03-21-2021, 01:32 AM
I think I'm really going to like this barrel. Loaded up 50 of the 90 gr Sierra FMJs with 29 grains (+/- 0.1) of CFE and did some fireforming today. When I did the 5 shots a few days ago, I was sighting in another rifle and took all five shots from Rubin at 25 yards and had the last one an inch low nearly on the center vertical line - so it's not zeroed but is seemingly close. Went prone with 10 rounds and once I figured out the vertical hold, I was actually able to get down to the 4"er on a TYL rack at about 280. The remaining 40 were mostly hits on a spinner at 300 with 8" and 6" rounds mostly kneeling with the only support being my handguard on a Whiskey Charlie Max on a stool, so work some wobble into the equation. In some ways, it's actually easier to stabilize a really light rifle - just feels easier to wrap my thumb around the handguard at the end and pull the rifle and bag (with lower fingers) into my shoulder and magwell/mag. Anyways, getting all those hits on 2 MOA target at 300 with a random load and unbroken in barrel was pretty encouraging (and I'll add that the Sierra 90s didn't shoot well in my 6x45, which is why I bought them).
Dialed down the gas significantly and felt recoil was substantially reduced. The Ti carrier has an adjustable gas key and it's been a question mark if I can get it to cycle reliably with a reduced power spring and Taccom Ultralight carbine buffer (both the carrier and buffer are "recommended for use with .223/5.56 only"), but so far so good. It didn''t make neat little piles of brass like GiGi and Nozzie were today, but I need to bring stronger reading glasses next time so I can see the adjustment screw better. You can see the adjustment screw on the BCG. It's the left screw (the top screw holds it in place). Vertical is full open and horizontal is fully shut, so it's actually a tad below 50%. The little tool fits easily in a grip storage compartment.
50 more pieces of brass to make and fireform this week while finishing break in, and then it will be time to crack open a fresh keg of Varget and get to work with some105 gr RDFs.
Dialed down the gas significantly and felt recoil was substantially reduced. The Ti carrier has an adjustable gas key and it's been a question mark if I can get it to cycle reliably with a reduced power spring and Taccom Ultralight carbine buffer (both the carrier and buffer are "recommended for use with .223/5.56 only"), but so far so good. It didn''t make neat little piles of brass like GiGi and Nozzie were today, but I need to bring stronger reading glasses next time so I can see the adjustment screw better. You can see the adjustment screw on the BCG. It's the left screw (the top screw holds it in place). Vertical is full open and horizontal is fully shut, so it's actually a tad below 50%. The little tool fits easily in a grip storage compartment.
50 more pieces of brass to make and fireform this week while finishing break in, and then it will be time to crack open a fresh keg of Varget and get to work with some105 gr RDFs.