I’ll start
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Detail your components/process

6.5 CM, Lapua brass, 143 gr ELD-x, 41.9 H4350, Federal AR match SR primers.

1. Decap/wet tumble/dry
2. Anneal in salt bath
3. Resize (Redding competition FL bushing die, .287 bushing), prime
4. Trim chamfer
5. Powder (Hornady Auto Charge)
6. Seat (Redding competition seating die)

Shoot!

Very nice! I'd like to suggest the addition of rifle/specs to the list of other particulars. At the risk of slight derail, how does it SHOOT?

Only 5 shots? Got to be at least 10 shots to brag.
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Not bad for 10 rounds.  Alpha 6mm Creed brass, annealed, sized and run through and expander mandrel.  Fed 205M  RL 16.
.

6.5CM
Hornady brass
H4831SC and 147 ELDs

300 rum, deprime, clean in SS pins and soap, anneal, shoulder bump .002", neck size, trim/chamfer, anneal, mandrel neck size, run thru corncob media, prime, charge, seats bullet with Forrester micrometer die, run over concentricity gauge.Also on initial use brass is run over mandrel die and neck turned and primer pockets uniformed and deburred...

300rum, RP brass, 230 Berger hybrid target, 99.0 grains  RL-33, RP 9.5 primer...

Set: 28

Created: 06/06/18 02:03 PM
Description: 300rum 3.0950" test 6
Notes 1:
Notes 2:
Distance to Chrono(FT): 15.00
Ballistic Coefficient: 0.717
Bullet Weight(gr): 230.00
Temp: N/A °F
BP: N/A inHg
Altitude: 0.00
#

FPS  FT-LBS

PF
5    3218    5289.51  740.14  
4    3221    5299.38  740.83  
3    3214    5276.37  739.22  
2    3208    5256.69  737.84  
1    3214    5276.37  739.22  
Average: 3215.0 FPS
SD: 4.9 FPS
Min: 3208 FPS
Max: 3221 FPS
Spread: 13 FPS
Shot/sec: 0.0
True MV: 3220 FPS
Group Size (in): 0.00

Rifle. R-700 action squared up by Bartlein Barrels, Medium Palma, 28" 1:9 twist, Trigger Tech trigger, Fat Bastard Brake, MPA chassis, Accurate mag 3.850" magazine, Razor 4.5-27-56 optic in MPA mount, Atlas bipod..

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Are you guys loading on a single stage press? Also, which one? Thanks.

I use a coax as my single stage but I size most of my brass in a Dillon 650 with a whidden tool head

RCBS single stage press

I use a old rock chucker for depriming and sizing and a summit for loading...both single stage presses....

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It doesn't matter. SD/ES has zero to do with the press.

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Only 5 shots but that’s all I have to show

Custom built Hart LRH rifle

22” barrel 6.5x47 Lapua

Lapua brass
CCI 450 primer
38.0gr Varget
Berger130gr AR hybrid

Here’s a couple I saved from back in the day.

223 rem 75amaxs
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6.5CM 140 eldm

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Lol well if we are going all the way down to 3 shots then 0sd0es Attached File


Anything under 10 shots tells you nothing.

Good enough to warrant a picture though...

While I understand the reasoning behind this, I will disagree.

The single most important piece of data you ever get is your first data point.  After that, you are just expanding the data set and finning in gaps and refining the estimates.

Yes, you can raise the confidence level with a large sample data base but the complete absence of data prior to that first shot is bad.  You learn so much from that first shot.

Let’s just agree to disagree. 5 shot minimum to see if your reloading process shoots the same fps or real close. You can’t even consider commercial ammo to have a low ES. My reloading for my bolt rifles is usually under 20, which is fine for me. AR’s are a different animal. Usually 20-50 ES.

Are we talking regular run of the mill ARs? Or precision rigs?

I have never tried precision loading for an AR..jeez that would put me over the ocd cliff I think...having to bump the shoulder further, having to deal with much tighter COAL's, all while making sure the gas system and mag setup works to its limits...no thanks..

The numbers I posted earlier were .308 out of a large frame AR.

My .223 loads out of my AR are not as good but mid-teens ES and single digit SD, don’t have the numbers in front of me or photographic proof of that one.

I use to to think my SD was pretty good , but some SDs here are just extremely impressive

My numbers were out of a 6.5 CM AR.

Some really impressive numbers here.