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Rifles, Bullets, Barrels & Ballistics Applied Ballistics



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Unread 05-01-2009, 05:55 PM
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Join Date: Jun 2007
Location: Central Washington
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Originally Posted by MontanaRifleman View Post
Thanks Bill, When crunching the numbers I find the the difference in drop to be about 3" @ 700 yds with the advertized BCs. The JLK (with advrtized BC) will get about 100 yds farther down range than the Berger @ 1800 fps.

Keep us posted,

I'm not sure that there is any real world difference in the BC's, and Bryan points out that the group of JLK's he tested had a slightly larger Meplat than the Bergers he tested. The meplat on the JLK's I have are also ever so slightly larger than the Bergers I have. (It's minimal, but enough that I can tell them apart when 5 are loaded and placed beside 5 loaded Bergers.)

I don't have a pointing tool, (guess that goes on the next order from whereever!). I suspect that if the Meplats were the same, your couldn't tell them apart.

JLK runs their bullets in batches, as does Berger, so it would be nice if they could get on opposite schedules so we would have one or the other all the time!!

I think they both are premium bullets with great long range effectiveness for paper punching.

I haven't heard of anyone hunting with the JLK's, and I don't hunt anything but coyotes, so I'm not a good one to comment on that aspect.


The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.

Thomas Jefferson

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Unread 05-01-2009, 07:10 PM
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Join Date: Sep 2002
Location: Illinois
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Have shot JLKs for years in 30 cal, 190s in 3006 and 210s in 300 um. The bullets were different when Jimmy Knox made them, but the new ones are ok too. There are other custom makers that make good bullets too. You might try some Knight, Clinch River or BIBs.
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Unread 05-01-2009, 07:24 PM
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Location: Wilmington NC
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BIBs are great bullets, however they are a long long FB bullet that needs special throating for the bullet base to seat in the neck. Randy Robinett just announced a new short BT 108 gr 6mm that should work. It is simple for the smith to use a hand reamer from PTG to lengthen the throat.

Clinch River- Greg Seigmund is hard to get in touch with now and as he has a fulltime job last I knew he was not taking on any new customers. Great bullets IF you can get on his list.

Swampy who now has JLK, is using the same dies that Jimmy used except for the standard 210 JLK, but from same die maker. So they are super close to the original die as possible.

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Unread 05-01-2009, 07:28 PM
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Join Date: Apr 2002
Location: Montana
Posts: 259

I have shot two deer with the .30cal 190 JLK's. Both deer were 650 yards and the bullets passed though leaving 1-2inch exit holes. I also shot a deer at 650 with the 190 SMK and it may have made a slightly bigger exit hole, but not by much. I found the advertised BC to line up pretty close to real world results.
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Unread 05-02-2009, 12:41 AM
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Location: South of Canada and North of Wyoming
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Thanks for all the input guys. I do plan on trying some other bullets also but was just wondering how the JLK advertized BC stacked up.

Thanks again,

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Unread 05-02-2009, 12:47 AM
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Join Date: May 2008
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Originally Posted by bsl135 View Post
Jmason (and others)
Regarding the JLK BC's, I haven't tested the .30 cals, so I won't comment on those, but I have tested the 7mm 180 VLD's from both Berger and JLK. There's a short write up in 6mmbr.com's articles archive. I can't get a link directly to the article, but if you go here:

AccurateShooter.com Daily Bulletin

And type JLK into the search box on the right, it will bring up the analysis including dimensioned drawings of both the Berger and JLK.

Bottom line is the bullets (JLK and Berger VLD's) which are the same caliber, weight, and shape, not surprisingly have very similar BC's.

Thanks for dropping in Byan, and a good article too. It did seem strange to me that 2 bullets that were so close in design shoud have that much difference in BC, which is why I asked the question. Maybe one is consrvative or the other liberal with their estimation

Question for you... How well would shooting through 2 chronies work for getting an accurate BC? Say one at muzzle and another at 300 yds?
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Unread 05-02-2009, 07:18 AM
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Question for you... How well would shooting through 2 chronies work for getting an accurate BC? Say one at muzzle and another at 300 yds?
In theory this can go very good, in practice, it can go very bad!

The first step would be to set the chrony's up right against each other and shoot thru them to insure they're both reading the same velocity (or the expected 2-3 fps difference). This is key.
Next, make sure you have the accuracy to thread the needle before you try shooting thru the chrono at 300 yards.
Be sure you measure the atmospherics (air temperature, pressure and humidity).
It's very important that you measure the exact distance between the chrony's; with as little uncertainty as possible (+/- 1 foot is pretty good).
After you've collected the data, you can go to:
JBM - Calculations - Ballistic Coefficient (Velocity)
and plug it in. This will result in a very accurate BC that's corrected for standard atmospheric conditions. The BC will be the average value over 300 yards.
If you're ambitious enough, you can set the downrange chronograph at 100, 200, and 300 yards to get an idea of how much the BC changes with velocity. Another way would be to load your ammo fast and slow and shoot the same distance. This will make it harder to thread the needle.

Here's a link to an article I wrote about measuring BC's with the two chrno method. The article focuses on dispelling the worry that excessive pitching/yawing motion could affect the measured BC over short distance.

I hope you decide to take this on and share your experiences. Please be careful with that downrange chrono!

Take care,
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