Browninglover1
Well-Known Member
I find it interesting that G7 B.C's appear to get higher as the velocity decreases which is the opposite of what happens with G1 B.C's.
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Test results on 264 cal 150 & 160 gr Matrix Bullets
- Thread starter BryanLitz
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elkaholic
Well-Known Member
I too found that interesting! I may be moving to your area if you are near Logan........Rich
Browninglover1
Well-Known Member
Bryan,
Does your book explain why the G7 BC increases with slower velocities?
Does your book explain why the G7 BC increases with slower velocities?
Yes. Applied Ballistics for Long Range Shooting has the most thorough explanation.
To sum it up; it only has to do with how the G1 and G7 standards compare to a certain bullet.
BC's going up or down at long range is just a comparison with how a bullets drag compares to the G1 or G7 standard. The bullet flight isn't affected, just how the model compares.
And a word about Matrix, I want to make sure that none of my comments are seen as negative against Matrix bullets. For a long time, Marshal has been open to outside analysis and has done his best to represent the performance of his bullets accurately. He recently sent me another batch of bullets to test and I plan to do so and share the results.
-Bryan
cummins cowboy
Well-Known Member
- Joined
- Nov 21, 2010
- Messages
- 361
bryan, I have been reading your articles on your website and studying your stuff. I love your info that you have out there. I have your videos and your phone app. I love the calibration feature based on observed shooting.
I was wondering if you tested the 150 .277 accubond long range bullet yet. do have a guess on what the real numbers for this bullet are.
I was wondering if you tested the 150 .277 accubond long range bullet yet. do have a guess on what the real numbers for this bullet are.
Thanks for the complements. It's good to hear when people are using our stuff and it's working for them.
I have tested the whole line of Nosler LR Accubonds and posted results on this thread:
http://www.longrangehunting.com/forums/f19/nosler-lr-accubonds-bc-testing-results-137554/
Take care,
-Bryan
Thanks Bryan.
I like the format!
I like the format!
BrentM
Well-Known Member
Curios Bryan, I really like the format which spells out stepped BC for given velocity. I have had discussions with some people who claim to be experts and quote you often about stepped BC formats for ballistics apps. They seem to think stepped BC for Bergers is bogus. I have both Matrix and Bergers in the 6.5 I use for my predator rifles and have played with my own trial and error stepped BC for the berger 140. Do you feel this format is the best method for that bullet as well?
BrentM
Well-Known Member
Does anyone else have an opinion on this? I have not done a lot of ELR shooting but it seems when I get past 1000 I need to tweak things a bit.
Alan Griffith
Well-Known Member
Any test results on the 6.5mm Matrix 142 VLD?
Alan
Alan
Outlaw6.0
Well-Known Member
Gotta tag in here, I can't believe I missed this thread by 21 days! Thank you Bryan, I do appreciate the evaluation.
I like the format of the data sheets; simple to understand, just the way I like it
t
I like the format of the data sheets; simple to understand, just the way I like it
t
87predator
Well-Known Member
Tag
Outlaw6.0
Well-Known Member
So, I have to admit that I have next to zero experience running the G7 BC's. After Bryan posted his findings, I started toying with my original data running a straight up G1 of .680 @ 3100fps. I compared that with the stepped G7 straight from Bryan's chart.
Pressure is Absolute
Baro of 25.95
Temp 70*
1000 Yds
G1= 20.76 IPHY
G7= 21.06 IPHY
Ok just over 1/4 min difference, not bad.
1325 Yds
G1= 33.90 IPHY
G7= 33.33 iPHY
Now it's just over 1/2 min the other way around? (scratches head)
I see that the stepped G7 actually increase BC as the velocity goes down. I'm just surprised to see the flip flop with the same bullet going the same speed in the same conditions. I guess the right thing to do is shoot at those distances & see which is the better choice. gun)
To those of you have more experience with G7; what do you think? Maybe I should use his data to step the G1 as well.....
t
Pressure is Absolute
Baro of 25.95
Temp 70*
1000 Yds
G1= 20.76 IPHY
G7= 21.06 IPHY
Ok just over 1/4 min difference, not bad.
1325 Yds
G1= 33.90 IPHY
G7= 33.33 iPHY
Now it's just over 1/2 min the other way around? (scratches head)
I see that the stepped G7 actually increase BC as the velocity goes down. I'm just surprised to see the flip flop with the same bullet going the same speed in the same conditions. I guess the right thing to do is shoot at those distances & see which is the better choice. gun)
To those of you have more experience with G7; what do you think? Maybe I should use his data to step the G1 as well.....
t
elkaholic
Well-Known Member
I would use the G7 as the error gets worse on the high b.c. bullets the farther you go with the G1. At closer ranges, 1/2 moa doesn't matter much anyway.......Rich
