300 or 340 weatherby?

No offense, but that is utter BS!
None of my loads even come close to 70k. I have never seized an action or had hard bolt lift either.
Click to expand...

What equipment have you used to measure the chamber pressure in order to be so sure that they never even came close to 70k?

People that have actually used the RSI pressure trace system,or the Oehler M43 system have stated that in many guns,visible pressure signs such as brass extrusion or increased resistance on bolt lift aren't at all apparent until the chamber pressure exceeds 70,000 to 75,000 psi.
 
stubblejumper said:
What equipment have you used to measure the chamber pressure in order to be so sure that they never even came close to 70k?

People that have actually used the RSI pressure trace system,or the Oehler M43 system have stated that in many guns,visible pressure signs such as brass extrusion or increased resistance on bolt lift aren't at all apparent until the chamber pressure exceeds 70,000 to 75,000 psi.
Click to expand...

Do you have pressure testing equipment??


Here are published data from Weatherby, developed by Norma:

.340 Weatherby
Bullet.: 250grs
Powder.: Norma MRP
Weight.: 88,0grs
Primer.: Federal 215
MV.: 3000fps
Pressure 53,500 PSI

Contact Norma if you dispute this data.
 
stubblejumper said:
What equipment have you used to measure the chamber pressure in order to be so sure that they never even came close to 70k?

People that have actually used the RSI pressure trace system,or the Oehler M43 system have stated that in many guns,visible pressure signs such as brass extrusion or increased resistance on bolt lift aren't at all apparent until the chamber pressure exceeds 70,000 to 75,000 psi.
Click to expand...

I think some reloaders are approaching these kinds of pressures trying to duplicate Weatherby published velocity's. I agree with .444 shooter I don't think Norma is loading this hot. Keep in mind Ammunition manufacturers have proprietary blends of non commercial powders that you and I don't have access to. Hornady is famous for doing this, and even Federal in theit "High Energy" line of ammunition.
 
My father has a 300 WBY & my Father-In-Law has a couple 340 WBY's. One is 24" & one is 26". There is 40-50 FPS difference between the 2 340 rifles. Bot will launch a 250gr Speer GS over the 2900 FPS mark with ease.
I have not tested Dad's 300 WBY that much, but I am sure a 200 gr would go over the 3000 FPS mark. I had a 300 Win Mag years ago that was in spitting distance of the 3000 FPS mark with 200gr Accubonds. ;)

If you are going to shoot bullets in the 225-250 range then a 340 is the ticket. If 180-200 is your range then the 300 gets the nod.

They are both very good rifles & will both do the job just fine.
 
Contact Norma if you dispute this data.
Click to expand...

Below is the data from Norma.Using the same components,they achieved a maximum of 2891fps with a 250gr bullet.

http://www.norma.cc/sortimentladd.asp?Kaliber=340 Weatherby Magnum&Lang=2

How old is your data?The old data used CUP as a pressure unit not PSI.They are not one and the same,and they are not interchangeable.

You aren't going to get 3000fps out of a 250gr bullet out of a 340wby with a 26" barrel, with a reduced load of only 53,500psi,when factory loads produce as much as 66,000psi

http://docs.google.com/viewer?a=v&q...zw78LY&sig=AHIEtbTUoM2TWshMeXN_Ybol-1VL_1CE9Q

Weatherby only claims 2963fps with full power loads,let alone a reduced load of only 53,500psi.

http://www.weatherby.com/product/am...mo2=.340+Wby.&compare=Compare&compare=Compare


I don't own pressure measuring gear myself,but then again I don't make claims as to the pressure that my loads are developing.
 
stubblejumper said:
Below is the data from Norma.Using the same components,they achieved a maximum of 2891fps with a 250gr bullet.

http://www.norma.cc/sortimentladd.asp?Kaliber=340 Weatherby Magnum&Lang=2

How old is your data?The old data used CUP as a pressure unit not PSI.They are not one and the same,and they are not interchangeable.

You aren't going to get 3000fps out of a 250gr bullet out of a 340wby with a 26" barrel, with a reduced load of only 53,500psi,when the SAAMI standard for that case is 65,000psi.

