King of 270's for 63 years

[bullet]

King of 270's for 63 years.
In 1943 Roy first designed the .270 Weatherby Magnum, which went commercial a few years later. The .270 Weatherby is based on a blown-out .300 H&H Magnum case shortened to fit standard (.30-06) length actions. Roy must of thought that it was important and so this was his first. The 270Wby became the first in a long line of fine cartridges. The .270 Weatherby does not have any real competition in the factory cartridge category. Not even the short magnums can do what the 270Wby can in velocity and energy even though the short magnums use relatively high pressures by blending powders that are not available to handloaders. I hunted with a 270Win for over 10 years and it really was effective on game. The .270 Weatherby is 300 plus feet faster than this classic. It kicks less than the 7mm Weatherby Magnum and much less than the 300 Weatherby. It really is a cool cartridge that Roy came up with and when one considers the powders of today, along with a big assortment of bullet designs and weights to choose from, the 270Wby really shines. The 270Wby can do a lot of the work that the 300Wby and 257Wby’s are known for and you have it in one rifle allowing it to be a very versatile cartridge. The 300Wby is the most popular, with the 257Wby just behind it in second place. The 270Wby is an over looked cartridge, but it truly is a cool hot rod and shoots flat. The .277 caliber has been a favorite of some important people in the history of modern firearm development and Roy Weatherby was one of them. He gave us a .277 that is still on top after 63 years of being the king of 270’s and still is king. You put it in a Mark V and it really becomes something special. Roy Weatherby understood so much and it takes some people a life time to finally begin to get a handle on what he new and believed. Yes, the 270 Weatherby Magnum is a special cartridge. It was his first born.

I like the .277 cal and so did Jack O'Conor, Roy and others. I am looking forward to shooting my 270-300Wby. With a 150gr bullet I will be getting between 3700-3750fps and that will give me 4550-4680ft pounds of energy and with a tough bullet like the TSX, that will be bad news, just plain bad news while a very flat trajectory. The 150gr bullet gives me a greater coefficient than a 180gr .30 cal bullet. For example the 150gr X bullet is .591" while the 180gr X bullet is .511". This will be one great cartridge and it will be a real go to cartridge for what ever I hunt.

 

[JD338]

bullet,

Very cool. 3700 fps is a good jump up in performance.
What barrel length are you considering?

JD338

 

[bullet]

That will be out of a 26" barrel. I do not like to tote around the mountains with anything longer. These velocities have already been achieved in a 26" barrel in a friend of mines 270-300Wby.

 

[JD338]

bullet,

I have a couple of 26" tubes so I hear ya on maneuverability.
The 150 gr PT or TSX at 3700 fps is some serious horsepower.:grin:
Keep us posted on your project and post some pictures.

JD338

 

[bullet]

bullet,

I have a couple of 26" tubes so I hear ya on maneuverability.
The 150 gr PT or TSX at 3700 fps is some serious horsepower.:grin:
Keep us posted on your project and post some pictures.

JD338

Here is the B&C Metalist stock that my gunsmiths daughter is holding. I am choosing the desert color because my rifle will be a flat black and I will use this out west for the most part.

 

[bullet]

bullet,

I have a couple of 26" tubes so I hear ya on maneuverability.
The 150 gr PT or TSX at 3700 fps is some serious horsepower.:grin:
Keep us posted on your project and post some pictures.

JD338

JD338, to put things in perspective when using a 150gr in the 270-300Wby and a 180gr bullet in the 300Wby of the same make and brand, the following trajectory and energy is interesting. Of course this is only for a sense of things by comparison not some debate or a box full of opinions. Just thought this was interesting

270-300Wby 150gr moving 3700fps with 2.5 sight in at 100yds
-3.71" at 400yds

300Wby 180gr moving 3287fps with 2.5 sight in at 100yds
-9.33" at 400yds

270-300Wby 150gr bullet energy
2969 at 400yds
2657 at 500yds
2373 at 600yds

300Wby 180gr bullet energy
2580 at 400yds
2249 at 500yds
1953 at 600yds

If I can get anywhere near this with good hunting accuracy, this will be one serious rifle and cartridge.
__________________

 

[JD338]

bullet,

Serious is right, it would be a flat liner for sure.
Here is a good link, go to the advanced ballistic calculator.
http://www.biggameinfo.com/
Nice looking stock too. :wink:

JD338

 

[nomosendero]

