LR-308

pcfixer · Aug 2, 2019

Starting a thread. Shooting a DPMS 308 Oracle. P-308 Nikon

I have 100 rounds shot to date. Seems like Hornady ammo is the worse
for accuracy in this AR.
Federal 308 150 gr soft point makes for tight groups 1 to 1 1/2 moa
Also Hirtenbeger 147 gr 7.62 X 51 shoos the same.

I've use google fu and watched several youtube video on working up different powders and bullets.
For the moment I'll working up this below...
https://thefiringline.com/forums/showthread.php?t=588671

BUT. finding imr 4320 for a deal. @1 lb rrrrright. $37.00
I'm working using Fed LR match primers.
Hornady 150 gr FMJ/ BT #3037 match bullets
use of reloaded spent brass so far is Hornady brass. Have a few FC brass
and bought a 100 LC brass online for later.

Edit. Next upgrade is replace the 7lb stock trigger. Velocity Trigger for AR-10 with 3 lb pull

Boats · Aug 2, 2019

Try some Australian Outback . 308 in it with the 168gr SMK.

Shoots fantastic in all of my . 308s including my AR10

Speed3 · Aug 2, 2019

Varget will work for 308 also

Park ranger · Aug 2, 2019

And H4895

pcfixer · Aug 3, 2019

Boats said:
Try some Australian Outback . 308 in it with the 168gr SMK.

Shoots fantastic in all of my . 308s including my AR10

No consistent data online that I can find.

Varget or H4895 may work along with a number of other powders.
Points are consistent data that can be duplicated. IE Powder type= powder in grains=muzzle velocity = load density.

https://www.shootingsoftware.com/loadens.htm

LOAD DENSITY THEORY
Powders with similar burn rates (quickness) as listed in a reloading manual often will not deliver similar results. There is a simple reason for this. Burn rate is only one powder characteristic and may not be the primary factor which contributes to accuracy in a particular caliber. Composition and granule shape also affects the powder's performance and can vary between powders of similar burn rates. The burn rate of a powder is controlled by its base composition, granule size, granule shape and often a coating on the granules. These design features also change the density of powder so that for a given weight there is more or less gas energy produced for a given volume that the powder occupies.

85MikeTPI · Aug 3, 2019

My 24" DPMS Panther clone loves the 175gr SMK over 42.7gr of varget. It would pop 600yd steel all day until it got boring..

pcfixer · Aug 3, 2019

85MikeTPI said:
My 24" DPMS Panther clone loves the 175gr SMK over 42.7gr of varget. It would pop 600yd steel all day until it got boring..

Very nice rifle. :thumbsup:

No doubts from me. I have the Oracle with 16" barrel. So that said barrel harmonics, bullet and powder combinations will be different. Thanks for input.

85MikeTPI · Aug 3, 2019

Yup, you need to test what works best in your combo. I started with the the standard 147/150gr loads, went to 168gr noslers, then 175gr SMK, then 190 and 200+ before losing accuracy and heading back. I also tried benchmark, 3031, 4064, and 8208. Take all data with a grain of salt and spend many hours testing your own, that's what makes this fun..

byf43 · Aug 3, 2019

I've got a DPMS Oracle (16") in the safe, that I had completely forgotten that I had.

Sheeeeeeesh. (Gettin' old isn't funny!)

I've not used 150 gr in .308/7.62x51. I use only 165 and 168 Sierra(s).

With H-4895 (42.0 grains) I've gotten excellent results in four .308 rifles. It's uncanny.

With W-748 (43.0 grains) I've gotten similar results.

Primer used is Winchester LR.
Brass used is Winchester or LC 87. (A lot of people don't like Federal brass, but, I've gotten exceptional accuracy with it. I've got almost a 5 gallon bucket of the stuff. I'm going to keep using it!)

Pinecone · Aug 4, 2019

OCW

http://optimalchargeweight.embarqspace.com/

You can do the load development, or run what other people have developed.

http://optimalchargeweight.embarqspace.com/ocw-load-recipes/4533485759

.308 Winchester using IMR 4895
150 grain bullet, 46.6 grains (extrapolated from following loads, untested at this writing)
155 grain bullet, 45.6 grains
168 grain bullet, 43.6 grains
175 grain bullet, 42.4 grains
178 grain bullet, 42.0 grains
178 grain bullet, good match load... use 41.7 grains with Lapua brass, 41.5 with FC brass.

