 d_striker 
Member
Joined: Apr 2008  CO, USA
 Posts: 1488 Feedback: 0% (0) |
Posted: 2/17/2011 11:53:45 AM
[Last Edit: 2/17/2011 11:54:41 AM by d_striker]
THE IMAGE ABOVE IS A PAID ADVERTISEMENT I use or plan on using the following bullets. They are all boat tails. 175 SMK 165/180 Sierra Gameking SBT 165/180 Nosler Accubond |
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Posted: 2/17/2011 1:06:24 PM
I pay more attention to G1 vs. G7 after 1500 yds., but I shoot a fairly flat cartridge. If you 're shooting to the point where the two diverge, use the G7, otherwise don't sweat it. You should be confirming your ballistics card with range data anyway.
John |
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Posted: 2/17/2011 1:23:35 PM
G7 and make sure you enter the G7 BC. Feom my understanding G1 was designed for handgun bullets and was the standard for years. G7 IS FOR RIFLE BULLETS
Here are the G7 BC's of the most common bullets we use in competition. Lapua 0.308" 155gr Scenar 0.236 Sierra 0.308" 155gr Palma 0.229 Hornady 0.308" 155gr Amax 0.212 Hornady 0.308" 168gr Amax 0.230 Sierra 0.308" 168gr Matchking 0.218 Nosler 0.308" 168gr Competition 0.218 Sierra 0.308" 175gr Matchking 0.243 Hornady 0.308" 178gr Amax 0.240 Sierra 0.308" 190gr Matchking 0.270 Hornady 0.308" 208gr Amax 0.324 Berger 0.284" 180gr VLD 0.337 Sierra 0.284" 175gr Matchking 0.327 Hornady 0.284" 162gr Amax 0.307 Sierra 0.264" 142gr Matchking 0.301 JLK 0.264" 140gr VLD 0.327 Berger 0.264" 140gr VLD 0.313 Hornady 0.264" 140gr Amax 0.299 Nosler 0.264" 140gr Competition 0.281 Lapua 0.264" 139gr Scenar 0.285 Berger 0.264" 130gr VLD 0.282 Sierra 0.264" 123gr Matchking 0.260 Berger 0.243" 115gr VLD 0.279 Tubb 0.243" 115gr Dtac 0.276 Sierra 0.243" 107gr Matchking Use 0.510 G1 bc Sierra 0.224" 69gr Matchking 0.169 Berger 0.224" 75gr VLD 0.217 Hornady 0.224" 75gr Amax 0.212 Sierra 0.224" 77gr Matchking 0.190 Berger 0.224" 80gr VLD 0.228 Sierra 0.224" 80gr Matchking 0.217 Berger 0.224" 90gr VLD 0.281 |
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Posted: 2/17/2011 1:29:58 PM
Sign up. The info that can be found our forum is priceless
The above is taken from this thread. Brian Litz of berger bullets is a genius!! http://caprc.com/forums/viewtopic.php?f=9&t=987 |
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Posted: 2/17/2011 1:49:25 PM
[Last Edit: 2/17/2011 1:56:36 PM by d_striker]
Originally Posted By 300BR:
I pay more attention to G1 vs. G7 after 1500 yds., but I shoot a fairly flat cartridge. If you 're shooting to the point where the two diverge, use the G7, otherwise don't sweat it. You should be confirming your ballistics card with range data anyway. John I'm shooting .308. The difference in drop is anywhere from 1"-4" depending on distance. What you say is true about confirming with range data, but the closer I can get my ballistic data to my actual range data from the start, the less work I have in the end. |
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Posted: 2/17/2011 1:49:55 PM
Originally Posted By Juice5610:
Sign up. The info that can be found our forum is priceless The above is taken from this thread. Brian Litz of berger bullets is a genius!! http://caprc.com/forums/viewtopic.php?f=9&t=987 Thanks... Will do. |
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Posted: 2/17/2011 2:15:37 PM
[Last Edit: 2/17/2011 2:16:14 PM by 300BR]
Originally Posted By d_striker:
Originally Posted By 300BR:
I pay more attention to G1 vs. G7 after 1500 yds., but I shoot a fairly flat cartridge. If you 're shooting to the point where the two diverge, use the G7, otherwise don't sweat it. You should be confirming your ballistics card with range data anyway. John I'm shooting .308. The difference in drop is anywhere from 1"-4" depending on distance. What you say is true about confirming with range data, but the closer I can get my ballistic data to my actual range data from the start, the less work I have in the end. I guess we think different... or you HAVE to make the first shot count with no field data. For most of my shooting if my first, unconfirmed with field data, shot is with in 1-4", I'm delighted. Bryan Litz's G7 #'s are built into the pull=down bullet menu on JBM, FWIW and have been very close out past 2000 yds. for me. John |
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Posted: 2/17/2011 3:52:38 PM
Originally Posted By 300BR:
Originally Posted By d_striker:
Originally Posted By 300BR:
I pay more attention to G1 vs. G7 after 1500 yds., but I shoot a fairly flat cartridge. If you 're shooting to the point where the two diverge, use the G7, otherwise don't sweat it. You should be confirming your ballistics card with range data anyway. John I'm shooting .308. The difference in drop is anywhere from 1"-4" depending on distance. What you say is true about confirming with range data, but the closer I can get my ballistic data to my actual range data from the start, the less work I have in the end. I guess we think different... or you HAVE to make the first shot count with no field data. For most of my shooting if my first, unconfirmed with field data, shot is with in 1-4", I'm delighted. Bryan Litz's G7 #'s are built into the pull=down bullet menu on JBM, FWIW and have been very close out past 2000 yds. for me. John He is using either shooter for the android or ballistics fte for the iphone not JBM. JBM is awesome though |
