270 weatherby bullet choice

[150pilot]

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/forums/images/smilies/smile.gif

 

[rscott5028]

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

-- richard

 

[dig]

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.

 

[150pilot]

That will help a lot, thank you.

 

[grit]

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.

 

[150pilot]

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.

 

[rscott5028]

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

 

[rscott5028]

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.

Do you mean that the chamber has no twist?

Or, do you mean the first 4 inches past the throat have erroded?

If that's the case, it's time to rebarrel.

How does it shoot with factory ammo?

My dad had a 270WBY Mark V many years ago. Still does. But, it's a safe queen because it never shot better than 2 MOA with factory ammo.

Some day I'll get it our and try tuning it up. But, it's a beautiful rifle nonetheless.

-- richard

 

[mrultramag]

WBY brass, Fed 215M, 130 Hdy interbond, 75.5 gr IMR 7828, OAL3.350(IIRC), Shoots good out of my rebarreled pre 64 M70. 3450 fps. Advertised BC of bullet is .460 The 150 IB is .525
AS ALWAYS, WORK UP YOUR LOAD FROM BELOW for your gun

 

[150pilot]

Richard, Yes I did mean the chamber having no twist, the barrel throat looks like new. Is there a better way to check for twist? I tried the same trick in a 358 Winchester, it has a new barrel but the brush didn't bite as well to give me a steady turn.. I knew the twist but forgot, it's not stamped, and I didn't get the barrel paperwork with the gun.

 

[150pilot]

The stability calculator is wonderful. Thank you! I have not yet fired this gun, it followed me home about 10 days ago. The 130 gr Bergers may well be worth a try.

Digger here is an attempt at pictures.

The scope is one I had never seen before. German optics made by Pecar Berlin a variable 3-7 and clear as a bell. This scope was over a hundred bucks in 1967 and came with a 30 year warranty. Sure beats the weaver I bought new for $10 about 1969.

 

[grit]

Using a tight patch push the rod in until you get positive turning. Now mark a straight line top dead center of the rod for sixteen inches or so. Mark the rod where it enters the barrel. Slowly push the rod in until you've made a complete revolution. Mark the rod where it enters the barrel again. Pull the rod out and measure between the two marks. You get one full turn in x amount of inches. Repeat the process a few times to verify your measurement.

 

[150pilot]

I see the photos are reversed, it's a right handed gun.

 

[dig]

Great looking rifle and Pecar scopes are a collectors item these days, there is a huge fan club around them. The Germans did and still do make the best glass. With that set up which I would certainly leave alone I would stick with the partitions or grand slams, your probably better off terminal performance wise for the distances you will shoot as well. Congrats on a peice of rifle history.