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240 weatherby mag

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Unread 12-23-2011, 08:11 AM
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Join Date: Oct 2011
Posts: 61
Re: 240 weatherby mag

I will be sure to let you know when/if I decide to move forward. I am considering a Ruger M77 action for the rifle as the gun already has the correct bolt face. I agree with "if you want it, get it, regardless of barrel life." I love fast, accurate guns and the faster the better. I would love to have the fastest commercial cartridge in each caliber up through 338. I have not ventured into the over 30 club yet. Working on the under 30's first.
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Unread 12-23-2011, 02:38 PM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Re: 240 weatherby mag

I have all the top fast 6mm's. The 240 wby is the same performance as the 6mm-06 however the brass is the killer with it. You are forced to wby or norma brass way expensive. The 6mm-06 imp and the 240 gibbs are screamers. The 243 AI is an excellent cartridge near the 240 wby. I love my 240 wby and it is the fastest commercial 6mm I own. The only drawback is the brass cost when all the others use cheap brass. My 240 Gibbs shoots such incredible velocities people don't believe it until they see it. If you just wanted the fastest I would get it. It is very accurate. Barrel life with a rifle depends on how you treat it. I have some screamers with good barrel life.
Predictions are difficult, especially when they involve the future
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Unread 12-23-2011, 05:56 PM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 2,063
Re: 240 weatherby mag

If you wanted even more velocity and you didn't mind opening up the bolt face you could make a 6mm-264 win mag. I just checked Ken Howell's book to compare case capacities:

240 weatherby 90 gr of water
6mm Gibbs 98 gr
264 win mag 117 gr

The 90 gr vs 117 gr is a 23% greater case capacity. Using John Barsness's 1/4 rule (velocity is one fourth case capacity increase) the 6mm-264 would yield a 5.75% increase in velocity over the 240 Weatherby.

I remember Ross Seyfried made one years ago. I still remember his description. He said it was the closest to a deathray of any rifle he had ever shot. I also remember he ruined the first barrel by not cleaning it often enough. He said it had hard ceramic like build up in the throat area. He said it required a great deal of cleaning to prevent it. He cleaned the second barrel more frequently and prevented the issue. His father killed an anteope and he talked of blowing up a crow IIRC.

If you went this route it would solve the brass issue but add costs for custom reamer and dies. Just a thought.


I have a M77 Tang safety Ruger LA that I barreled in 257 Weatherby. The fit was going to be a bit tight so I had my gunsmith lengthen the magazine box out as far as possible. It would be something you might consider as the Ruger magazines run short. ( I realize the 240 is 2.5 while the 257 is 2.549")
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Unread 12-23-2011, 08:22 PM
Bronze Member
Join Date: Oct 2011
Posts: 61
Re: 240 weatherby mag

Thanks for all the ideas. I love off the wall calibers but I want to with this collection, stick with off the shelf calibers. Sounds strange I know, but I want to assemble a collection of the fastest off the shelf calibers at the time.
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Unread 12-24-2011, 11:45 AM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
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Re: 240 weatherby mag

I love the performance of the 240 Wby for medium big game but I really am not a fan of the brass, especially Wby brass. Personally, I much favor the 6mm-06 as it will easily match the great performance of the 240 Wby, do so with no fireforming needed and do so with much better, much cheaper, much easier to get brass.

Some will say dies are way to expensive for the 6mm-06, not really. Get a 25-06 FL die, and a 243 FL sizing die, both can be had for around $25-$30 and then just get a 243 bullet seating die and your good to do. Use the 25-06 FL die for body sizing and shoulder bumping if needed, 243 FL die for neck sizing and 243 Seater die to set bullets. Works great. Just have to have the dies set up at the proper height in the press.

Other then brass, I have no issues with the 240 at all, great performance as mentioned. You would be better served as mentioned with a bit faster twist. I use alot of Lilja barrels and have found that in Lilja barrels, a 1-8 is a bit fast for most long range, thin jacketes match bullets such as the A-Max and Berger. With the velocity of the 240 which falls right in there with the 6-284 and 6-06, the 1-9 twist barrels are plenty for anything up to 107 gr SMK plus they tend to allow a bit more velocity potential before bullets start to come apart at these high speeds possible with these chamberings. Again, this is generally with Lilja barrels, other 1-8 twists may be fine, I just find there is no need for this much twist in this class of 6mm for 105 to 107 grain bullets.

I put together a 240 Wby together this summer for a customer in an 8 lb rifle and tested it at 900 yards using the 95 gr Ballistic tip as it had a 1-10 twist barrel. Normally I would never test a rifle this light at 900 yards but I was testing a couple other rifles and was already set up so I decided what the heck. The little, light 240 Wby met my accuracy requirements at 900 yards easily, I was very impressed with its performance. Now conditions were very good but in the right conditions, this level of performance can be very impressive.
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

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Unread 05-07-2013, 02:17 AM
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Join Date: Jun 2003
Location: Portland, Oregon
Posts: 81
Re: 240 weatherby mag

John Whidden won the Camp Perry NRA championship shoot using, a 1 to 8 twist ratio barrel shooting 105 grain Berger VLD bullets at 3300FPS. No bullet blowup's!
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Unread 05-07-2013, 05:28 AM
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Re: 240 weatherby mag

Originally Posted by Joel Russo View Post
BB is absolutely correct. I loved the cartridge, so I built a custom rifle with an 8 tw 28" barrel similiar to BB's. Mine lives on a steady diet of the 105 gr bullets and a stiff dose of RL22. The 105's leave the business end at 3,380 which is light years above the factory offerings.
He copied off of me...

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