260 Loads Only

[dar1246]

Re: 260 Loads Only

123 lapuas <span style="color: #FF0000">moly</span>
Nos brass
Fed GM210 prs
H4350 47.4grs
COAL 2.850
This is a 5 shots over the chrono. At 800 yards 2" vertical string in group.
<span style="color: #FF0000">Hot load. Work with caution on this load.Do not start at this level. Work up to a safe load for your gun. Each gun is different.</span>

High 2978
Low 2966
E.S. 12
Avg. 2972
S.D. 5.5
95% +/- 7.6

 

[downhill]

Re: 260 Loads Only

Broughton 8twist 26"long
140 AMAX
38g Varget
WLR primer
.015 jump
2745 fps
sub .5 moa @200yds
mild pressure signs

 

[gm9658]

Re: 260 Loads Only

Any one else using Varget?

 

[grmroper001]

Re: 260 Loads Only

FL Rem brass
CCI BR
39.1 varget
123 smk
2910-2920
26" 1-8 shilen

 

[downhill]

Re: 260 Loads Only

As far as using Varget, Sherri Gallagher just won the 2010 National High Power Championship.
Rem brass
Fed 210m primer
SMK 142's
Varget powder
2750 fps

 

[poison123]

Re: 260 Loads Only

Rem 7mm-08 necked to .260
Fed 210
139 Scenar @ 2.894
H4350 42.9gr
2867 fps

Out of a Broughton 5c 26"
No pressure signs. Going to see if I can push it to 2900

 

[Tangodown911]

Re: 260 Loads Only

24" 4 groove Krieger 8.5"tw (Gradous built)
Norma brass 1x-4x neck sized

H4831SC
45.5g
Berger 140 BTLRs
2.880 coal
66 degrees
2686 fps. ES of 4
Does mid .2"s

H4350
43.0g
142SMK
2.810 coal
82 degrees
2820fps ES of 9
High .2"s

All testing done as five shot groups off of a bipod on a bench with a rear sand bag.

 

[jgobbels]

Re: 260 Loads Only

GAP .260 20"
1-8.5 Twist
54*

Laupa 139gr
42.0gr R17
Nosler Brass
CCI BR2
.010 off the lands
Avg FPS - 2750
.210" at 100 Yards 5-Shot


Laupa 139gr
42.0gr H4350
Nosler Brass
CCI BR2
.005 off the lands
Avg fps - 2590
.230" at 100 yards 5-Shot

 

[Tangodown911]

Re: 260 Loads Only

My go to load is now 42.2 grains of H4350 with a Berger 140BTLR at 2.875-2.877 coal in Norma brass - BR2 primer pushing a comfortable 2765fps with an SD of 4. Best 5 shot group to date is .122"

The #130 is my seater # setting on my Redding die FYI....

 

[Red Ryder]

Re: 260 Loads Only

Do you also measure off the ogive TangoDown? Very impressive shooting.

 

[Tangodown911]

Re: 260 Loads Only

No I wish I had the tools to do so. Sometimes I feel like I'm stuck in the stone age compared to some or the other guys that post here.

 

[Lance B]

Re: 260 Loads Only

Good Morning and happy holidays. Can some one tell me if the twist rate of a 260 barrel (8-8.5-9.) has anything to do with the velocity of the bullet holding every thing else constant.

 

[k2peaker]

Re: 260 Loads Only

Interesting question -- you might want to post it to the general Reloading thread that probably gets more (seasoned) eyes than this one. Maybe Chad or GregL. will weigh in here.

Some folks have probably studied it, measured it, published it, etc. and will hopefully chime in.
My guess: between 1in8", 1in8.5", 1in9" -- rotational rates aren't marginally decreasing much (respectively). While I would expect some velocity decrease as the rotational rate increases, the question is how much? My hunch is it's extremely negligible, i.e., less of a variable than marginal differences in barrel length.

