Hornady 123 SST Load Development

[stokesrj]

Now that the bullets are getting to the members here I would like to start this new thread specifically to capture our field results and hone in on what works. To do this well, we need the following information.

Powder
Charge Weight

Case
Primer
COL

Barrel
Chamber
Make
Length
Twist
Chronograph Model
Average Velocity
Number of rounds
High Velocity
Low Velocity
Standard Deviation

Average Group Size in MOA
Distance
Largest Group Size
Smallest Group Size
Number of shots per group

Temperature

Pics appreciated

[stokesrj]

[stokesrj]

[sneaky one]

Bob, what is the jump to lands - when loaded @ 2.250 in your chamber? Does your Satern have the -compound chamber- as an AA bbl. does?

[Blacklab]

Nice shooting!

[LRRPF52]

Were both of those groups shot with the Magnetospeed attached to the barrel? That's an insane jump into an accuracy node if I ever saw one!

[stokesrj]

Bob, what is the jump to lands - when loaded @ 2.250 in your chamber? Does your Satern have the -compound chamber- as an AA bbl. does?

They touch at 2.287 so .037" jump. Yes compound throat on this one. I have others that are standard lead.

Bob

[davidj]

Bob,
How do these compare to your A-Max stats?

[A.D.D. AR]

quick 123gr SST range report.... (sorry, not very scientific)- AA 19.5'' hunter upper, measured with oal gauge (used 3 diff. bullets) average to lands= 2.252'', loaded up 5 rounds in 2x AA brass, CCI 450's, loaded to 2.242'' col ,
31.0gr of CFE 223. about 23 degrees, with 20mph gusting wind and freezing fingers! (excuses excuses) from bench, inbetween buddies sighting in new rifles.... 100 yards, 4 shots, right at 3/4 moa pulled 5th shot to 1 1/2 moa. will have to work more on this when its not too cold! (might be a while). Just as a reference I load 123gr Amaxes to 2.248'' col.
-mike

[Kikn]

2012-12-22_21-23-16_358.jpg

[Kikn]

Western TAC

So here is the results I achieved today


Powder Western TAC
Charge Weight 27.9 Grains

Case Alexander Arms
Primer WSR
COL 2.250"

Barrel
Chamber 6.5 Grendel
Make
Length 16" Tactical (With Suppressor)
Twist 1:7.5"
Chronograph Model Chrony F1 (velocity was taken afterwards without use of the suppressor)
Average Velocity -- 2406 (50* outside temp)
Number of rounds 5
High Velocity -- 2425
Low Velocity -- 2385
Standard Deviation
Average Group Size
Distance 100 yards
Largest Group Size 1"
Smallest Group Size 1/4"
Number of shots per group 5

2012-12-22_21-23-33_684.jpg

[Kikn]

Western TAC

So here is the results I achieved today


Powder Western TAC
Charge Weight 28.2 Grains

Case Alexander Arms
Primer WSR
COL 2.250"

Barrel
Chamber 6.5 Grendel
Make
Length 16" Tactical (With Suppressor)
Twist 1:7.5"
Chronograph Model (Unused forgot my tripod)
Average Velocity
Number of rounds 5
High Velocity
Low Velocity
Standard Deviation
Average Group Size
Distance 100 yards
Largest Group Size 1 1/2"
Smallest Group Size 1 1/4"

2012-12-22_21-23-42_187.jpg

[Kikn]

Western TAC

So here is the results I achieved today


Powder Western TAC
Charge Weight 28.5 Grains

Case Alexander Arms
Primer WSR
COL 2.250"

Barrel
Chamber 6.5 Grendel
Make
Length 16" Tactical (With Suppressor)
Twist 1:7.5"
Chronograph Model (Unused forgot my tripod)
Average Velocity
Number of rounds 5
High Velocity
Low Velocity
Standard Deviation
Average Group Size
Distance 100 yards
Largest Group Size 2"
Smallest Group Size 1"

This one could have been better but I was rushed and had to sort of rapid fire as the range officer was nice enough to let me shoot this last one before he called the range cold. There was one at the bottom was when I got the tap to stop. 0_o

2012-12-22_21-23-50_631.jpg

[skyfish]

Some quick measurements from my 18" AA Barrel. It is the standard barrel from several years ago in 18", not sure of maker.

Measured with comp: 1.666-1.668 (these are touching the rifling)
COL: 2.238-2.240 (touching, first test reloads are loaded at 2.230 or 1.58 on comp)

So according to others, my chamber is rather short. It is a compound throat, or at least should be from AA. If it gets in the 20's this weekend, I'll try and post some groups and velocities.

About the SST. Mine were all within .001 for length with comparator, I thought that was very good. Also, all that I weighed were between 122.9 and 123. Very good I thought. I did not measure and weigh all, it was getting boring and in a self loading rifle. It should be good enough.

[txgunner00]

Were both of those groups shot with the Magnetospeed attached to the barrel? That's an insane jump into an accuracy node if I ever saw one!

That's what I was thinking... Looks like these bullets might be a little sensitive.