Have a problem with this load keyholing at 100 yards. Load is 120 gr Barnes TSX, 22.0 to 23.0 grains BLC-2 in a Lapua case and CCi 450 primers, OAL is 2.250". At 23.0 grains, I had flattened primers, ejector marks and headstamp compression.
Barrel is an 18-inch, 3 land, polygonical, mid-length gas on an AR-15 upper. Headspacing was checked with go/no-go gauges - within spec.
Keyhole strikes are almost the entire bullet profile.
The kicker is this rifle will shoot 1/2 MOA with Nosler 120gr Partitions and Sierra 120 gr Pro Hunters.
I couldn't think of anything else to consider except velocity but if the bullet was yawing that much I didn't want to risk my chronograph. Any ideas?
Thanks,
Gunfighter
Barrel is an 18-inch, 3 land, polygonical, mid-length gas on an AR-15 upper. Headspacing was checked with go/no-go gauges - within spec.
Keyhole strikes are almost the entire bullet profile.
The kicker is this rifle will shoot 1/2 MOA with Nosler 120gr Partitions and Sierra 120 gr Pro Hunters.
I couldn't think of anything else to consider except velocity but if the bullet was yawing that much I didn't want to risk my chronograph. Any ideas?
Thanks,
Gunfighter
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