 

[Tangodown911]

Re: 260 Loads Only

The slower twist rates will typically produce a faster bullet...how much? I am not certain.

 

[dar1246]

Re: 260 Loads Only

I have 5 260s. From my experience the 8.5 twist has a little faster speed. Each tube will be a little different in speeds. Even if you pick a 8.5 twist over an 8 twist. The tube will vary from barrel to barrel but will be close. I have better luck achieving my desire speed with a 8.5 twist.

 

[HSNARC]

Re: 260 Loads Only

Heres one i worked up this past weekend


Virgin Win 7mm-08 brass necked down .289 neck bushing. trimmed chamfered and flash holes duburred
123g A-MAX
42.0g of H4350
Fed 210
About .025 off the lands Coal approx 2.820
Didnt chrono because it was getting dark but 42.5g in the same setup yeilded 2850fps and gave me a 2in group at 300yds, I am assuming this load is somewhere between 2800-2820fps i shot a 1.150 edge to edge 4 shot group with one called flyer about 1.5 inches away. Even with the flyer the group was still sub moa at 300 yards

For some reason this rifle likes slower velocities, recoil with this load is almost nonexistent. Enjoy!

 

[Unknown]

Re: 260 Loads Only

Because I'm expecting to receive my 260 build back this coming week, I have been looking at all the load data I can find for the 260 Remington and 142, 144, 139 grain bullets. The consensus seems to be that H4350 is the most frequently used powder to get good results, primers, brass don't seem to have as much of a consistency. The most accurate loads posted use charges varying from 41 to 44 grains of powder.

What I'm curious about is that Hodgdon's web site shows H4350 charges starting at 34 grains, and going up to 36.2 grains giving a pressure of around 58K with the 140 grain Sierra bullet.

Those loads noted in paragraph #1 START at nearly 5 grains over the manufacturer's recommended loading maximum, and the pressure of the max load on Hodgdon's chart isn't too wimpy at 58,000. What am I missing? Is the manufacturer's load data old, too conservative because of our litigious society, or is everyone just running higher pressures?

I don't want to blow up a nice new rifle, but I would like to get the most performance out of it that is REASONABLY possible. What is going on with the inconsistency between the recommend max load, and the loads that most folks seem to find work best?

 

[AKAce]

Re: 260 Loads Only

Not sure what you clicked wrong, but for 140's and H4350 Hodgdons sight says:

140 GR. H4350 .264" 2.780" 39.0 2530 51,900 PSI 42.0 2677 58,800 PSI

My Load is 43.6 of H4350, 140 A-Max and 2.865 OAL .085 Longer than their Test load ... So more case Capacity / less pressure.

Of Course, <span style="font-weight: bold">WORK UP</span>... Every rifle is dif

Then look at the 142's ....
142 GR. SIE HPBT H4350 .264" 2.780" 41.5 2590 50,100 PSI 44.5 2735 58,000 PSI

 

[Unknown]

Re: 260 Loads Only

Thanks so much! I'll take another look. I could figure out how everyone was getting so much more powder in the case. The vast majority of people on this site are pretty squared away, and no more keen to blow their rifle up than I am. I knew it had to be something.

I'll take another look.

 

[Unknown]

Re: 260 Loads Only

I'm so glad I asked, even though I do feel a bit stupid. I would rather feel stupid than blown up though.. I have always used IMR powders, and was looking for the H before the powder number, and had the 4895 line, rather than the 4350. I use IMR4350 in my Mcmillan M40A1 300 Win mag, so I think I focused in on the H and then four numbers...Sorry everyone, but thanks again for clarifying it..

My new build has a Defiance Machine Defender action, Manners stock, Badger M5 bottom metal, RWS muzzle brake, Rad Tac Latch mag release, Obermeyer 27 inch 5R barrel, Rifle basix trigger. Leupold Mk4 scope in either 4.5-14x50, 6.5-20x50, or 8.5-25x50 (I haven't decided which one to use yet). It is due back from the gunsmith this week, then off to be Cerakoted. I'm hoping to have it ready for a match on 12 February.