King of 270's for 63 years.
In 1943 Roy first designed the .270 Weatherby Magnum, which went commercial a few years later. The .270 Weatherby is based on a blown-out .300 H&H Magnum case shortened to fit standard (.30-06) length actions. Roy must of thought that it was important and so this was his first. The 270Wby became the first in a long line of fine cartridges. The .270 Weatherby does not have any real competition in the factory cartridge category. Not even the short magnums can do what the 270Wby can in velocity and energy even though the short magnums use relatively high pressures by blending powders that are not available to handloaders. I hunted with a 270Win for over 10 years and it really was effective on game. The .270 Weatherby is 300 plus feet faster than this classic. It kicks less than the 7mm Weatherby Magnum and much less than the 300 Weatherby. It really is a cool cartridge that Roy came up with and when one considers the powders of today, along with a big assortment of bullet designs and weights to choose from, the 270Wby really shines. The 270Wby can do a lot of the work that the 300Wby and 257Wby’s are known for and you have it in one rifle allowing it to be a very versatile cartridge. The 300Wby is the most popular, with the 257Wby just behind it in second place. The 270Wby is an over looked cartridge, but it truly is a cool hot rod and shoots flat. The .277 caliber has been a favorite of some important people in the history of modern firearm development and Roy Weatherby was one of them. He gave us a .277 that is still on top after 63 years of being the king of 270’s and still is king. You put it in a Mark V and it really becomes something special. Roy Weatherby understood so much and it takes some people a life time to finally begin to get a handle on what he new and believed. Yes, the 270 Weatherby Magnum is a special cartridge. It was his first born.

I like the .277 cal and so did Jack O'Conor, Roy and others. I am looking forward to shooting my 270-300Wby. With a 150gr bullet I will be getting between 3700-3750fps and that will give me 4550-4680ft pounds of energy and with a tough bullet like the TSX, that will be bad news, just plain bad news while a very flat trajectory. The 150gr bullet gives me a greater coefficient than a 180gr .30 cal bullet. For example the 150gr X bullet is .591" while the 180gr X bullet is .511". This will be one great cartridge and it will be a real go to cartridge for what ever I hunt.

This is exciting & I have no doubt the round will meet your expectations. I
would however look at the TSX again. Barnes has redone the BC ratings of the TSX bullets after it was discovered the bands reduce the BC due to resistance & the #'s were way overrated. I would take a look at the 140Accubond with the rating of .496, that is pretty salty for a 140gr. & matches the BC of the 150BT.

Good luck with this project & please keep us informed.

 

[bullet]

King of 270's for 63 years.
In 1943 Roy first designed the .270 Weatherby Magnum, which went commercial a few years later. The .270 Weatherby is based on a blown-out .300 H&H Magnum case shortened to fit standard (.30-06) length actions. Roy must of thought that it was important and so this was his first. The 270Wby became the first in a long line of fine cartridges. The .270 Weatherby does not have any real competition in the factory cartridge category. Not even the short magnums can do what the 270Wby can in velocity and energy even though the short magnums use relatively high pressures by blending powders that are not available to handloaders. I hunted with a 270Win for over 10 years and it really was effective on game. The .270 Weatherby is 300 plus feet faster than this classic. It kicks less than the 7mm Weatherby Magnum and much less than the 300 Weatherby. It really is a cool cartridge that Roy came up with and when one considers the powders of today, along with a big assortment of bullet designs and weights to choose from, the 270Wby really shines. The 270Wby can do a lot of the work that the 300Wby and 257Wby’s are known for and you have it in one rifle allowing it to be a very versatile cartridge. The 300Wby is the most popular, with the 257Wby just behind it in second place. The 270Wby is an over looked cartridge, but it truly is a cool hot rod and shoots flat. The .277 caliber has been a favorite of some important people in the history of modern firearm development and Roy Weatherby was one of them. He gave us a .277 that is still on top after 63 years of being the king of 270’s and still is king. You put it in a Mark V and it really becomes something special. Roy Weatherby understood so much and it takes some people a life time to finally begin to get a handle on what he new and believed. Yes, the 270 Weatherby Magnum is a special cartridge. It was his first born.

I like the .277 cal and so did Jack O'Conor, Roy and others. I am looking forward to shooting my 270-300Wby. With a 150gr bullet I will be getting between 3700-3750fps and that will give me 4550-4680ft pounds of energy and with a tough bullet like the TSX, that will be bad news, just plain bad news while a very flat trajectory. The 150gr bullet gives me a greater coefficient than a 180gr .30 cal bullet. For example the 150gr X bullet is .591" while the 180gr X bullet is .511". This will be one great cartridge and it will be a real go to cartridge for what ever I hunt.

This is exciting & I have no doubt the round will meet your expectations. I
would however look at the TSX again. Barnes has redone the BC ratings of the TSX bullets after it was discovered the bands reduce the BC due to resistance & the #'s were way overrated. I would take a look at the 140Accubond with the rating of .496, that is pretty salty for a 140gr. & matches the BC of the 150BT.