Weatherby only claims 2963fps with full power loads,let alone a reduced load of only 53,500psi.

http://www.weatherby.com/product/am...mo2=.340+Wby.&compare=Compare&compare=Compare


I don't own pressure measuring gear myself,but then again I don't make claims as to the pressure that my loads are developing.
Click to expand...

Provide me some pressure testing equipment, and I will gladly run my loads through it. I can easily achieve 2950fps with a 250gr in my stock Mk V 340Wby. The standard SAAMI pressure for Weatherby ammo is 55,000 CUP. There was a misprint in that load I posted, as it is in CUP, not PSI.

I have loaded Weatherby for almost 20yrs and all my ammo is safe and I am not some hot head that pushes things to the limit. And, I have been able to get MOA accuracy too...unlike some people ;)

Here are some REAL loads from my rifles

.270Wby

130gr Nosler Ballistic Tip
RL-22 73grs
Wby case
Fed #215
3.290"
3323fps

Rifle was a Vanguard Classic II with 24" barrel

.300Wby

180gr Hornady SP
RL22 85grs
Wby
Fed #215
3.560"
3233fps

Rifle was a Mk V Lazermark with 26" barrel
 
There was a misprint in that load I posted, as it is in CUP, not PSI.
Click to expand...

And what do you suppose a 55,000CUP load would produce in PSI?
Take a look below at the SAAMI rating for the 300WBY.

http://www.ramshot.com/powders/loadpressure.php

http://kwk.us/pressures.html

Notice that the SAAMI rating for the 300wby is 65,000psi which is not far off 70,000psi.At 65,000psi,I wouldn't say that you are nowhere near 70,000psi.

Do you know why is there no SAAMI rating for the 340wby in the charts?

It is explained below where it also states that factory 340WBY loads produced 66,000psi which is getting even closer to 70,000psi.If you add another grain or two to reach 3000fps with that 250gr bullet,as per the data that you posted,you are in 70,000psi territory.And you might not even even lock up an action,or feel a lot of resistance on bolt lift.

http://docs.google.com/viewer?a=v&q...zw78LY&sig=AHIEtbTUoM2TWshMeXN_Ybol-1VL_1CE9Q
 
444,at 70,000,you shouldn't have hard bolt lift unless your bolt face is a fair bit off of square. What I'm saying is,I would trust latest Nosler numbers a lot more than old Weatherby.Anyone with a laptop can now buy and use a Pressure Trace for the cost of a good scope.
 
As long as you have good case life who cares what the pressure is. Just for the record my favorite load for the 300 when I used it was a 200 Nosler at 3100. Cases were fine. Just a tip, the 300 dosen't need the slowest powders to work at this speed. In the 340 I would get 3100 the 225s but never quite 3000 outa 250s. Very close though.
 
I don't see much difference between the Weatherby calibers and any of the RUMs. They all are listed at 65,000psi. And yes, the 340 is no different.

People that actually own and have loaded for these calibers know the performance, and know their limits.

I am actually going to purchase the RSI lab software and pressure testing equipment soon. It would be handy to help dispel some myths ;)
 
444shooter said:
Do you have pressure testing equipment??


Here are published data from Weatherby, developed by Norma:

.340 Weatherby
Bullet.: 250grs
Powder.: Norma MRP
Weight.: 88,0grs
Primer.: Federal 215
MV.: 3000fps
Pressure 53,500 PSI

Contact Norma if you dispute this data.
Click to expand...

That is very old and very hot data....There is no way the 340 can push a 250 grainer to 3000 fps with only 53500psi.
I remember the late great Bob Hagel quoting such nonsense...He and Ken Waters later recanted a great many (recommended) loads.

You are much safer at 2900 IMHO.
 
I don't see much difference between the Weatherby calibers and any of the RUMs. They all are listed at 65,000psi. And yes, the 340 is no different.
Click to expand...

Most have a SAAMI rating of 65000 psi,but in factory loads,the Weatherby brand loads are usually in the 65,000psi range, with the Remington loads being noticeably less.

People that actually own and have loaded for these calibers know the performance, and know their limits.
Click to expand...

Since most handloaders don't own pressure measuring equipment,they have no way of knowing what chamber pressure their guns are developing with a given load.
 
+1 for the 340, I couldn't get it in the rifle I wanted so I wound up with a 338WM.
Looking at the mag box though I imagine it could be opened up...
 
You must log in or register to reply here.
Back
Top Bottom