6.5 Creedmoor, Small Primer Brass, 147gr Hornady ELD, H4350 accuracy load?

EddieCoyle

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Does anybody have a favorite load recommendation for this combination?

I assume the COAL to be 2.800". Can someone recommend a charge weight and small primer brand/type combo as a good starting point with an AR-10?

Thanks in advance.
 

gregs

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Are you sizing to head space or seating to 2.800"? I have been loading for my RPR and AR-10. Ill check my notebook for loads.
 

TrashcanDan

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@EddieCoyle

Found this, but its 140's and large primer-


Some more searching led to this-

and then this-

Neither say if its small or large primer

More digging found this, but its large primer-

To begin the load development process, I started with new, unfired Starline 6.5 Creedmoor brass. Starline offers 6.5 Creedmoor brass with both large and small primer pockets. I elected to use the large primer pocket with a CCI 200 primer.

All shooting was done prone, from a bipod with rear bag. Velocity data was recorded with a MagnetoSpeed V3 barrel mounted ballistic chronograph. Target is a Rite in the Rain Storm Sight Target.

Results are shown in table below:



For the 147 ELD with H4350 powder, muzzle velocities ranged from 2,555 to 2,621 feet/second and standard deviation ranged from 10.9 to 17.6 feet/second. Five shot groups sizes ranged from .391″(.373 MOA) to 1.078″(1.030 MOA) with an average group size of .714″ (.682 MOA).

Good luck
 

beaker

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Thread tagged. I am just starting to do load development for 6.5 CM. Starting with a 140 grain Sierra Match King HPBT, using H4350 powder. Starline small primer brass. Many shooters use CCI Small Rifle Magnum primers, which I have and planned to use. The Starline tech info indicates non-magnum primers. Anyone think the magnum primers would pose any kind of problem here?
 

beaker

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Just did a test run, results below. Magnetospeed V1. All 5 shot groups, at 100 yards. Rifle, Bergara LRP Elite 24" barrel. I am liking group E.

I just noticed a typo in the chart. Group F was 42 gr of H4350, not 48...

1595807150561.png
 

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beaker

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Another range test, this time with Hornady 129 Grain SST bullets and Reloader 15. SD seemed high, but they all shot well and were extremely accurate. Only at 50 yards, but all were one hole cloverleafs.

1599610616409.png
 
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Lapua small primer Reloder 26 I hit 2800 with 140 eldm’s no pressure and I think 2740 with 147’s both shot under an inch 5 round groups, I was .03 off the lands
 
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I got severe pressure signs with Starline brass, 41gr of 4350, and Hornady 143s.
the Berger factory 140’s go on sale once in a while I Was about to buy lapua brass and the 140 bergers and the factory ammo popped up for cheaper than I could load it for, it was like 23 a box and now I have a couple hundred lapua cases, I don’t know anything about starline but the lapua is the best I’ve seen
 
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