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OP
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105's seem to go to sleep in the 3300 fps max. 105's do not shoot well past 3300 as a general rule of thumb.
Weatherby brass sucks for holding pressure on the top end, and your expectations are to push the top end+.
You could do this with a 244 AI and save a bunch of barrel life.
If you go with the 244 AI or the 6/06 AI, you can push the limits on pressure by using PMC 7x57 brass or PMC 270 or 30/06 brass. Lapua is another option.
One thing that you should remember is that VLD bullets will not stand a .300 freebore. Not quite sure what you're implying when you say Wby brass sucks for holding pressure on the high end. Not trying to be a smart azz, just curious what you mean by your statement. I run both my 257 and 270 Wby's on the top end and have had no problems. Just shorter brass life as with any cartridge, but nothing excessive. As for the Freebore, the 240 doesn't run the standard .378 of the other Wby cartridges. It's quite a bit shorter. Don't know the exact number, .169 possibly,as someone mentioned earlier.
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I'd say go for it. The standard 1 in 10" twist stabilizes 105g Speer Spitzers out of a 243 just fine, but the VLDs are longer so a somewhat faster twist makes sense. Have you considered a1 in 9" twist and run the numbers? When I had a 243, I loved shooting those sweet little Sierra 70g HPBT varmint bullets at 3400 fps. Those and the Speer 105g spitzer were my goto bullets for my 243.
My 270 Weatherby brass is made by Norma and is excellent. I fireform my 375 Weatherby brass using Remington 375 H&H brass with reloads which also works well.
Regards,
Chuck
"There's a saying in prize fighting, everyone's got a plan until they get hit"
Ghost And The Darkness
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Campfire 'Bwana
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I had a CATBIRD built 2 years ago,it's a 6mm-270Winchester and my gunsmith has built several in this caliber.He used his load with 105GR AMAX AND 270 Win brass,the rifle shoots better than 1/2 in groups and smacks the HELL out of deer and hogs and varmints.He also told me it was faster than his 240 Weatherby.
Last edited by crittergetter; 10/24/12.
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Campfire 'Bwana
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What twist, crittergetter?
DF
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Have you considered a1 in 9" twist and run the numbers? I would not even bother with anything other than a 7.5 or 8 twist if you want to shoot high BC bullets. My Ruger is a 9 twist and will not not shoot 105's past 100yds before they start drifting.
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Campfire Regular
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OP
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Have you considered a1 in 9" twist and run the numbers? I would not even bother with anything other than a 7.5 or 8 twist if you want to shoot high BC bullets. My Ruger is a 9 twist and will not not shoot 105's past 100yds before they start drifting. Good input dog. Re-enforces my decision to go with an 8 twist.
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Campfire Regular
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Question for you guys who have experience with the 6mm-06...how much trimming and neck turning is involved with this cartridge?
Do most people use the 25-06 casing and run it through a 6-06 die, or does the 30-06 or 270 case work better?
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Is there enough difference in performance to justify the added expense? Weatherby cartridges are at least twice as expensive as standard cartridges.
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Joined: Nov 2010
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Campfire 'Bwana
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Campfire 'Bwana
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Question for you guys who have experience with the 6mm-06...how much trimming and neck turning is involved with this cartridge?
Do most people use the 25-06 casing and run it through a 6-06 die, or does the 30-06 or 270 case work better? From my experience, making .257 Wby cases from 7mm RM brass, I found the least sizing, the better. In that instance, .264 Win Mag cases are probably better, as the brass is worked less and there is less chance of necks ending up too thick. So, given that concept, I would use .25-06 brass instead of larger caliber cases. That's the same reason I use .25-06 cases when forming .240 Wby. brass. BTW, it's a lot easier to make 6mm-06 cases than .240 Wby. cases. DF
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Unless it won't shoot, getting rid of a 25-06 is never a good idea. It is a shooter, but so is my 257 wby, So not too big of a deal. I'd do it. The .257 Bee already cancels out the 25/06 so why not do something else. Keep the classic and do it over as a 6/06 or trip it and buy the Bee Utralight in .240. I just finished setting up my Bee U/L in 240 which I traded my buddy for which was formerly owned by JB. Going to pull triggers this weekend and I'm expecting great things.
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Campfire Outfitter
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Would fly a duplicate remmy standard contour 8T. Your using your stock and action, makes sense to have a drop in. Leave the action alone and keep your 25 barrel. You can always turn it back into your classic when your done.
As far as Weatherby vs 06' case your on your own. Only amounts to how much free time you have.....
W
"I would build one again, if it were not for my 350RM (grin)."
MtnHtr
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have always wanted a 240. I think you said all we needed to know right there. You want one, so build it. If it was mine, I'd keep the 25-06 (have one now) or go 6-06 (did that once) or the AI version but it's not mine - it's yours and you want a .240 Roy. What more reason do you need? Build it and have fun.
Never give up on something you can't go a day without thinking about.