Any recommendations on which scope to go with which rifle would be appreciated.
There are three rifles: 1: Mcmillan M40A1 in 300 win mag, 2: Sako TRG22 in 308, 3:the new 260 Remington

How would you arrange the scopes, and why? (They are what I have in stock, and I'm just not rich enough to buy another scope or rifle right now.)

 

[k2peaker]

Re: 260 Loads Only

Scope question -- purely subjective of course.

Simply based upon greatest mag range for the usable rifle/caliber range:
.300 WinMag -- 8.5-25
.260 -- 6.5-20
.308 -- 4.5-14

The .260 and .308 overlap usable range considerably. As this is a .260 thread, we all probably have a big .260 bias. I believe that once you start shooting your .260 and gain the ballistic advantages (with lower recoil) that you'll naturally migrate to using your .260 more (although the TRG22s are nice).

 

[CPRifle]

Re: 260 Loads Only

Thought I'd share my load data.

Rifle: DPMS LR-260, 24", 1:8.5"
Load: 142 SMK, 39.0gr H-4350, CCI BR-2's, Necked down and preped LC Nato (7.62x51) brass, loaded to Pmag length ~2.800
Results: Consistently shoots 1/2 MOA to 600 yards. Average velocity of 2600fps, SD of 6fps.

Note: The case capacity is less than remington brass by approximately 2%.

 

[k2peaker]

Re: 260 Loads Only

Working up a gas gun load in .260 as well.

Platform: JP LRP in .260, 22", 1:8", Pmags
Load: Lapua Scenar 139gr., 42.6gr H4350, Win .243 necked up, turned, CCI BR2
OAL: max Pmag length

Chrono'ng at altitude (DA = 8130'), crappy conditions
Avg: 2659.7fps, lousy SD that I won't even repeat. May have been the conditions, chrono issues, etc.
Groups: too cold to get really anal but roughly .5-.7MOA (at 100 yds). Pressure signs: slightly flattening primers, i.e., I don't think I'll push to hit 2700fps (will probably be there anyway with this load on a warmer day). Will wait for a better day and try groups at various distances.

 

[k2peaker]

Re: 260 Loads Only

Update to the below:
Bottom line, I am now settled in at the low range of what Hodgdon suggests. 41.5gr H4350 seems to give me about 2650fps with flattened primers (using 139gr. Scenars). I use CCI BR2s as that's what I had on hand but am also testing the CCI MilSpec primers (harder cup), the Russian LR Mag, and WLR (for grins).

So I seem to be landing at the 41.5gr to 41.6gr of H4350 for this AR10 in .260 application. And, it seems to be consistent with what some folks are reporting elsewhere on the Hide. While I'm still seeing some pressure signs, they are far below the extractor marks and occasional pierced primers from below. Every rifle is different but start low and work up is good advice. I must admit I thought I could skip a step given my previous .260 experience. I was wrong.

A 'nice day' update to gas gun .260 loads from above:

Same locale, but a 50+ degree day in the mtns of CO.
DA: 9420' and no wind -- rare.

Sum: the 42.6gr H4350 load above is too hot in this gun. With the increase in DA, I was getting 2700 fps (good SDs, one at 6.0) which is what I was after but too many pressure signs (very flat primers, some flow, some ex marks, one pierced primer). A different experience from my bolt gun for sure.
So, I'm backing it off .2-.3 gr. and going for 2650 fps or so.
Groups were decent, .5" at 100 yds.
42.3 - 42.4 gr. H4350 with 139 gr. Scenars will hopefully be the landing point.

