Request for load data 175gr .308 (imr 4064)

[jtake]

Not responsive, but to show how what is hot for one rifle is not for another, I have done OCW on my rifle (24" AI AE III) all the way to 45.6 gr 4064 using LC 13 and 175 smks without pressure signs. I settled on 41.4 gr as it had a good node and, since I only shoot 100y, I did not need the additional velocity or stress on the barrel.

JMP what brass are you using? I've noticed some definite sticky bolt lift at 42.7gr on a hot day but no pressure signs beyond that. All my brass is full length sized -0.002 back from fire formed, partial neck sized .002 tension. Still need to chrono my load and see what I'm getting from a 20" barrel. Gonna go run some Nosler brass today 39-43 gr

[peacedivision]

Yup yup, I can shoot 42.7 all day with no pressure signs, only had sticky bolt lift shooting on a 90 degree day outdoors. At 100 yards I get sub MOA from 41-43 gr but I settled on 42.7 since it had an identical POI to FGMM 175gr and was a 10th under the Sierra manual max. Want to get a chrono before I go any hotter.

[peacedivision]

yah yah I know, 1/10th right, 1/10th down

[JMP]

JMP what brass are you using? I've noticed some definite sticky bolt lift at 42.7gr on a hot day but no pressure signs beyond that. All my brass is full length sized -0.002 back from fire formed, partial neck sized .002 tension. Still need to chrono my load and see what I'm getting from a 20" barrel. Gonna go run some Nosler brass today 39-43 gr

FC brass, generally, for .308. Limited by capacity, not pressure, 24" 1:12" AI.

[Duds0311]

Ladder tests really need distance to see the differences in the loads, and 100Y will not give you sufficient meaningful separation between the loads.

You might want to OCW testing (Optimal Charge Weight) where you look not at group size, but group location, to identify accuracy nodes. These nodes are powder ranges where minor differences in charge weight will still impact in the same spot.

Here is a link to Dan Newberry's site and instructions for performing a OCW test.

http://optimalchargeweight.embarqspa...ons/4529817134

This is what i got... i need help reading the results though

[jtake]

Looking at where you have consecutive groups of impacts in roughly the same elevation, you appear to have a node around 44.7. Since you are using 0.4gr increments, you should probably fine-tune where the node is by doing another OCW around 44.7 in 0.1 or 0.2 increments. But 44.7+/- looks fairly good.

How are the cases and primers -- I am assuming no pressure signs or sticky bolts? 44.7 is getting up there for some rifles.

This is what i got... i need help reading the results though

[Duds0311]

Brass looks good still, I found a video on you tube that better explained this thing. I am going to fire one at 43.5/43.7/43.9 and 45.1/45.3/45.5 and see the group with the three different charges what ever us tightest is what I'm going at.


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[Jasonaspears]

41.9gr of IMR 4064 with a OAL of 2.800" using FGMM brass cases and a 175gr SMK. Rifle is a 700 5R. Best grouping at 100 yards is .188" with a 3 shot group.

[waveslayer]

I would like to do a ladder test, however, the only ranges around me are 100 yards, any ideas on how to do one at 100 yards? or any tried and true loads out there for 1:12 twist? I know 175 is on the heavy end for this rifle, but i got a killer deal, and still hear good things. any help would be great, thanks!

Check out the Hide they have copied the FGMM ammo. Look it up and do an OCW test

[peacedivision]

For 100 yard shooting the Nosler manual accuracy load is pretty nice. Nosler brass, 39gr 4064 over a 175gr pill @ 2.800

back to back 5 round groups, a skilled shooter could probably tighten it up.



extremely light to shoot and brass should last a while