6BRX has a new little brother
- Thread starter tclaunch
- Start date
tclaunch
Silver $$ Contributor
birdog said:
I didn`t take the chronograph yet as I was just starting out with loads. I don`t load at the range yet so I took 3 powder charges of Varget 31.4, 31.6 and 31.8. Took my seating die with me as I seated the Berger 105`s to max jam here at home. The first 2 loads had verticle, and the seating had to be tweeked, but by the time I got to the 31.8 load I thought I had a decent handle on seating, and the 31.8 charge gave me a .197" 5 shot group with a bullet hole high in the group. I`m thinking 31.9 to 32 grains is going to be where she shoots. I will retest the 31.8 as this was once fired brass, and that may have caused the high shot.
I truely cannot remember ever getting a group in the 1`s with this few rounds on a barrel. I fired 30 rounds Sunday for tuning purposes. Last 5 went the .197".
I am glad you guys like the little brother!! I sure do!
Wayne call anytime sir.
tclaunch
Silver $$ Contributor
Thats exactly what I decided on. I wanted to use 1/2 of the BRX and keep 1/2 the BR neck length. The pics show this quite evidently. It is a BR +.050". I wanted to be able to use 6BR dies for this.
I wasn`t sure about doing something so similar to the BR-DX, but what pushed me this way is I e-mailed 2 of the best shooters I know and asked them their opinion of the BR-DX and neither replied....
This was quite "out of character" for these guys soooo I knew I was on the right track. 8)
I wasn`t sure about doing something so similar to the BR-DX, but what pushed me this way is I e-mailed 2 of the best shooters I know and asked them their opinion of the BR-DX and neither replied....
This was quite "out of character" for these guys soooo I knew I was on the right track. 8)Re: 6BRX has a new little brother, velocity should be in the 2930 area
Velocity
The standard 6 BR shoots the 105 about 2750 fps from a 26 inch barrel with 30.0 gr.,
then change 30.0 gr to tenths, you get 300 tenths.
Then 2750 / 300 = 9.16 feet per second per one tenth gr of Varget powder.
Shooting 32.0 gr or 320 tenths.
9.16 x 320 = 2931 fps
That depends of lot of powder variance and barrel velocity variance.
Looks to have an advantage over the standard 6 BR,
If your shooting in the high 1's, I think it worth doing.
Velocity
The standard 6 BR shoots the 105 about 2750 fps from a 26 inch barrel with 30.0 gr.,
then change 30.0 gr to tenths, you get 300 tenths.
Then 2750 / 300 = 9.16 feet per second per one tenth gr of Varget powder.
Shooting 32.0 gr or 320 tenths.
9.16 x 320 = 2931 fps
That depends of lot of powder variance and barrel velocity variance.
Looks to have an advantage over the standard 6 BR,
If your shooting in the high 1's, I think it worth doing.
bozo699
Gold $$ Contributor
Re: 6BRX has a new little brother, velocity should be in the 2930 area
I am like Tim,..I am interested in your math? I believe it is quite low but I am still interested. A 6brx will do approx. 3000 fps with a 107 SMK, I have actually been right at 3100 with it but my sons shoots best between 3000-3030 fps that is with .100 of the of the n/k and shoulder of the std. 6br blown forward which will give you 100-150 fps over the parent cartridge so if you half that, I would think you would be looking at a easy 3100-3150 fps with this ne 6brTC. I really like the sound of that,......6BRXTC ;D
take care.
Wayne.
David,David2 said:Velocity
The standard 6 BR shoots the 105 about 2750 fps from a 26 inch barrel with 30.0 gr.,
then change 30.0 gr to tenths, you get 300 tenths.
Then 2750 / 300 = 9.16 feet per second per one tenth gr of Varget powder.
Shooting 32.0 gr or 320 tenths.
9.16 x 320 = 2931 fps
That depends of lot of powder variance and barrel velocity variance.
Looks to have an advantage over the standard 6 BR,
If your shooting in the high 1's, I think it worth doing.
I am like Tim,..I am interested in your math? I believe it is quite low but I am still interested. A 6brx will do approx. 3000 fps with a 107 SMK, I have actually been right at 3100 with it but my sons shoots best between 3000-3030 fps that is with .100 of the of the n/k and shoulder of the std. 6br blown forward which will give you 100-150 fps over the parent cartridge so if you half that, I would think you would be looking at a easy 3100-3150 fps with this ne 6brTC. I really like the sound of that,......6BRXTC ;D
take care.Wayne.
MarkS
Silver $$ Contributor
tclaunch,
My 6BRX's can run 3050 f/s to 3100 f/s, but I have found that 2975 f/s is the best accuracy. Mike Davis, Larry Isenhour, and myself, shot our 600 yds record at this speed, same bullet and same load. Your new round should run at that speed. Some guys get hung up on speed, go for the accuracy. Keep us updated.
Mark Schronce
My 6BRX's can run 3050 f/s to 3100 f/s, but I have found that 2975 f/s is the best accuracy. Mike Davis, Larry Isenhour, and myself, shot our 600 yds record at this speed, same bullet and same load. Your new round should run at that speed. Some guys get hung up on speed, go for the accuracy. Keep us updated.
Mark Schronce
tclaunch
Silver $$ Contributor
Re: 6BRX has a new little brother, velocity should be in the 2930 area
This was about letter perfect.
And as a further compliment to this math I put in a desired speed of 2980, (MarkS), and divided this by the 9.16 and see it would take 32.53275 grains to get there. This was after I shot Monday morning I took 2 charges of 31.9 and 32 grains. I took the new Hybrids with a 32.5 grain charge and presto 2980 fps.
David2 said:Velocity
The standard 6 BR shoots the 105 about 2750 fps from a 26 inch barrel with 30.0 gr.,
then change 30.0 gr to tenths, you get 300 tenths.
Then 2750 / 300 = 9.16 feet per second per one tenth gr of Varget powder.
Shooting 32.0 gr or 320 tenths.
9.16 x 320 = 2931 fps
That depends of lot of powder variance and barrel velocity variance.
Looks to have an advantage over the standard 6 BR,
If your shooting in the high 1's, I think it worth doing.
This was about letter perfect.
And as a further compliment to this math I put in a desired speed of 2980, (MarkS), and divided this by the 9.16 and see it would take 32.53275 grains to get there. This was after I shot Monday morning I took 2 charges of 31.9 and 32 grains. I took the new Hybrids with a 32.5 grain charge and presto 2980 fps.
Re: 6BRX has a new little brother, presto 2980 fps
This math works great for powder lot that vary, I’ve had powder lot varying
and it help on which way to load, that is to add or reduce the
powder charge to get to my rifle accurate velocity.
I’m going to add the MSSA range to my bucket list. It’s 665 miles south.
Good luck shooting this season.
This math works great for powder lot that vary, I’ve had powder lot varying
and it help on which way to load, that is to add or reduce the
powder charge to get to my rifle accurate velocity.
I’m going to add the MSSA range to my bucket list. It’s 665 miles south.
Good luck shooting this season.
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