-align: left"><span style="color: #0000ff">Remember to change the wind direction and speed as well as turning on the field conditions for the last group at 1342 yards since the conditions were different.</span></div><p></p><div style="text-align: left"><span style="color: #0000ff">Cant wait till you check it and let us know what it does.</span></div><p></p><div style="text-align: left"><span style="color: #0000ff">The new muzzle velocity does make sense to me since you're using 91.5 grains of H1000 and you're barrel is 28.5 inches long.</span></div><p></p><div style="text-align: left"><span style="color: #0000ff">In all my calculations there was an extra step that I did, I did not have to do it, just because I wanted to make sure that all was being referenced to LB3.0 original drop info.</span></div><p></p><div style="text-align: left"><span style="color: #0000ff">Well I do hope this works!!!</span></div></blockquote><p></p>
[QUOTE="Eaglet, post: 397156, member: 3756"] [LEFT][IMG]http://pages.sbcglobal.net/jomoncada/LRH/Jeff_Adjusted.jpg[/IMG][/LEFT] [LEFT]I will try to explain what I did; you got to promise me you won't shoot me! That's for you Jeff! :)[/LEFT] I asked my self, what are the positive things in this project? The answers came right along. [LIST] [*][LEFT]Broz is a great shot with good equipment[/LEFT] [*][LEFT]I have an awesome Ballistic Program to work with[/LEFT] [*][LEFT]Bryan Litz G7 BC are mighty trustable and...[/LEFT] [*][LEFT]I can pray to have the Lord help me.[/LEFT] [/LIST][LEFT]Then I though, what are the things that are bothering me about this project... The answer jumped in front of me... [B]MV!!!!![/B] After looking at all the data and the different results I was convinced that something was very wrong and it had to be the muzzle velocity... no doubt!!![/LEFT] [LEFT]**************************************** [/LEFT] [LEFT]I gave load base the zero info and assumed the the conditions were the same as the first two set-ups at 700 yd and 1042 yards.[/LEFT] [LEFT][B]Note:[/B] LB3.0 uses angles for wind directions. 5 minutes is 30° or 2 O'clock is 60° 11 O'Clock is 330°. Personally I like the clocks better. Just keep this in mind.[/LEFT] [LEFT]For 700 yards, I used a 0° wind direction (12 O'clock) at 3.0 mph; LB3.0 says to go up [B]10.3 moa[/B]. Broz used 10.5 moa and was 2.5 inches low. So... 0.2 moa higher than what he needed means [B](0.2*1.047*7) = 1.47"[/B] It should have been [B]1.5 + 2.5 = 4.0"[/B] low. In all truthfulness Broz was 4.0" low at 700 yards. Now, 4" at 700 yards means (4/1.047/7) = [B]0.5[/B] [B]moa.[/B] Then 10.3 moa (the original drop) + 0.5 moa (the adjustment) would need a total of [B]10.8 moa[/B] [B]to be right on target at 700 yards.[/B][/LEFT] [LEFT]Great, I need to start dropping my MV until I get to need 10.8 moa and then compare it to the next two shooting settings and continue wit my adjustments. [COLOR=red][FONT=Verdana]But before I started dropping the MV, [/FONT][/COLOR]I decided I needed to know what my come ups would have to be for 1042 yard and 1342 yards.[/LEFT] [LEFT]Let's do the next one...[/LEFT] [LEFT]With the exact same info in LB3.0 I changed the wind speed and direction to 5 mph at 0° again. LB.3.0 said I needed 21.1 moa to be on target. Broz used 21.75 moa; he used 0.65 moa more which means he should have hit 7.1" higher at 1042 yards. (0.65*1.047*10.42) = 7.09"[/LEFT] [LEFT]The center of his group was 10" low. Let's add 10 + 7.1 = 17.5" I would need to come up 1.6 moa more and that'd be a total of [B]22.7 moa at 1042 yards[/B].[/LEFT] [LEFT]Now the last one...[/LEFT] [LEFT]I turned on the field conditions because the environment conditions changed. I keyed in the new conditions, entered the 330° for wind direction and 6 mph velocity.[/LEFT] [LEFT]LB3.0 said that I need 32.5 moa. Broz used 34.25 and was 5" low. Now he used 1.75 moa more than it called for to still be 5" low... So 1.75moa*1.047*13.42 = 24.6" at 1342 yards plus (+) 5" = 29.6" which is 29.6/1.047/13.42 = 2.1 moa. Now 2.1 moa + 32.5 = [B]34.6 moa for total corrected adjustment.[/B][/LEFT] [LEFT]******************************************************'[/LEFT] AT this point I need to bring my MV down and play with BC and DC to be able to obtain as close as possible come ups the would look like so: [LEFT][B][I]700 yards would have to say -10.8 moa[/I][/B][/LEFT] [LEFT][B][I]1042 yards would have to say -22.7 moa[/I][/B][/LEFT] [LEFT][B][I]1342 yards would have to say -34.6 moa[/I][/B][/LEFT] [LEFT]ARE YOU READY TO BE SHOCKED!!! HERE WE GO!!!![/LEFT] [LEFT][U][COLOR=#0000ff][IMG]http://i46.tinypic.com/2af05mc.jpg[/IMG][/COLOR][/U][/LEFT] [LEFT][COLOR=#0000ff][COLOR=black]When using the muzzle[/COLOR] velocity of 2705 fps and without changing the G7 BC's value and setting the DC = 0.492 The following results are obtain:[/COLOR][/LEFT] [LEFT][COLOR=#0000ff][/COLOR][/LEFT] [IMG]http://i50.tinypic.com/2cyla9u.jpg[/IMG] [LEFT][COLOR=#0000ff]If we had used the Coriolis effect it would probably be even more adequate.[/COLOR][/LEFT] [LEFT][COLOR=#0000ff]Remember to change the wind direction and speed as well as turning on the field conditions for the last group at 1342 yards since the conditions were different.[/COLOR][/LEFT] [LEFT][COLOR=#0000ff]Cant wait till you check it and let us know what it does.[/COLOR][/LEFT] [LEFT][COLOR=#0000ff]The new muzzle velocity does make sense to me since you're using 91.5 grains of H1000 and you're barrel is 28.5 inches long.[/COLOR][/LEFT] [LEFT][COLOR=#0000ff]In all my calculations there was an extra step that I did, I did not have to do it, just because I wanted to make sure that all was being referenced to LB3.0 original drop info.[/COLOR][/LEFT] [LEFT][COLOR=#0000ff]Well I do hope this works!!![/COLOR][/LEFT] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help Needed with LB3.0 and .338 Bergers
Top