Ok, New Barrel (40 rnds) 24" long chambered by Accuracy Systems Inc.
Passes a Go Gauge, does not pass a no-go, so headspace is fine.
Distance to lands with 168gr Sierra is 2.775"
I loaded up a "pressure" test with 168gr Sierras with IMR-4094 at 2.765" COL. I'm using Nosler brass fired Once, resizing/loading using Forster Benchrest dies. Federal GMM 210M primers
41.5gr 4094 was where I started, but alas the beginnings of a cratered primer
42.0gr was a serious cratered primer that was almost pierced.
today was 70°F
I'm guessing that a chrono would help verify velocity, but it didn't seem like starting with hot loads.
I'm guessing I'll need a throat reamer, but I'm hesitant to do so since I'm undecided between the 155-175 bullets.
What are your thoughts, and is there anything brass prep or brass measurements I can check? I'd again make another guess that if the necks of the brass are too thick that I'd have pressure problems too? I have not tried other brass.
edit: I've got my reamer print right in front of me, and it has .343 neck diameter, .309 freebore diameter, and .075 freebore length.
Best I can tell from the standard 308Win print is that the freebore length of standard is .090
-Mac
Passes a Go Gauge, does not pass a no-go, so headspace is fine.
Distance to lands with 168gr Sierra is 2.775"
I loaded up a "pressure" test with 168gr Sierras with IMR-4094 at 2.765" COL. I'm using Nosler brass fired Once, resizing/loading using Forster Benchrest dies. Federal GMM 210M primers
41.5gr 4094 was where I started, but alas the beginnings of a cratered primer
42.0gr was a serious cratered primer that was almost pierced.
today was 70°F
I'm guessing that a chrono would help verify velocity, but it didn't seem like starting with hot loads.
I'm guessing I'll need a throat reamer, but I'm hesitant to do so since I'm undecided between the 155-175 bullets.
What are your thoughts, and is there anything brass prep or brass measurements I can check? I'd again make another guess that if the necks of the brass are too thick that I'd have pressure problems too? I have not tried other brass.
edit: I've got my reamer print right in front of me, and it has .343 neck diameter, .309 freebore diameter, and .075 freebore length.
Best I can tell from the standard 308Win print is that the freebore length of standard is .090
-Mac