Platform: JP LRP in .260, 22", 1:8", Pmags
Load: Lapua Scenar 139gr., 42.6gr H4350 (too hot), Win .243 necked up, turned, CCI BR2, new brass so this is FireForm
OAL: max Pmag length

 

[Quickdraw40]

Re: 260 Loads Only

tag

 

[Rthur]

Re: 260 Loads Only

Rifle- 260 UGSW Infidel
barrel- Bartlien 1-8, 22.5"
brass- Nosler 7-08 necked down and turned to .013
Wolf LR primers
Lapua 139
H4350- 43.5 gr
2844
2841
2834
2854
2841
ES-20
SD-7
These rounds had a little less than half inch vertical at 300 yards.
This load is also more than one grain under pressure signs on the brass

 

[Victor Co Heather]

Re: 260 Loads Only

My .260 comp load out of 26" 8.5 twist bartlein:


123SMK
44.5 g H4350
7mm-08 Win brass (resized)
210M primers
OAL: 2.830

 

[Rodeo Trash]

Re: 260 Loads Only

I'm getting ready to start reloading for my new Savage 12 LRP 260 and I was glad to find this thread. My question on this subject is, I have large rifle magnum primers on hand so I was wondering if I can use these for my 260? Do I gain or lose anything by using them? I some what understand the concept of magnum primers. Any help on this matter is greatly appreciated and thanks in advance.

 

[81sfo]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Rodeo Trash</div><div class="ubbcode-body">I'm getting ready to start reloading for my new Savage 12 LRP 260 and I was glad to find this thread. My question on this subject is, I have large rifle magnum primers on hand so I was wondering if I can use these for my 260? Do I gain or lose anything by using them? I some what understand the concept of magnum primers. Any help on this matter is greatly appreciated and thanks in advance.</div></div>
I use cci 250 magnums in all my 260 and 308 loads ,I get tighter velocity spreads with these. To my knowledge the difference between magnum and non is the magnums have a harder cup ,but I think they are more consistant?

 

[Rodeo Trash]

Re: 260 Loads Only

Thanks for the response. I'm gonna just use the magnums then. Has anyone heard when the Lapue 260 brass is supposed to hit the market?

 

[HSNARC]

Re: 260 Loads Only

Shot a few rounds of my pet load today

win 7mm-08 necked down to .264
42.0g of h4350
123gr amax
coal 2.820
approx 2815fps
fed 210 lrp

375 yards with 8mph full value wind edge to edge 1.970

Best long range group ive ever shot 710 yards in swirling wind (i mean it was my birthday lol)3.891

 

[Jerry m]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Forwardeyes</div><div class="ubbcode-body">.....I use cci 250 magnums in all my 260 and 308 loads ,I get tighter velocity spreads with these. To my knowledge the difference between magnum and non is the magnums have a harder cup ,but I think they are more consistent? </div></div>

Magnum primers are 'hotter' then their standard version. But different manufactures of primers produce different energy levels. For instance standard Winchester LR primers may be 'hotter' then the magnum version of brand 'X'

Anyone switching to a magnum primer needs to work a new load in your rifle when changing any component(s).

Good luck

Jerry

 

[jb7032]

Re: 260 Loads Only

Reloader 19? I looked through most of the posts and didn't see many people using it. I shot some test rounds with 43 grn under a 142 sierra, AICS mag length. Looks promising, about 1" groups at 200yds. I still have to fine tune and chrono. I'm not overly concerned about velocity. Does anyone know of a reason not to use Reloader 19?

GAP,Rem 700
25" bartlein

 

[GUNENTHUSIAST]

Re: 260 Loads Only

260 Rem Load for GA Precision barreled AIAW.
Bartlein 26" 8.5 twist 5r barrel
Lapua 260 brass
Lapua 139 grain Scenar
BR2 Primers
43.5 grains H4350
2.845" OAL (.015 off lands)
2900 fps + or - 10
.25 - .5 MOA all day long!

 

[Alan_H]

Re: 260 Loads Only

Any 130 Berger loads with H4350?

