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#6792637 - 06/13/17 09:49 PM Doing some load Dev for my 260 Rem
Kevin1 Online   content
Bird Dog

Registered: 04/06/11
Posts: 414
Loc: Allen Tx
This is my first outing with the 260 and I thought Id share my results. Im pretty happy as the worse load is still producing sub 3/4MOA accuracy.

Rifle: AIAT
Barrel: Bartlein blank, 26 long, work done by Mile High Shooting, little bastard gen2 break
Scope: Kahles Gen3 6-24

Load:
IMR 4451 from 39.3 to 42 gr
Lapua new brass
CCI BR2
147 gr ELD M seated with a 0.015 jump and an OAL of 2.870

Target shot at 100Y, Robin style.



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#6792647 - 06/13/17 09:56 PM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
SapperTitan Online   content
Taking Requests

Registered: 11/17/10
Posts: 19770
Loc: Killeen/Ft Hood, TX
I think your 40.8 is a winner
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#6792650 - 06/13/17 09:57 PM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 20084
Loc: Wolfe City, TX
Very nice.

40.8 gr looks good. I also look at the charges before and after, and they look pretty good as well.
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#6793117 - 06/14/17 10:43 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
Weegs Offline
Bird Dog

Registered: 07/27/13
Posts: 389
Loc: Round Rock
Target shot at 100Y, Robin style.

I understand 100y, What is Robin style?

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#6793130 - 06/14/17 10:55 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 21282
Loc: Texas
Looking good, Might want to stretch it out a bit more but 40.8 looks real good.

All groups are sub MOA which speaks well for rifle and shooter.
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#6793138 - 06/14/17 10:59 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
Kevin1 Online   content
Bird Dog

Registered: 04/06/11
Posts: 414
Loc: Allen Tx
This is an OCW load dev test.

Robin style (round-robin), is when you don't shoot all the 3 bullets in a given load, one after the other.
In the above target, I shot 1 round with 39.3g, then one round with 39.6g, etc....the second round shot with 39.3gr was after shooting the first round of the 42gr load.

You can do some more reading on this here:

http://www.6mmbr.com/laddertest.html

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#6793143 - 06/14/17 11:04 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
Weegs Offline
Bird Dog

Registered: 07/27/13
Posts: 389
Loc: Round Rock
Kevin1, thanks.

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#6793175 - 06/14/17 11:30 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
jeffbird Online   content


Registered: 03/09/09
Posts: 1996
Would suggest moving back to 200 or 300 yards and the results will be obvious.

Also, a good load at 100 yards may not be good at 200 or 300.

Pick the best at that distance and then test out as far as it will be used.

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#6793307 - 06/14/17 01:17 PM Re: Doing some load Dev for my 260 Rem [Re: jeffbird]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 20084
Loc: Wolfe City, TX
Originally Posted By: jeffbird
Would suggest moving back to 200 or 300 yards and the results will be obvious.

Also, a good load at 100 yards may not be good at 200 or 300.

Pick the best at that distance and then test out as far as it will be used.


I agree. I was testing some tweaking powder charges for my 7mm-08 yesterday. It was windy, so I merely shot 3 round groups at 100 yards, just to get a bead on things. Out of 5 charges, two got thrown out. But the good ones measured .50", .80", and .55". I'll go back and re-shoot those at 200 or 300 yards, for 5 shot groups.
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#6793347 - 06/14/17 01:44 PM Re: Doing some load Dev for my 260 Rem [Re: FiremanJG]
Kevin1 Online   content
Bird Dog

Registered: 04/06/11
Posts: 414
Loc: Allen Tx
Yes, yesterday was pretty windy.

But guys, this is an OCW test. It's not meant to test the accuracy of the load. It's to identify a load charge that will minimize the vertical dispersion in warmer/colder weather. That's a huge deal for long range. After that, you can play with the seating depth to increase your accuracy.

From that aspect, that 40.8gr looks good, but so does the 41.7gr charge.

Below the vertical variation of the point of impact in reference to the point of aim.



Gr ------ Vertical
39.3 ------ 1.68
39.6 ------ 1.42
39.9 ------ 1.7
40.2 ------ 1.41
40.5 ------ 1.47
40.8 ------ 1.38
41.1 ------ 1.09
41.4 ------ 1.14
41.7 ------ 0.89
42 ------- 0.83


Edited by Kevin1 (06/14/17 01:47 PM)

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#6793379 - 06/14/17 02:08 PM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
ChadTRG42 Online   happy
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Registered: 09/16/09
Posts: 10495
Loc: Lewisville, TX
But, OCW does not tell you anything at 100 yards. That's why it's done at 500+ yards. The 40.8 does look good, but it will be slow for a 260 Rem. Any chronograph data?

Also, why does the vertical variation of the point of impact in reference to the point of aim matter? As your powder charge goes up, so does your speed, and the group impacts higher on the target.

