**6 Creedmoor**

[kyotekiller25]

Gotcha! I kinda figured the 107s were a little shorter, thus the shorter OAL length.

I haven't played with mine a whole lot either since getting my custom built 223 wylde and getting it broke in.

I'll probably wait until I have 100 rounds through the 6 creed and get all my brass fireformed before I really start getting serious with my load development. As it is, I feel it's pretty close. Gonna be somewhere around 40-40.2g H4350 at 2.795" or so. I plan to load in .1g increments and shoot at 300 yards to find the right charge, and then see if tweaking the depth a little shorter will change anything. And lastly, trying a couple different primers after I've nailed the charge/seating depth.

 

[Coyote777]

18” 1-8t X-Caliber
88g Berger FBV
CCI 450 Magnum Primer
H4350-45g
BSD-2.130 (.15 jump)
COAL-2.819
Avg FPS-3180

 

[blksno]

26" Proof Prefit
Peterson - CCI 450
RL16 - 115 Dtac
3100 fps

 

[Old Corps 8541]

How much RL 16 ?

 

[diggler1833]

Guess I got it as good as it will go for the 107 SMK / H4350 in this barrel (26", 1:7.25 Bartlein). I had two distinct plateaus in velocity for groups (not a single shot). I usually don't believe in that stuff, but this barrel has shown it enough that I'm starting to drink the "flat spot" kool-aid * in this barrel.

I beat myself about the head and neck trying to get good accuracy out of that slightly higher charge weight. 1/2 - 3/4 MOA...no better or worse.

Loaded back down to the more promising charge weight that gave good results earlier. I did not do as well as last time, but I had more wind today too (excuses, excuses). Loaded one last group and shot it at 300...it held up rather well in the wind. Guess I'm done.

Today's tests:

I tried to move the dime far enough away that somebody wouldn't think I was trying to cover anything.

Whole target:

What I was trying to duplicate and failed:

^ This is 40.0. I ran 39.9 and 40.1 over a chronograph and had an ES and SD average of 25.5 and 8.5 between the two. Velocity is going to be right at 2,950.