 

[jb7032]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GUNENTHUSIAST</div><div class="ubbcode-body">260 Rem Load for GA Precision barreled AIAW.
Bartlein 26" 8.5 twist 5r barrel
Lapua 260 brass
Lapua 139 grain Scenar
BR2 Primers
43.5 grains H4350
2.845" OAL (.015 off lands)
2900 fps + or - 10
.25 - .5 MOA all day long!
</div></div>

I tried this same load out of my rifle, only I used Fed GM primers. The velocity was about 2940ish. The loaded ammo was tough to chamber. Upon inspection I could tell that the necks were tight in the chamber. The primer dimples were almost blown out and the brass had pretty defined ejector marks. I think this load is too over pressure for my Blood. I'm going to back off and turn the necks.

Rem 700, 25" 8.5 twist Bartlein installed by GA

 

[D_TROS]

Re: 260 Loads Only

Other than the above, is there any body who either single loads 260 or loads to mag length in a AW mag?

I want to load out to 2.90 to 2.95 (anyone know the max length to load and still have at least a bullet width in the neck?) in my AW set up yet dont have any load data available.

I realize I will be loading up to a max load anyways for load development, just want to see if anybody else has tried it.

jb7032, reason your rifle is showing such high pressure signs is you are jamming the bullet so far into the lands witha hot load. My guess is that gunenthuisist has a little more FB (longer OAL) which will result in more case capacity which equals less pressure...
at least thats how I see it.

Anybody??

_DT

 

[jb7032]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: D_TROS</div><div class="ubbcode-body">
jb7032, reason your rifle is showing such high pressure signs is you are jamming the bullet so far into the lands witha hot load. My guess is that gunenthuisist has a little more FB (longer OAL) which will result in more case capacity which equals less pressure...
at least thats how I see it.

Anybody??

_DT </div></div>
I would tend to think that more free bore = less pressure but i'm not a scientist.
gunenthuisist's OAL is 2.845. Mine is 2.885, which is just under mag length(AICS mag) and .015 off the lands for my rifle. His bullet is seated deeper in the case, which takes away case capacity. I suspect my pressure signs resulted from the tight neck to chamber fit. I had a difficult time chambering the rounds and upon inspection of a previously chambered unfired round, there were scrape marks on the neck of the casing. I turned the necks just enough to clean them up and reduced the powder by 1/2 grain. The difficult chambering and pressure signs went away. Of course I didn't have my chrono to see the velocity difference, but I'll be satisfied if it is close to 2800. I think a 139 at 2950 is exceding the normal range for the 260, at least in my opinion

BTW I also tested the newly neck turned Lapua casings with 43.5 grains of RE19 under 139 scenars and a GM primer. They shot a nice .250" five round group.

D_tros are you running an AW mag or an AICS mag? I'm not sure what the max oal length is for the AW. My AICS mag will fit 2.885 comfortably. If you have the AICS and want to run something longer there are things you can do. I'm thinking about trying out the new Alpha products mags, they have one that you can seat the bullet out as far as 2.980ish.

 

[jb7032]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: D_TROS</div><div class="ubbcode-body">I want to load out to 2.90 to 2.95 (anyone know the max length to load and still have at least a bullet width in the neck?) in my AW set up yet dont have any load data available.

Anybody??

_DT </div></div>

If you're using 139s or 140s i'm sure that at 2.9 the neck will have enough of a bite on the bullet. I loaded some test rounds with 139 scenars at 2.9 and the bullet was well within the neck. I'm not sure about 2.95, that would be .050" into my rifling.

 

[Jaxdialation]

Re: 260 Loads Only

Just got my load figured out
GAP Rem action,
26" barrel
1/8 rifling

Lapua brass
42 gr H4350,
Sierra 142 SMK
Federal 210M
.010 jump to the lands.