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Posted: 2/17/2011 5:42:05 PM
Originally Posted By d_striker:
Which model should I select for my ballistic calculator app? The difference in drop is pretty drastic between the two models. I use or plan on using the following bullets. They are all boat tails. 175 SMK 165/180 Sierra Gameking SBT 165/180 Nosler Accubond G7 results are valid over a wide margin of velocites, which mimics a bullets true path to the target. G1's drag model was for the old artillery shells, which used 'flat base' projecticles IIRC. G3 I want to say, is for more modern boat tail projectiles. G7 is the way to go if you have a G7 B.C. for a given projectile, to input. Bryan Litz has these listed in his book and if you glean the web, you can find out some of them without having to buy his book. Search SnipersHide. As an example, Hornady's 7mm 162gr AMAX is listed at a G3 of .625, but he's knocked it down to .599, so things vary. Chris |
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Posted: 2/17/2011 6:44:52 PM
Originally Posted By Juice5610:
He is using either shooter for the android or ballistics fte for the iphone not JBM. JBM is awesome though I have Ballistic FTE for iphone. |
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Posted: 2/19/2011 2:54:42 PM
[Last Edit: 2/19/2011 2:56:25 PM by ziebart]
I just got Ballistic FTE and used the G1 to get me on paper. When I got home I played with the numbers until I got something that matched up. G7 seems to match up the best. Still it is off at a 500 and 800 yards, but on at 600, 700 and 900, 1000. The bc numbers I ended up using were pretty far off from what I had got off the interwebs. It might be due to me not putting in the atmospheric conditions correctly. I can't seem to get the density altitude field to be in feet, it shows up in lb/ft3. I wish there was a manual, FAQ, or at least an explanation of terms like JBM uses.
I was using a 115 DTAC and published G7 is .276 I used .335. |
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Posted: 2/19/2011 3:04:03 PM
These are all correct
Here are the G7 BC's of the most common bullets we use in competition. Lapua 0.308" 155gr Scenar 0.236 Sierra 0.308" 155gr Palma 0.229 Hornady 0.308" 155gr Amax 0.212 Hornady 0.308" 168gr Amax 0.230 Sierra 0.308" 168gr Matchking 0.218 Nosler 0.308" 168gr Competition 0.218 Sierra 0.308" 175gr Matchking 0.243 Hornady 0.308" 178gr Amax 0.240 Sierra 0.308" 190gr Matchking 0.270 Hornady 0.308" 208gr Amax 0.324 Berger 0.284" 180gr VLD 0.337 Sierra 0.284" 175gr Matchking 0.327 Hornady 0.284" 162gr Amax 0.307 Sierra 0.264" 142gr Matchking 0.301 JLK 0.264" 140gr VLD 0.327 Berger 0.264" 140gr VLD 0.313 Hornady 0.264" 140gr Amax 0.299 Nosler 0.264" 140gr Competition 0.281 Lapua 0.264" 139gr Scenar 0.285 Berger 0.264" 130gr VLD 0.282 Sierra 0.264" 123gr Matchking 0.260 Berger 0.243" 115gr VLD 0.279 Tubb 0.243" 115gr Dtac 0.276 Sierra 0.243" 107gr Matchking Use 0.510 G1 bc Sierra 0.224" 69gr Matchking 0.169 Berger 0.224" 75gr VLD 0.217 Hornady 0.224" 75gr Amax 0.212 Sierra 0.224" 77gr Matchking 0.190 Berger 0.224" 80gr VLD 0.228 Sierra 0.224" 80gr Matchking 0.217 Berger 0.224" 90gr VLD 0.281 |
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Posted: 2/19/2011 7:57:32 PM
[Last Edit: 2/19/2011 7:58:30 PM by Eagle-ReaperDriver]
Not to be nit picky, but actually G5 BCs are best for the common boat tail bullets like 175 and 168 SMKs, etc. G7 is for the VLD bullets like the Lapua Scenars, Berger VLDs and the like.
Having said that, I use G7s exclusively for 175 SMK and they are way more accurate in my ballistic calculators than the G1s beyond about 500 yds. Under that, you'll see almost no difference. I've usually been within .1 to .2 mil at 1000 yds with G7s and correct data. But like anything, garbage in/garbage out. If the rest of your info like MV and atmospheric data sucks, your output will also suck. |
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LoneWolfUSMC
Member
Team Member
Joined: Sep 2004 IN, USA
Posts: 6333 Feedback: 100% (1) Link To This Post |
Posted: 2/20/2011 2:50:54 PM
Originally Posted By Juice5610:
He is using either shooter for the android or ballistics fte for the iphone not JBM. JBM is awesome though Ballistic FTE uses the JBM Ballistics engine unless you turn it off in settings. So in effect Ballistic is just the user interface for the JBM calculations. |
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Posted: 2/20/2011 3:23:01 PM
True but I've found shooter for the android to be far more accurate as far as first round hits go. Also the guy that designed it is on the hide. One of the shooters in the club I'm in contacted him and had him add a feature we needed/wanted. You cant beat that kind of service.
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