.308 Winchester using IMR 4064
168 grain bullet, 42.8 grains
175 grain bullet, 41.8 grains
(these replicate Federal Gold Medal, use FC or Lake City brass)
We like 178 grain bullet and 41.5 grains in FC or LC brass

.308 Winchester using Varget
155 grain bullet, 47.8 grains
168 grain bullet, 46.0 grains
175 grain bullet, 45.0 grains (an all around favorite)
180 grain bullet, 44.1 grains
200 grain bullet, low node 41.5 grains (10 twist barrel)
200 grain bullet, high node, 43.1 grains (10 twist barrel)

CCI 200's, BR-2's, and Federal 210's work well with Varget

.308 Winchester using W748
125 grain bullet, 51.5 grains (also a Nosler accuracy load)

pcfixer · Aug 4, 2019

Pinecone said:
OCW

http://optimalchargeweight.embarqspace.com/

You can do the load development, or run what other people have developed.

http://optimalchargeweight.embarqspace.com/ocw-load-recipes/4533485759

Exactly. These do not represent the firearm I have. LR-308 16" barrel.

from original post.
The gun is a gas piston AR-10, 16.125" barrel.
46.3 gr 4320 .
Best group (5 shot) .54"
Worst group (5 shot) 1.1"

pop-gunner · Aug 4, 2019

I've had a couple LR308 rifles with 16in barrels I hunt with. I settled on a 175smk for paper and a 180 Pro Hunter for making stuff dead. With the 1/10 twist even the short barrels seem to like the heavier bullets.
With that short barrel I loose a lot of velocity so I limit my hunting with that gun to about 250-300 yards for white tail.
I still have one of these guns and my loads of 42.5gr of RL-15 will stack bullets on top of each other at 100 yards.

Pinecone · Aug 4, 2019

pcfixer said:
Exactly. These do not represent the firearm I have. LR-308 16" barrel.

It does not matter.

The concept of OCW is based on the fact that Federal Gold Medal Match shoots very well in EVERY rifle.

An accurate load is accurate.

pcfixer · Aug 6, 2019

Pinecone said:
It does not matter.

The concept of OCW is based on the fact that Federal Gold Medal Match shoots very well in EVERY rifle.

An accurate load is accurate.

Yes. I shoot pretty much by the OCW Instructions.
http://optimalchargeweight.embarqspace.com/ocw-instructions/4529817134

Along with brass case prep it's important to use fundamentals of marksmanship and steady hold.
I replaced the 7+ lb stock trigger with 3+ lb velocity trigger. Yes and big help in installing a muzzle brake.

The only difference I'm shooting 150 FMJ BT's right now and not 168 or 175 yet.

Pinecone · Aug 6, 2019

Then don't worry about the load, the bullet will limit your accuracy.

But check over on Sniper's Hide for an OCW with the 150s. I am sure someone has done it.

pcfixer · Aug 7, 2019

Loading Horn 150 match at the moment --will test 20 rds via OCW.

Looking for future loading bullets. SierraMatchKing 168, Hornady 168gr Match, Nosler LR 168gr ( has BC .525)?
Never shot any of these bullets. Especially in LR-308.

Speed3 · Aug 7, 2019

pcfixer said:
Loading Horn 150 match at the moment --will test 20 rds via OCW.

Looking for future loading bullets. SierraMatchKing 168, Hornady 168gr Match, Nosler LR 168gr ( has BC .525)?
Never shot any of these bullets. Especially in LR-308.

I wouldn't worry a ton in regards to BC with a 16" barrel.

My 20" bolt .308 with 175gr SMK is only going 2600 or so.

pcfixer · Aug 19, 2019

150s imr 4320

Today 20 rounds.. edit pic got rotated 90 degrees. aaahhhh

pcfixer · Aug 19, 2019

point of aim is circles...1st 4 center... 2nd 4 top left...3rd 4 top right, 4th 4 bottom right.. last 4 round bottom left.

43 thru 46 grains IMR 4320 at 100 yds.

Need to adjust left 1 1/2 on scope. 6 or seven clicks.

erwos · Aug 19, 2019

Speed3 said:
My 20" bolt .308 with 175gr SMK is only going 2600 or so.

Only? For a 20" barrel, 2600 out of a 175gr SMK is a pretty hot load, arguably into questionable pressures. I only do like 2560 or so with 168gr FGMM with my RPR. What exactly are you putting in there?

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