New 6BR, thanks to you guys!

[6.5grendel]

Just put together my first 6BR. It's going to be used for PRS style matches out to 600 yds and for my wife to shoot when she goes shooting with me. I've had a couple recent threads asking everyone's opinion on caliber between 6BR, 6GT, 6×47, and 6XC, and then 6BR, 6BRA, 6BRX, and 6 Dasher. I decided on the straight 6BR and am very happy with it. Thank you everyone for the advice and the help on making this decision. I loaded up 8 rounds in steps of .3 from 27.9 to 30.0 gr of varget to look for pressure signs. No pressure signs so I loaded 3 foulers and then 4 of each charge weight from 28.2 to 30.0 and shot this target. This was shot from same bipod and bag that is in pic at 100yds. 1 inch dots and 4 shots at each dot except for foulers. I think everyone is right that it will be boringly easy to get it to shoot good.

 

[Kracken McGraw]

Looks good!
What seating depth did you go with on this test?

 

[6.5grendel]

I honestly don't know. I couldn't find my 6mm comparator bushing when I went to load these. I just seated a bullet long in a empty case with die wax on the ogive of the bullet, chambered the round, ejected it, measured the COAL of that round, then adjusted my seating die until it was touching that bullet, then ran the seating die down another .020. Left my seating die there for the 8 rounds that I used to test for pressure and the rounds that are in this picture. So short story is they are seated .020 from jam. No idea where they are seated in relation to in or out of the lands. I need to find my 6mm bushing or make or buy another. I can give you a COAL when I get home but it varies bullet to bullet.

 

[HTSmith]

Good on you! The 108 Bergers are the least sensitive to seating depth in the Berger line in my experience, but they still have a "sweet spot". Give it a seating depth test next.

 

[Buzzsaw]

Congrats on your new 6mmBR. I'm about to undertake one myself, same type game but not as active. Are you thinking about using a tuner? Not sure your velocities but a tuner could bring any of the groups tighter with a click or two in each direction.

Just a thought I'm going through right now. The caliber is so freeking accurate, not sure there is a "bad" node, especially with the Varget and load data.

 

[GSRswapandslow]

are you mag feeding them, or just single feeding on top of the mag?

 

[6.5grendel]

Congrats on your new 6mmBR. I'm about to undertake one myself, same type game but not as active. Are you thinking about using a tuner? Not sure your velocities but a tuner could bring any of the groups tighter with a click or two in each direction.

Just a thought I'm going through right now. The caliber is so freeking accurate, not sure there is a "bad" node, especially with the Varget and load data.

Velocities were from 2600 on the 28.2 gr varget up to 2780 on the 30.0 gr varget. I probably wont use a tuner on this one. I have been looking at the different models though for another project.

 

[6.5grendel]

are you mag feeding them, or just single feeding on top of the mag?

I will be mag feeding this for PRS style matches and when shooting steel. While doing load development I have just been single feeding on top of the mag. I have only tried running 3 rounds through the mag so far. It's a MDT .308 AICS mag so I just tried centering the rounds in the mag. It cycled through those three fine but I don't know how it would do running it hard or with 5-10 rounds in the mag. I'm thinking I'll probably have to get the MDT 6BR mag for it to run smooth.

 

[GSRswapandslow]

im about to build a howa 6br...and was considering doing a bravo for it (i have 3 others and like the ergonomics) but didn't want to worry with making it feed.

Im not really a fan of magazines, though, so i'm just going to single feed

 

[Dgd6mm]

My 6br is in a KRG Bravo Chassis and using MDT 6br mags. Running great. Bighorn Origin action.