All the following data is from my White Oak Precision Kreiger barreled 24” 1-6.5 twist +2 gas upper.
If you’ve been following this thread you’ll note that earlier I did the recommended “barrel/gas port break in” as per WOP.
I got this upper to shoot heavies: 88 to 95gr bullets. My chamber seems to be within the published specs, although I should have asked for more free bore. Max COAL for 95SMKs in my chamber is 2.330.
I ran some numbers on Quick Load and I loaded up a bunch of ammo primarily for velocity and pressure testing.
It’s been ridiculously hot and humid here in northern Virginia for the last couple of weeks. Here are the local conditions during this testing at 0900-1000:
400’ASL
85F
90%RH
29.17HG
1800’ DA
View attachment 6941150
For a control group I shot 10 rounds of factory 90gr FGMM:
View attachment 6941153
Accuracy at 100 was good, about .5 MOA.
Okay, moving on, next was:
Berger 90VLD
Hornady virgin case
CCI 41 primer
26.4gr RL17
COAL 2.375
This was the best of the day and I neglected to screen shoot the LabRadar but I did record it:
(10 shot string)
AV 2720
HI 2736
LO 2701
ES 35
SD 10.3
Grouped about .5 MOA
The rest of the loads didn’t work nearly as well with huge ES and SD numbers but I’ll document them anyhow.
90SMK
Hornady virgin brass
CCI41 primer
26.4 RL17
COAL 2.292
LabRadar data:
View attachment 6941154
This was disappointing, about one MOA.
Next up
95SMK
Hornady virgin brass
CCI41 primer
26.0 RL17
COAL 2.312
Results:
View attachment 6941155
MOA again. Good horizontal, lousy vertical dispersion
All brass showed slight pressure signs but nothing I’m going to worry about.
I realize most of my ES comes from Unfired/virgin brass- I’ve already resized a bunch with .002-3 shoulder bump.
I only gained .3gr of case capacity so I’m not gonna change much as far as charge weights go.
I did get a little crazy this morning and threw charges with one of my Charge Masters and trickled up on my Sartorious GD305..... New 95SMK:
95SMK
Hornady brass once fired FL sized (Redding premium) chamfered and deburred
CCI41 primer
26.0gr RL17
COAL 2.290
View attachment 6941158
I will test at 300, 600 and 1K yards this weekend and get back to ‘ya......
ETA: Anyone else noticed how tight the primer pockets on the new Hornady brass is?