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Extreme Long Range Hunting & Shooting (ELR) Over 1,000 Yds.


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2224 Yards with the LRKM

 
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  #1  
Old 05-05-2012, 10:41 AM
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2224 Yards with the LRKM

A friend and I went to scout a hunting spot and test the LRKM for an upcoming rifle match at the NRA Wittington Center that will have targets from 600-2200 yards. I started at 856 yards and predictably was on the money. I was using the G1 bc's I developed for the 300 gr Berger Gen 2 out of my standard Canyon Rifle @ 2862 fps. I was sure that despite the fact that the LRKM was spitting them out at 3137 fps that all of the 3 digit shooting would probably be the same so far as BC's were concerned. The next shots I shot were at 1408 yards and again first shot hits even though I had predicted and dialed in 3.5 moa of wind. My group size at this distance for 3 rounds was about 10-12 inches using the reticule to measure.
Our next target (rock) was at 2224 yards, have I mentioned I love my Vectronix? I ran the numbers / conditions and got 70.25 moa for elevation and 8.25 moa for a full 10 mph wind. Our target rock was large 2 moa square (4'x4' roughly) I looked at the wind gave it my best educated guess and called it 8 mph and half value, I dialed in 3.50 moa right. I stood from the rifle and looked at my hunting partner and said why don't you take the first shot? He had never shot past 1000 and was all too eager to try. He got behind my lefthanded LRKM despite being RH and settled in. I took a last look at the wind and we he was set told him to send it. At the crack of the rifle I watched the rock yawned, took a bite of my sandwich and almost 4 seconds later watched the bullet impact the rock, center for wind and about 1 moa low, not a bad first attempt for over 2K. I got behind the rifle and shot 3 shots the first being level for elevation and 8" right, the second was 8" right and 4" low, the third was 6" left and about 4" high. All in all I was impressed with the performance of the rifle to shoot a group of roughly 3/4 moa at over 2200 yards.
There are some interesting observations in this kind of shooting:

1. a hit of 6-8" off center is still in the group size of a perfectly centered group.

2. every 1 mph of wind is roughly 18-19" of wind drift, so looking at my group that was very wide compared to the verticle is it capable of groups that are 8-10" at that distance assuming that the wind changes were resonsible for the remainder of the lateral group size? Or are groups shaped like that just part of the nature of spinnig projectiles and extreame distances?

3. I was lucky to nail the wind just right on the first shot, I mean really can you tell the difference of 7 mph or 8 mph across a canyon over 2200 yards? Even looking at the difference of the wind coming from 40 degrees or 60 degrees makes alot of difference. At these distances you just cannot mess around with not being exact when it comes to the winds effects.

4. Even though the BC's developed for the std 338 Edge were at 2860 fps or so jumping the velocity to 3137 had no apparent effect on trajectory so far as BC was concerned.

5. It is tough but what a good time.

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  #2  
Old 05-05-2012, 11:00 AM
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Re: 2224 Yards with the LRKM

Shawn, you realize the world is watching ...
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Old 05-05-2012, 12:13 PM
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Re: 2224 Yards with the LRKM

Totally amazing results Shawn. Congrats to you and your friend for some great shooting and to you for creating one hell of a rifle.

So what did you calculate the impact velocity to be? I would assume the 300 Berger had gone through subsonic transition or if not was gong through it?

Sounds like some real fun to me.

Thanks for sharing.

Jeff
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Old 05-05-2012, 01:58 PM
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Re: 2224 Yards with the LRKM

Good shooting!

What did you calculate the BC to be?
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Old 05-05-2012, 03:08 PM
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Re: 2224 Yards with the LRKM

Broz,

The impact velocity was still 1178 fps (according to the program) and subsonic happens right at 2500 yards. Of course you already know how the Berger handles reentry so to speak. I hope to be able to do some testing at 2500-3000 yards in near future. Based on what we saw last summer testing at 2568 I have high hopes for this setup at those distances.

We have been using the following G1 BC's for quite sometime on the Exbal program.

.818 lower limit 2200 fps
.760 lower limit 1700 fps
.680 lower limit 0 fps

Some may not agree with them but we have used them in 3 rifles with muzzle velocities from 2600-3137 fps and they have worked very well for us.

Len,

I hope that there are a few people watching, I know a group of guys that are quite interested in this round, bullet and platform.
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Old 05-05-2012, 05:03 PM
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Re: 2224 Yards with the LRKM

Holy cow, super sonic to 2500 yards. Darn you, you are going to make me buy one of these aren't you.. I gotta get over and get a field demonstration first though..

Yes when we tested the 300's going subsonic it really didnt have much of an ill effect. Nothing like the SMK's do anyway.

Shawn, those BC number are along the same lines as I worked out with my rifle too. Just a little spot where I had to come back up but I used 5 stepps so we are close. It is nice of you to share those numbers. I know how much work and time it takes to get them.

Thanks!

Jeff
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Old 05-06-2012, 01:51 AM
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Re: 2224 Yards with the LRKM

Thanks for the write up on the new toy very impressive.
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