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270 weatherby bullet choice

 
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  #1  
Old 03-01-2012, 11:26 PM
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270 weatherby bullet choice

Hello all, I'm new as of tonight to this forum. I just bought a 1967 mfg date German 270 Weatherby, and as far as I can tell it has a 1 in 12 twist, the later guns were 1-10. As a little background info, I've been reloading for years in other calibers.

Here's the question. I'm going to get some components ordered and I'm wondering what others have found accurate in bullet choices in this twist and caliber. I'll also appreciate your speeds, group size and powder data to go with your recommendations. I was going to get Barnes 130 TTSX's but the Barnes site warns that it won't stabilize with that twist. My understanding is I need a bullet that isn't going to be too long for it's weight and that Barnes TTSX 110's should be fine. I may go that route, but I would have preferred something just a bit heavier. Lead is okay, but I want it to stay together and not be too explosive. For that reason I'm hesitant to go to Berger. Your thoughts would be welcomed.

If anyone knows of a chart that compares bullet choice, speed, twist, rpms and stability you have my thanks.http://www.longrangehunting.com/foru...lies/smile.gif
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Old 03-01-2012, 11:53 PM
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Re: 270 weatherby bullet choice

You may have to google to get your bullet details. But, JBM's website will calculate stability...
JBM - Calculations - Stability

-- richard
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Old 03-02-2012, 12:13 AM
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Re: 270 weatherby bullet choice

Really cool old rifle, post some pics. In my experiance with the older Weatherby's they like older flat base style bullets in lighter weights. I would start with a Partition, A-Frame, Grand Slam or possible comprimise in a Game King. Your right the barnes are probably to lone. These can be difficult to get to shoot, although no experiance with 270 Wby.
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Old 03-02-2012, 12:17 AM
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Re: 270 weatherby bullet choice

That will help a lot, thank you.
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Old 03-02-2012, 12:21 AM
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Re: 270 weatherby bullet choice

Berger lists an 11 twist for the 130 VLD. I would guess the 130 accubonds will stabilize in a 12 twist at your velocities, especially if you've got any altitude (can't find a twist rate for them). The 130 barnes will be longer. There's a gentleman on here shooting the 110 ttsx. He loves 'em. Maybe he'll chime in.

Have you verified your twist rate? Easy to do.
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Old 03-02-2012, 09:13 AM
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Re: 270 weatherby bullet choice

To determine my twist, I put a brush on the end of a cleaning rod and put a tape marker at the 12:00 position. Pushing it slowly and smoothly through from bore to end I got 1.75 turns. This in a 24 inch barrel and I'm figuring the first almost 4 inches have no twist. A 1-10 would have given me 2 full turns right?

I'll see what I can do about the picture.
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Old 03-02-2012, 09:42 AM
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Re: 270 weatherby bullet choice

Quote:
Originally Posted by grit View Post
Berger lists an 11 twist for the 130 VLD. I would guess the 130 accubonds will stabilize in a 12 twist at your velocities, especially if you've got any altitude (can't find a twist rate for them). The 130 barnes will be longer. There's a gentleman on here shooting the 110 ttsx. He loves 'em. Maybe he'll chime in.

Have you verified your twist rate? Easy to do.
Now that you mention the Bergers...

I had the Berger 130's MOA or a hair better at 3030 fps out of my PO Ackley made 270 Win with a 12 twist at 500ft altitude.

It was a stout load. But, the WBY should have at least 200fps higher MV. So, they may be worth a try.

I rebarrelled to a 1:10 in order to shoot the 165 Matrix.

-- richard
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