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Come on America,
Athletes and actors are not heroes, only soldiers, airmen,marines and sailors get that respect�and let's add firemen and LEO's
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Why? What can the .240 Wby do that the .25-06 can't? The older I get, the more practical and logical I become...  What advantages does the .240 Wby have? You can shoot a 100 gr. bullet at the same speed or faster out of the .25/06. Re: the latest Hornady manual, top velocity for the .240 Wby with 100 gr. bullet; is 3200 f.p.s. The .25/06 gets 3300 f.p.s. Top velocity for 75 gr. bullets in the .25/06 is: 3700 f.p.s. The .240 only does 3500 f.p.s. True, you get a slightly better ballistic Co-efficient with the .240 Wby, but that really comes into play well beyond 300 yds...  Plus, another advantage to a .25/06; is that you can shoot 115-120 gr. bullets... But if a .240 Wby scratches your itch, then: Go for it... Nothing is worse that "settling" for one chambering when you WANT another...  GH
"As you walk thru life, don't be surprised that there are fewer people that you encounter seeking truth than those seeking confirmation of what they already believe!"
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Why? What can the .240 Wby do that the .25-06 can't? The older I get, the more practical and logical I become... What advantages does the .240 Wby have? You can shoot a 100 gr. bullet at the same speed or faster out of the .25/06. Re: the latest Hornady manual, top velocity for the .240 Wby with 100 gr. bullet; is 3200 f.p.s. The .25/06 gets 3300 f.p.s. Top velocity for 75 gr. bullets in the .25/06 is: 3700 f.p.s. The .240 only does 3500 f.p.s. True, you get a slightly better ballistic Co-efficient with the .240 Wby, but that really comes into play well beyond 300 yds... Plus, another advantage to a .25/06; is that you can shoot 115-120 gr. bullets... But if a .240 Wby scratches your itch, then: Go for it... Nothing is worse that "settling" for one chambering when you WANT another... GH Load data is always watered down for the Weatherby's. I should be able to achieve 3400 fps without too much issue shooting the 100 -105's. Run the numbers using a .500 bc . 6mm bullet at 3400fps and then compare it to a .25 cal, 100 gr bullet at 3300 and you'll understand my interest in a fast 6mm..especially beyond 500 yards. No flys at all on the 25-06. If I didn't have a 257 wby, I wouldn't even waste my time on a fast 6. I'd be totally content with a 25-06.
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Your idea is a little crazy, but since you recognize it, its not you that is crazy. Get the 240! Funny how few here are willing to answer the question you actually asked. Everybody wants to advise you. Human nature. Good luck.
Check with bullet mfgrs re twist. You may need 7.5 for the 105 & 115's.
Last edited by RinB; 10/25/12.
“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Posted by Brad.
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Campfire Outfitter
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Why? What can the .240 Wby do that the .25-06 can't? The older I get, the more practical and logical I become... What advantages does the .240 Wby have? You can shoot a 100 gr. bullet at the same speed or faster out of the .25/06. Re: the latest Hornady manual, top velocity for the .240 Wby with 100 gr. bullet; is 3200 f.p.s. The .25/06 gets 3300 f.p.s. Top velocity for 75 gr. bullets in the .25/06 is: 3700 f.p.s. The .240 only does 3500 f.p.s. True, you get a slightly better ballistic Co-efficient with the .240 Wby, but that really comes into play well beyond 300 yds... Plus, another advantage to a .25/06; is that you can shoot 115-120 gr. bullets... But if a .240 Wby scratches your itch, then: Go for it... Nothing is worse that "settling" for one chambering when you WANT another... GH Load data is always watered down for the Weatherby's. I should be able to achieve 3400 fps without too much issue shooting the 100 -105's. Run the numbers using a .500 bc . 6mm bullet at 3400fps and then compare it to a .25 cal, 100 gr bullet at 3300 and you'll understand my interest in a fast 6mm..especially beyond 500 yards. No flys at all on the 25-06. If I didn't have a 257 wby, I wouldn't even waste my time on a fast 6. I'd be totally content with a 25-06. The 25-06 will beat the 240 Weatherby with like weight bullets, at similar pressures. Same case capacity, bigger bore. Also, to get that .5 BC you will be running Amaxes or Bergers. If you prefer heavier jacketed, more controlled expansion bullets, you will be looking at only slightly better BC numbers on the 6mm versus 25, which will be a wash due to the added velocity of the 25. If you want to do it, go for it. Will it make one iota of difference in the field? No.
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Campfire 'Bwana
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Campfire 'Bwana
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Your idea is a little crazy, but since you recognize it, its not you that is crazy. Get the 240! Funny how few here are willing to answer the question you actually asked. Everybody wants to advise you. Human nature. Good luck.
Check with bullet mfgrs re twist. You may need 7.5 for the 105 & 115's. +1 Some of this sounds like loonies lecturing a loony on loonism...  OP already has a .25 cal, so go for something different. I would go with a faster than std. twist if I was building a .240 or a 6-06. My .240 is a std. 10 twist and seems to shoot bullets in the 85 gr. range the best. I wish it liked 100+ gr bullets. DF
Last edited by Dirtfarmer; 10/25/12.
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7.5 or 8" twist is the way to go, depending on whether you want to sling 115', or just 105's.
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