6mm SLR

[xdeano]

Juzt using win brass. Cci 200 primers. 44.0g h1000. 105g berger hunting vld. Only pushing 2717fps. Yeah its slow but i havent done any load testing at all. It was just a safety test load and produced bugholes. When i get back from the holiday travel ill do a ladder to find my top end. Id be happy with 3050- 3100fps. Ill post up a 400yd target when i get home.
xdeano

 

[cdrissel]

Hey Julian;
Ill be receiving my 6SLR next week and was wondering if you would share some of your load info. My 6SLR has a Bartlein 1:7.5 twist 5R barrel finished at 30"on a Savage action that has been blue printed and squared and bedded to the stock. It will be topped by a 12-42x56 NFS Benchrest scope. Thank you for any info given.

Forrest

I have had good luck with both H4831sc and H 1000 and 105's in a 1-8 but you will probably want to shoot 115's .

Not sure I would shoot the 115g bullets when the new Berger 105g Hybrids have a higher BC then either of the 115g bullets (Berger/DTACs). Plus you can push the 105g faster.

Which Berger 105g has a better BC than the 115g?

 

[Steve Blair]

Which Berger 105g has a better BC than the 115g?

The 105 Hybrid does not have a better B.C. than the 115 VLD or DTAC. They are functionally the same. The 105 Hybrid can be pushed a little faster and works well in an 8" twist. Until Berger or Tubb improve their 115 offerings, it is probably the best choice in 6mm. My 6mm Remington drives these at reasonable pressure and fine accuracy at 3300 fps from 32".

 

[kyreloader]

Which Berger 105g has a better BC than the 115g?

The 105 Hybrid does not have a better B.C. than the 115 VLD or DTAC. They are functionally the same. The 105 Hybrid can be pushed a little faster and works well in an 8" twist. Until Berger or Tubb improve their 115 offerings, it is probably the best choice in 6mm. My 6mm Remington drives these at reasonable pressure and fine accuracy at 3300 fps from 32".

According to Berger and Litz BCs:

Hybrid (G1/G7): .547/.278
115g DTAC: .540/.276
115g Berger VLD: .545/.279

According to those numbers, the 105g Hybrids have a higher BC as stated above. I am not arguing that functionally they may be the same BC, testing has shown that technically, the Hybrid has the higher BC.

 

[Steve Blair]

According to Berger and Litz BCs:

Hybrid (G1/G7): .547/.278
115g DTAC: .540/.276
115g Berger VLD: .545/.279

According to those numbers, the 105g Hybrids have a higher BC as stated above. I am not arguing that functionally they may be the same BC, testing has shown that technically, the Hybrid has the higher BC.

First, ignore the G1 B.C. unless a specific velocity is specified. The G1 model is such a crude approximation of the projectiles we are discussing that it is irrelevant. Second, Litz's derived B.C. numbers are an average of velocities from 1500 to 3000 fps, demonstrating that even the G7 model only approximates the subject bullet forms. However, it is a country mile closer than the G1.

The 115 VLD has the highest G7 B.C. but the difference between .276 and .279 at 1000 yards is .4 inches. A shooter would need to be real good to tell the difference.

Bryan derived these B.C. values empirically, by firing over screens and calculating the B.C. If they were shot using a Weibel Doppler Radar, the results might be different. Regardless the methodology and derived numbers, these bullets have functionally the same ballistics.

 

[xdeano]

Ok well BC's stated at such, with the same cartridge being utilized, the 105's being pushed faster would derive the winner in the ballistics curve would it not? Velocity is what would change the game.

xdeano

 

[kyreloader]

Ok well BC's stated at such, with the same cartridge being utilized, the 105's being pushed faster would derive the winner in the ballistics curve would it not? Velocity is what would change the game.

xdeano

Yes. Using JBM, the 115g Berger start at 3000 fps and the 105g Hybrid started at 3150 fps shows the following at 1000 yards. The 115g needs 26.2 MOA of elevation and has 6.8 MOA of wind drift with 10mph 90 degree wind and gets to 1000y with a velocity of 1521 fps. The 105g Hybrid needs 23.3 MOA of elevation and has 6.3 MOA of wind drift witha velocity of 1623 fps. So the 105g Hybrid at those velocities would show 2.9 MOA less drop and 0.5 MOA less drift.

I will let you decide if that is a significant difference or not. It was to me, that is why I bought 105g Hybrids for my SLR barrel.

 

[bozo699]

Ok well BC's stated at such, with the same cartridge being utilized, the 105's being pushed faster would derive the winner in the ballistics curve would it not? Velocity is what would change the game.

xdeano

Yes. Using JBM, the 115g Berger start at 3000 fps and the 105g Hybrid started at 3150 fps shows the following at 1000 yards. The 115g needs 26.2 MOA of elevation and has 6.8 MOA of wind drift with 10mph 90 degree wind and gets to 1000y with a velocity of 1521 fps. The 105g Hybrid needs 23.3 MOA of elevation and has 6.3 MOA of wind drift witha velocity of 1623 fps. So the 105g Hybrid at those velocities would show 2.9 MOA less drop and 0.5 MOA less drift.

I will let you decide if that is a significant difference or not. It was to me, that is why I bought 105g Hybrids for my SLR barrel.

I don't own a 6SLR but I came to the same conclusion with my 6xc, just's seems like a no brainer to me. In something like a 6*284 I think maybe the 115's would shine.
Wayne.

 

[LWolken]

I have two 243 Ack's. One has a brake and the other does not. While I enjoy the reduced recoil of the brake the additional noise and concussion has a negative effect. For me its a choice, Do I want a tender shoulder after a day at the dog town or Do I want a splitting head ache?

 

[xdeano]

WHAT? where did that come from? I shoot suppressed but that doesn't have anything to do with this thread either...

xdeano

 

[Dgd6mm]

With all of this B.C. stuff, going on, what I would like to know is since they now point the DTAC what's the B.C. This is not figured in Litz's book our Q.L. I have shot both at longrange alot and there is a difference.

 

[Steve Blair]

I think that Bryan wrote about 5-7% on smaller calibers. You could try taking his earlier figures and adding the 5 to 7 and see if it matches your results.

 

[offgrid]

Guys need some input weather to put a brake on a new build. It will be a 6mm SLR it should be in the 17 pound range.

I'm having a 6mm SLR built, it will have a muzzle brake. Shoot steel tactical matches.

 

[Rtheurer]

X Deno

Actually the original poster of this tread is asking about the use of muzzle breaks. But somewhere along the way some one took over his thread and changed it to what it is now, instead of starting his own tread.

But that is the way our society has been heading these days.

RussT

 

[Dgd6mm]

RussT is right, back to the OP's question. I shoot 2 6CM's which is a stouter load then the 6SLR. 1 is a 30" BR rifle with a brake and the other is a 27" without. Both rifles give me no trouble with seeing my impacts from short to longrange. Someone else had the 30" built and I acquired it shortly after it was done, had I built it, it would have been done without a brake. I could always go back later and have one put on, and so could you. Try it and see what happens.

Sometimes I get off subjects and for that I apologize.
Don Dunlap

 

[jkohler]

Guys thanks for the reply on the muzzle brake looks like I will not put one on the rifle for now and see. As I really don't like the noise involved with them my self nor the head ache after the day of shooting with them.