2780fps and .4 MOA five shot groups
ES 10-14
SD 3-4

Found this load by running a pressure test. I found the onset of pressure signs at 43g. So I backed up 1.5gr and did 5 rounds each at .1 steps. I found the best SD, ES and Groups at 42gr, 42.5 and 47.9gr. So I ran these charges through some bullet jump tests at .01, .02 and .03

 

[Jaxdialation]

Re: 260 Loads Only

Have any loads to share?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: hueys66</div><div class="ubbcode-body">How about just a 260 thread? Be thorough on data. </div></div>

 

[fw707]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Alan_H</div><div class="ubbcode-body">Any 130 Berger loads with H4350? </div></div>

Seems like they're pretty scarce.

 

[GUNENTHUSIAST]

Re: 260 Loads Only

Now that I have 1000 rounds through my barrel the load seems to have changed. My previous load of 139 scenars with 43.5 grains of h4350 is grouping about .5-.6 moa. I went back and tried the 140 berger vld again with 43 grains at 2.910 and it is averaging about .3-.4 moa.

 

[Lowe Left]

Re: 260 Loads Only

Posted elsewhere:

<span style="font-weight: bold">24" Benchmark 3-groove 1-8 twist
Necked down Win 7-08 brass
CCI BR2 primer
43.4g H4350
139 Scenar
2825FPS</span> (no signs of pressure)
2 firings, so far so good.

 

[Supersubes]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: D_TROS</div><div class="ubbcode-body">Other than the above, is there any body who either single loads 260 or loads to mag length in a AW mag?

I want to load out to 2.90 to 2.95 (anyone know the max length to load and still have at least a bullet width in the neck?) in my AW set up yet dont have any load data available.

</div></div>

I just received my reamer from PTG for exactly this purpose, using 130 JLK's and Win 7-08 brass. The dummies I sent him were 2.93, which allows for some adjustment for throat erosion. The reamer has a .295 neck and .080 free bore. Reamer JC# 119216. I'll post as soon as I get a barrel chambered up and a load worked out.
here is one of the dummies

In an AW mag

 

[BoilerUP]

Re: 260 Loads Only

Criterion 26" 8 twist barrel
R-P 260 Rem Brass
123gr A-Max
48.0gr H4831SC (lightly compressed)
WLR primer
0.010" off lands

3000fps @ 85°F and 500' MSL
ES 20/SD 8

 

[D_TROS]

Re: 260 Loads Only

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Cpl Snafu</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: D_TROS</div><div class="ubbcode-body">Other than the above, is there any body who either single loads 260 or loads to mag length in a AW mag?

I want to load out to 2.90 to 2.95 (anyone know the max length to load and still have at least a bullet width in the neck?) in my AW set up yet dont have any load data available.

</div></div>

I just received my reamer from PTG for exactly this purpose, using 130 JLK's and Win 7-08 brass. The dummies I sent him were 2.93, which allows for some adjustment for throat erosion. The reamer has a .295 neck and .080 free bore. Reamer JC# 119216. I'll post as soon as I get a barrel chambered up and a load worked out.
here is one of the dummies

In an AW mag

</div></div>

This. Thank you. Please dont forget to update

I have all my build components except for the stock. How much was the reamer? Would you be interested in loaning it for a small fee if everything works out?

Regards,
_DT

 

[Supersubes]

Re: 260 Loads Only

The reamer was $151 to my door. Looking at the print, it is pretty much SAAMI spec with .080 of freebore, which is fairly common.

From my measurements, this same reamer would work with the 142smk(or 139 scenar)in an AICS mag.

At the moment I'd rather not rent it out.

by the way, the number I referenced above is an invoice number. The reamer print number is 36172.

I'll keep you posted on the results soon.

 

[Buckoman]

Re: 260 Loads Only

see below

 

[Buckoman]

Re: 260 Loads Only

I just got my rifle back from the gunsmith using basically the same reamer from PT&G. .080 freebore .2965neck. I completed a latter test up to 46.6gr of 4831sc and so far the results are promising. So far I love the reamer. If you want to "rent" it PM me and we can work out the details