Load data for the 175 gamechanger in the 270 weatherby

[derfssor]

had a mark V rebarreled with a benchmark 277 barrel with 1x8.5 twist. I have been shooting bergers 170 classic with great results. Not sure if using the same load date would be OK with the Sierra. Any recommendations? I have been loading for a long time but have also had some very trying experiences with loads in a rather thin jacket and heavier jacketed bullets. That is why i am asking if anyone might be loading for this bullet in the weatherby.

 

[MagnumManiac]

Whatever load you are shooting now with the 170g will most likely be within .5g for the 175g.
I have a 9 twist 270Bee, barrel is brand spanking and haven't had time to use anything other than the 150g ABLR, which is what I was using in the old 10 twist barrel. Same load as previous barrel was close, settled on a load that was .9g heavier. I'm running Retumbo.

Cheers.

 

[Deleted member 115360]

Following.

Just got my 1-8.5 twist 270 bee back from the Smith.

What kind of m.v. are you guys getting?

 

[derfssor]

I am normally not concerned about MV, mainly accuracy. MV in my opinion means nothing if you can not hit what you are aiming at. Just my 2 cents worth.

 

[Bater]

I assume that means he doesn't have a chrono…

 

[derfssor]

Yes, i have one, just don't use it much.

 

[rustyshackleford]

I'm pretty sure they use a thicker tapered jacket on the game changer line so you shouldn't encounter any issues with them coming apart.

 

[Idaho Trecker]

I'd recommend starting lower than you think. I started shooting these in my 270ss for barrel break in. They have a super loooooong bearing surface and to go with that the lot I have is slightly over diameter. I think they were .2774.
When I measured 170 Berger and 165 matrix for diameter they were right on 277. Might be a general design sierra does. My 135 smk were also slightly bigger diameter. I'll be interested to see what you guys with the larger capacity can do with them.

 

[Window]

Whatever load you are shooting now with the 170g will most likely be within .5g for the 175g.
I have a 9 twist 270Bee, barrel is brand spanking and haven't had time to use anything other than the 150g ABLR, which is what I was using in the old 10 twist barrel. Same load as previous barrel was close, settled on a load that was .9g heavier. I'm running Retumbo.

Cheers.

Interesting. What velocity are you getting with Retumbo with the 150's?

 

[MagnumManiac]

Interesting. What velocity are you getting with Retumbo with the 150's?

I have a 28" barrel and get just over 3300fps with the 150ABLR, in the previous 26" 10 twist I was getting around 3250fps with them. I shot that barrel out using 150g Parttitions at a tad over 3200fps.
I was not happy when I shot it out actually, only got 1300 odd rounds out of it, never shot it hot, I don't think the stainless barrel had been heat treated correctly.
The new barrel has been cryo'd.

Cheers.