Berger .277 EOL Extreme Heavy Hybrid 170 Grain.

[Idaho Trecker]

They are reality finally! Time to get some trigger time with them. Unfortunately for me it won't be until next weekend probably.

 

[Longtooth32]

Just got my 170 Bergers…

I have a Wby 270 Benchmark barrel with the standard "Roy" freebore…

I cannot get the Bergers to hit the lands at 3.5"…mag length for me is around 3.36"…

I will load them up and see what happens…

I am pushing the Matrix 175s at 3150fps with out any issues…

The 165 Matrix at 3225fps...

 

[Longtooth32]

Just got my 170 Bergers…

I have a Wby 270 Benchmark barrel with the standard "Roy" freebore…

I cannot get the Bergers to hit the lands at 3.5"…mag length for me is around 3.36"…

I will load them up and see what happens…

I am pushing the Matrix 175s at 3150fps with out any issues…

The 165 Matrix at 3225fps...

I hit the lands @ 3.525" with the 170 Bergers with a standard Wby chamber.

I hit at 3.4" with the Matrix 165s…

Off to load some...

 

[azsugarbear]

I couldn't help but be a little surprised by the advertised G1 BC of .662. When I tested these bullets, my calculations and actual drop results suggested a G1 BC in the .69 to ,70 range.

 

[BryanLitz]

I couldn't help but be a little surprised by the advertised G1 BC of .662. When I tested these bullets, my calculations and actual drop results suggested a G1 BC in the .69 to ,70 range.

What span of velocity did you test over?

The advertised G1 BC's are averages for 3000-1500 fps. Due to the variation of G1 BC with velocity, the effective BC can be somewhat different if you're shooting it at a different velocity.

This is why G7 BC's are favored for modern bullets; they don't depend so much on velocity.

-Bryan

 

[azsugarbear]

Bryan - you're killing me! ;-)

Not doubting you numbers. Never tested BC over different velocities. That's for you brainiacs who eat this kind of stuff for breakfast. I don't have my shooter's log in front of me, but I believe I was pushing them about 3,150 fps (mild load for 277 AM). Shooting was done out to about 1000 yds. I think I was getting .69 that far out.

 

[BryanLitz]

That makes sense; over the velocity range your bullet likely experienced flying to 1000 yards, the average G1 BC would be like 0.675 according to my numbers (see below). Your number of .690 is not too far off that, it would mean a difference in drop of like one 1/4 MOA click at 1000 yards for a G1 BC of .675 vs. .690.

Getting accurate BC's from drop is very difficult but with high BC bullets and high MV it doesn't always have to be spot on!

Here's the velocity segmented data for that bullet:

      >3000   3000-2500 2500-2000 2000-1500   <1500
 G1BC 0.684     0.674     0.664     0.650     0.638
 G7BC 0.336     0.336     0.334     0.343     0.354
Averages from 3000 fps to 1500 fps:
G1 BC: 0.662 , variation of G1 BC:  0.045
G7 BC: 0.339 , variation of G7 BC:  0.020
G7 Form Factor:  0.933

 

[can1010]

is their anybody with the bullet dimensions for these. my daughter updated my computer now cant get on bergers quick reference data sheet.

 

[Longtooth32]

That makes sense; over the velocity range your bullet likely experienced flying to 1000 yards, the average G1 BC would be like 0.675 according to my numbers (see below). Your number of .690 is not too far off that, it would mean a difference in drop of like one 1/4 MOA click at 1000 yards for a G1 BC of .675 vs. .690.

Getting accurate BC's from drop is very difficult but with high BC bullets and high MV it doesn't always have to be spot on!

Here's the velocity segmented data for that bullet:

      >3000   3000-2500 2500-2000 2000-1500   <1500
 G1BC 0.684     0.674     0.664     0.650     0.638
 G7BC 0.336     0.336     0.334     0.343     0.354
Averages from 3000 fps to 1500 fps:
G1 BC: 0.662 , variation of G1 BC:  0.045
G7 BC: 0.339 , variation of G7 BC:  0.020
G7 Form Factor:  0.933

Wow!

Thank you for all the actual "numbers"...

 

[Longtooth32]

Bryan - you're killing me! ;-)

Not doubting you numbers. Never tested BC over different velocities. That's for you brainiacs who eat this kind of stuff for breakfast. I don't have my shooter's log in front of me, but I believe I was pushing them about 3,150 fps (mild load for 277 AM). Shooting was done out to about 1000 yds. I think I was getting .69 that far out.

Heck...I was/am getting 3150fps with the Matrix 175s without any pressure signs...

Stoke the fires of that AM...

I am hoping to get close to 3200fps out of my 270 Wby with this bullet...

It sucks that I have/want to load this bullet to mag length...weather permitting, tomorrow...we shall see...what happens at mag length.

 

[azsugarbear]

I did push them harder, but I was grouping them at about .5 MOA with that particular load. The higher I went, the more the group started to open.

 

[Longtooth32]

I did push them harder, but I was grouping them at about .5 MOA with that particular load. The higher I went, the more the group started to open.

Thanks for the info...that will be my max speed...

Being that I have to shoot at mag length...I cannot find the thread of the three different distances off the lands to load this type of bullet that Berger recommended to try (that has to be a run on sentence)...

Anyone have the Berger recommendations?

Thanks...

 

[Idaho Trecker]

That's some good info Bryan and az. I'm hoping to run mind between 3070 and 3130 fps in my Sherman and Sherman Short.

My long throated Sherman mox oal is 3.654" and 3.045" in my SS. It appears the oal of the bullet is about .054" longer than the 165 matrix. Hopefully this weekend I'll get some loaded and go test on some yotes.

 

[Longtooth32]

From left to right...

All .277

Berger 150, Matrix 165, Berger 170, pointed Matrix 175