Good luck with this project & please keep us informed.

Yes, thank you, I am aware of that and my numbers were calculated on the X not the TSX. I have recalculated the 150gr TSX against the 150gr AccuBond and the TSX is sighted in at +2.5" at 100yds is -5.7" at 400yds and the AccuBond was -4" at 400yds so there is not all that much difference. Plus the AccuBond will not hold up on 100yds shots and in with these velocities. This has already been discovered with another 270-300Wby. The TSX, X, GS and like bullets are the only ones that will hold up on close shots and still open up on long ones. When the 140gr and 130gr is used which both are over 3800fps no other bullet but the TSX or GS 110HV should be used.

 

[Ol` Joe]

I am looking forward to shooting my 270-300Wby. With a 150gr bullet I will be getting between 3700-3750fps and that will give me 4550-4680ft pounds of energy and with a tough bullet like the TSX, that will be bad news, just plain bad news while a very flat trajectory.

Your velocities sound a bit opimistic.
They are 500 fps over the parent cartridge and still a few fps faster then a 300-378 Wtby with similar SD/wgt bullets. Normally one can get a faster vel with a larger bore and same wgt bullet at equal pressure, but the 300 Wtby tops at 3540 fps with 150gr bullets, and the 300-378 only reaches 3500 fps with 165gr slugs. Weatherby loads factory ammo to 65K psi and are among the hottest loads going. Please don`t risk yourself for an extra 100 fps if you appear to have trouble reaching it.
Do keep us informed of your results though. I`m truely interested in the project and hope it works as you desire. It`s definitly one of the more interesting to me wildcats I`ve heard of lately..

 

[GB300wm]

Wow Bullet, that things a smoker. I thought that I had the fastest 270 around. When Arnold arms was in business, I had a 270 Arnold mag built on a sako l461 action. That thing still is a tack driving laser beam. Its parent cartridge is a 300 win mag. The shoulder is improved to 30 degrees. I am driving 140 bt's at 3450fps and can get 3720 out of 100 grainers. I'm using 74 grns 7828 to drive the 140's.

 

[bullet]

I am looking forward to shooting my 270-300Wby. With a 150gr bullet I will be getting between 3700-3750fps and that will give me 4550-4680ft pounds of energy and with a tough bullet like the TSX, that will be bad news, just plain bad news while a very flat trajectory.

Your velocities sound a bit opimistic.
They are 500 fps over the parent cartridge and still a few fps faster then a 300-378 Wtby with similar SD/wgt bullets. Normally one can get a faster vel with a larger bore and same wgt bullet at equal pressure, but the 300 Wtby tops at 3540 fps with 150gr bullets, and the 300-378 only reaches 3500 fps with 165gr slugs. Weatherby loads factory ammo to 65K psi and are among the hottest loads going. Please don`t risk yourself for an extra 100 fps if you appear to have trouble reaching it.
Do keep us informed of your results though. I`m truely interested in the project and hope it works as you desire. It`s definitly one of the more interesting to me wildcats I`ve heard of lately..

These are optimistic and obtainable within pressures, they have already been obtained by my friend in his rifle and across a chrono with the 130gr and 150gr. I will for sure not go for a 100fps just to get somewhere because this thing is fast anyway without trying hard. I should be able later this spring to see where my rifle is shooting and certainly will report, velocity, accuracy and actual down range drop by shooting long distance shots to see where and what they are really doing.

 

[bullet]

Wow Bullet, that things a smoker. I thought that I had the fastest 270 around. When Arnold arms was in business, I had a 270 Arnold mag built on a sako l461 action. That thing still is a tack driving laser beam. Its parent cartridge is a 300 win mag. The shoulder is improved to 30 degrees. I am driving 140 bt's at 3450fps and can get 3720 out of 100 grainers. I'm using 74 grns 7828 to drive the 140's.

I will be using RL-25, Retumbo and IMR7828 as test powders to find the loads for this cartridge. 270 Arnold is a laser for sure.

 

[JD338]

bullet,

Serious is right, it would be a flat liner for sure.
Here is a good link, go to the advanced ballistic calculator.
http://www.biggameinfo.com/
Nice looking stock too. :wink:

JD338

Forgot to include the link. :x
http://www.biggameinfo.com/

JD338

 

[bullet]

Thanks JD338, that is a cool link. With my ballistics I can justify kills of game over 1000 pounds out to 200 yards and up close over 1700 pounds. This will be a real go to rifle with a lot of versatility in the field.