If I'm trying to find a long range load, I'm testing at minimum 200 yards, and prefer 300 on a calm day.

So, you have fired 30 shots for testing. What did this tell you? And what's your next step(s)? I'm just trying to get an idea on your process.
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#6793799 - 06/14/17 09:37 PM Re: Doing some load Dev for my 260 Rem [Re: ChadTRG42]
Kevin1 Online   content
Bird Dog

Registered: 04/06/11
Posts: 414
Loc: Allen Tx
Originally Posted By: ChadTRG42
But, OCW does not tell you anything at 100 yards. That's why it's done at 500+ yards. The 40.8 does look good, but it will be slow for a 260 Rem. Any chronograph data?

Also, why does the vertical variation of the point of impact in reference to the point of aim matter? As your powder charge goes up, so does your speed, and the group impacts higher on the target.

If I'm trying to find a long range load, I'm testing at minimum 200 yards, and prefer 300 on a calm day.

So, you have fired 30 shots for testing. What did this tell you? And what's your next step(s)? I'm just trying to get an idea on your process.




You're mixing up ladder test (done at longer range) and OCW (done at 100Y).

Next step? Load up some rounds with 41.8 gr of powder, do some chrono measures, and hit steel from 900Y to 1100Y.

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#6794060 - 06/15/17 08:54 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
Sigmund Offline
Green Horn

Registered: 12/15/15
Posts: 8
I am far from an expert on this subject, the below is just my understanding of the procedure I reference below. I'm interested in hearing what some of the more experienced people here have to say about it.

I tried using this OCW process using the instructions I found here: http://www.ocwreloading.com/about.html to develop a load for a 6.5 creedmoor and a 30-06.

It got my interest based on the following claims:
- Determine OCW with minimal number of rounds
- Improved (less) temperature sensitivity
- 100y shooting range (10 minutes away)

So after reading the manual several times, I decided to "trust the process", load some ammo and go to the range. I did the 6.5 creedmoor first, 129 nosler ABLR, H4350. After the first trip to the range, I came home with a pattern of targets that looked similar to yours. My conclusion was that I didn't go to a high enough charge weight (I don't know what the max is for your powder/bullet combo). So, I loaded a whole new batch up to a higher charge weight and went back to the range. After shooting, the results looked more complete, and chose what appeared to be the OCW according to the process, and then started to adjust seating depth using the charge weight I had identified.

Getting the right seating depth took a while, but I was finally able to make 3 holes touch on rounds 96, 97, and 98... (fired round robin)

I wasn't impressed with how many rounds it took, but part of that can surely be contributed to my lack of experience...
As for the temperature stability claims, I loaded these in Feb, and still have about 40 rounds to try out this summer. We will see...
Going to longer range, I have a 16" plate at the deer lease that I was able hit 3/3 at 600y (~2.7 MOA) I know that's not outstanding proof, but ya gotta work with what you got sometimes...

After going thru the same process for the 30-06. I came to the conclusion that I need to order some Lapua brass... and/or get an annealing machine, the brass was work hardening fast, believe it was giving me neck tension problems.

That being said, if I were to "trust the process" with the data you've given, it looks like either 40.5, 42. Not sure what the max is, but it would be interesting to see where 42.3 would end up?

I like charts, so I plotted the data you provided, so it's easier (for me at least) to see where the "flat" spots are.

Like I said at the beginning, I am not an expert at this, and this was just my interpretation of "the process" I would like to hear from others here if there is any merit to this process? Or was I just drinking the cool-aid?


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#6794081 - 06/15/17 09:15 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
P_102 Offline
Tracker

Registered: 09/23/08
Posts: 721
Loc: Grapevine
I guess I'm confused about OCW... If it is meant to find the load that will "minimize the vertical dispersion in warmer/colder weather", wouldn't you have to shoot in both warmer and colder weather? P_102
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#6794084 - 06/15/17 09:16 AM Re: Doing some load Dev for my 260 Rem [Re: Kevin1]
Gwood88 Offline
Bird Dog

Registered: 10/25/13
Posts: 370
Originally Posted By: Kevin1
Originally Posted By: ChadTRG42
But, OCW does not tell you anything at 100 yards. That's why it's done at 500+ yards. The 40.8 does look good, but it will be slow for a 260 Rem. Any chronograph data?

Also, why does the vertical variation of the point of impact in reference to the point of aim matter? As your powder charge goes up, so does your speed, and the group impacts higher on the target.

If I'm trying to find a long range load, I'm testing at minimum 200 yards, and prefer 300 on a calm day.

So, you have fired 30 shots for testing. What did this tell you? And what's your next step(s)? I'm just trying to get an idea on your process.




You're mixing up ladder test (done at longer range) and OCW (done at 100Y).


Oh no you didn't. popcorn
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