JLK 130 VLD G1 BC?
- Thread starter DJ111
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Bryan Litz Ballistics
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Dallas,
If the JLK 130 VLD has the same ogive and BT as the JLK 140, it will have essentially the same form factor. That means the BC will scale directly with weight. I measured the G1 BC of the 140 to be .639 (average from 3000 to 1500 fps). So the G1 BC of the 130 would be: .639*130/140 = .593 (averaged for the same speed range).
This is not a direct measurement, but it's the best guess I can make.
-Bryan
If the JLK 130 VLD has the same ogive and BT as the JLK 140, it will have essentially the same form factor. That means the BC will scale directly with weight. I measured the G1 BC of the 140 to be .639 (average from 3000 to 1500 fps). So the G1 BC of the 130 would be: .639*130/140 = .593 (averaged for the same speed range).
This is not a direct measurement, but it's the best guess I can make.
-Bryan
Bryan Litz Ballistics
Site $$ Sponsor
.476
Sisu said:
Bryan has already answered this! Read the second entry on this thread.
I shoot a 6.5x47 in f-class from 300-1200 yards , I have used mainly 130 bergers and did very well with them.shot over 10,000 of them. then I got 2000 130 jlk bullets they shot well, but did not out perform the bergers. then got some 129 matrix bullets and shot them "round robin" next to the jlk's at the exact same speed and there was no difference in elevation if any thing the matrix 129 bullets shot maybe an inch higher! I'm not convinced that the jlk bullets are the claimed b.c. that is listed on there web site. would i buy them again NOPE!. i think matrix is better for me.
I have not shot the 130 JLK's non-pointed so I dont know if this will help or not, but when I did use to shoot them I shot them pointed and used a G7 of .315 to get everything to match up with my velocity of 2910(chrono'd over a PVM and Oehler)(6.5x47). Using Bryan's quick conversion that would be a .615 G1.
Best Regards
Scott
Best Regards
Scott
Jake,
Sorry man, I dont know for sure. If my memory serves me correct, when I did my original load development it was with non-pointed bullets and I seem to remember using the 142mk profile in the program I use and it worked out pretty well. The program uses Litz's numbers, which I believe is .588 G1. That being said, I would not take this as rock solid info as I did not spend enough time with the non-pointed bullets to get solid data.
I am shooting in Sac,CA this weekend , but when I get back I will look and see if I have any notes on this.
I will say that most of the different JLK's I have played with seem to be worth the effort and time to point,IMO.
Regards
Scott
Sorry man, I dont know for sure. If my memory serves me correct, when I did my original load development it was with non-pointed bullets and I seem to remember using the 142mk profile in the program I use and it worked out pretty well. The program uses Litz's numbers, which I believe is .588 G1. That being said, I would not take this as rock solid info as I did not spend enough time with the non-pointed bullets to get solid data.
I am shooting in Sac,CA this weekend , but when I get back I will look and see if I have any notes on this.
I will say that most of the different JLK's I have played with seem to be worth the effort and time to point,IMO.
Regards
Scott
Cool Scott,
I have my 6.5x47 shooting the 130 JLK's and its been doing well. I have only shot two matches with it though.
First match was a PRS event and I got second to some bald guy, big white bald guy, I guess that describes both of us!! And then was fortunate enough to win the kettle falls steel challenge, But that is the only experience I have with the gun to be honest.
BUT, if I can keep another advantage by pointing the bullets I very well might do so.
My question is this---are they going to be more accurate because I do so?
I have my 6.5x47 shooting the 130 JLK's and its been doing well. I have only shot two matches with it though.
First match was a PRS event and I got second to some bald guy, big white bald guy, I guess that describes both of us!! And then was fortunate enough to win the kettle falls steel challenge, But that is the only experience I have with the gun to be honest.
BUT, if I can keep another advantage by pointing the bullets I very well might do so.
My question is this---are they going to be more accurate because I do so?
Ok guys enlighten me.
When pointing a bullet, do you actually take material off of the tip? Or just compress it down so its more pointed?
What system do you all use? I thinking of buying a pointer, just want a little more feedback. I want the best BC possible with the 130 JLK's. should I just point? Or point and then trimmer and square up everything?
When pointing a bullet, do you actually take material off of the tip? Or just compress it down so its more pointed?
What system do you all use? I thinking of buying a pointer, just want a little more feedback. I want the best BC possible with the 130 JLK's. should I just point? Or point and then trimmer and square up everything?
Just pointing them will probably help a little with vertical dispersion at the longer distances, but to really get the best out of pointing/tipping, I personally highly recommend trimming first as this will make your bullets about consistent as an end user can get them. It definitely will help tighten up vertical.
Another problem with tipping if you dont trim will be that you stand the chance of deforming some of your bullets or under tipping others. Just as an example- Say your lot of bullets vary .015" in oal (which unfortunately is not all that uncommon), well if you set your tipping die up with the shortest of the bullets you can very easily cause some deformation on the longest bullets. Vice versa- if you set up with the longest bullet you may not tip the short bullets enough to keep them consistent with the longer ones, which IMO negates the whole purpose.
Anyhow, hope that makes sense.
One other thing, if you are going to start trimming and pointing, a giraud trimmer with meplat insert is a must as it makes trimming a very,very fast process.
BTW, it was good to meet and shoot with you in Washington earlier this year.
Scott
Another problem with tipping if you dont trim will be that you stand the chance of deforming some of your bullets or under tipping others. Just as an example- Say your lot of bullets vary .015" in oal (which unfortunately is not all that uncommon), well if you set your tipping die up with the shortest of the bullets you can very easily cause some deformation on the longest bullets. Vice versa- if you set up with the longest bullet you may not tip the short bullets enough to keep them consistent with the longer ones, which IMO negates the whole purpose.
Anyhow, hope that makes sense.
One other thing, if you are going to start trimming and pointing, a giraud trimmer with meplat insert is a must as it makes trimming a very,very fast process.
BTW, it was good to meet and shoot with you in Washington earlier this year.
Scott
Heck yeah Scott, good to shoot with you as well! I'm sure we will see each other again on the podium at the next match. (-:
Your one heck of a shot.
I am now leaning towards leaving my bullets how they are!! LOL, shut I don't know. I want them more consistent and to have a higher BC but at what cost both time and money wise. Makes for a tough decision.
Your one heck of a shot.
I am now leaning towards leaving my bullets how they are!! LOL, shut I don't know. I want them more consistent and to have a higher BC but at what cost both time and money wise. Makes for a tough decision.
Hi Gents,
I had very good results at our 600yrd matches last year using the 130 jlk bullets in my 6.5x47,,,
This year i also used the same rifle in the 100 yrd class with the 130 jlk bullets and managed to get four small group patches, also it is looking like i might have second place in the championships,,,
Good results to be sure,,,
The bc that i have been using was 595
Load, 38.3 of varget
fps 2914
Looking at the lovely shape of these bullets and the results that i have had with them in the last few months,
i would not go to the trouble of pointing???, just my two cents worth,,,,
Darrel
I had very good results at our 600yrd matches last year using the 130 jlk bullets in my 6.5x47,,,
This year i also used the same rifle in the 100 yrd class with the 130 jlk bullets and managed to get four small group patches, also it is looking like i might have second place in the championships,,,
Good results to be sure,,,
The bc that i have been using was 595
Load, 38.3 of varget
fps 2914
Looking at the lovely shape of these bullets and the results that i have had with them in the last few months,
i would not go to the trouble of pointing???, just my two cents worth,,,,
Darrel
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