RE: 338 Ultra-mag why isn't it more popular?
 

Just for fun, and to be "completely different", as Monte Python's Flying Circus used to say, how about a return to the original thread? (Urination contests about Roy vs. Rem can go on forever since neither side is willing to concede their dearly held opinions) Why isn't the .338 Ultra Mag more popular? Because for 99% of the hunting in the good old USA, it is much more than is required, it kicks too hard for most shooters, it is expensive to shoot, and there are other calibers more firmly entrenched that cover the same limited ground. I settled on a .270 Winchester Short Magnum for my all purpose hunting rifle and was concerned that it might recoil more than I wanted. Fortunately, it is fine for a recoil sensitive pantywaist like me. (Embarrassing to admit for a 50 year old guy who is 6'3" and 215 lbs)
As for muzzle breaks, if you need a muzzle break, get a smaller gun. Your hearing is more important than your macho image, and others on the range will appreciate mature males who are confident enough in their manhood to admit that they don't enjoy the pain inflicted by excessive recoil. I already have suffered over 90% hearing loss in one ear courtesy of an inner ear virus and don't want to jeopardize my good ear. (I have always worn plugs and muffs together on the range, so don't blame the shooting)
But if you want to shoot a .338 Rem Ultra Mag, please be my guest. Remington will thank you and I guess if that is what you want, then that is what you can have. But for me and over 98% of the rest of us. We just don't care for it.

RE: 338 Ultra-mag why isn't it more popular?
 

Bigcountry:

That 7mm RUM Shoots .666" 3 shot groups at 100 yds., it dosen't sound defective to me.

No, I do not own a .300 Wby Mag. If you read my posts carefully you will find the answer to your question.

Every rifle is different some like being close to rifling, and some don't. Weatherby Mags. are made to at least shoot 1.5" three shot groups at 100 yds. with Weatherby Ammo due to case design, powder, and freebore. The system Roy Weatherby assembled works, and that is all there is to it.

Good luck.

RE: 338 Ultra-mag why isn't it more popular?
 

Stubblejumper:

I have been a Automotive and Diesel Tech. since 1983, and the venturi system in carburetors has been around way before 1983. Carburetors work very well with the venturi system, and so do Weatherby Magnums. Do some research on the venturi principle; you might learn somthing. I don't remember about the gadget you are talking about.

You fill a Weatherby Magnum Case (exempting the .30-378 Wby. Mag., and .338-378 Wby. Mag.) with Retumbo or RL-25, and that rifle will not reach the velocities you will with Norma MRP. With the .30-378 Wby. Mag., and .338-378 Wby. Mag. Norma MRP-2 is the powder to use. Try it and see.

I don't understand your third point.

All my points hold water your just too stubborn to see it.

Good luck.

RE: 338 Ultra-mag why isn't it more popular?
 

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RE: 338 Ultra-mag why isn't it more popular?
 

yeah, but how MUCH water????? and what kind??? distilled, tap, or spring? if you wanna make claims of water on this site you'd better have the data to back it up!!!! :D:D:D

RE: 338 Ultra-mag why isn't it more popular?
 

I have been a mechanical engineering technologist since 1980 and I do understand the function of the venturi system in a carburetor.However the venturi system in carburetors and the daul radius shoulders of the weatherby cartridges are not in fact the same and do not serve the same purpose.

Actually there were several of them which you don't remember for the simple reason that they didn't live up to their claims.

You are still missing the point that you could load the ultramag cartridges with the same MRP.If the MRP really does produce more velocity with the weatherby cartridges,it will produce more velocity with the ultramag cartridsges.

First you use the freebore as a reason that the weatherby rifles produce more velocity than other rifles.You then state that the ultramag rifles have as much freebore as the weatherby rifles.If as you say both have the same freebore then freebore is not an advantage to either.

RE: 338 Ultra-mag why isn't it more popular?
 

Ok, here is where I quit talking to you. I mean no offense really. But will say this, have you ever tried to get weatherby to fix a rifle that didn't shoot 1.5". Lets say, I won't try it again. I would just sell and buy another one. Yes, I have been down that road. Wasting your time.

Two, if it has more freebore than a weatherby, then yes it is out of spec. I never saw it shot so I can't say it does shoot .666 (you really measured it to the thousandth???, that should tell us all something about you). RUM's were never meant to have that much freebore. (That should also tell us something about you) After your last few posts man, I just can't discuss this with you anymore. You and stubble can have it out. And you can have fun with your wild freebored RUM's.

RE: 338 Ultra-mag why isn't it more popular?
 

ok Big Boy.........deep breaths........calm down...... think of a happy place......think of what you did this past weekend, you wouldnt want to ruin that by giving out your address again would you??? :):)

RE: 338 Ultra-mag why isn't it more popular?
 

Actually,I have come to the same conclusion and have no interest in continuing this thread.

RE: 338 Ultra-mag why isn't it more popular?
 

Stubblejumper:



This image is out of my Calc. Physics Book which showes you how Bernoulli's Principle works. Does it not look like a Weatherby Magnum Case.
Here are some more examples: http://www.mste.uiuc.edu/TCD/Aerodyn...es/Day2_3.html (scroll down)
http://hyperphysics.phy-astr.gsu.edu/hbase/pber.html
http://www.aviation-history.com/theory/airfoil.htm (scroll down)

This is why Weatherby uses "A Unique Double Radius Venturi Shoulder Design increases the velocity of escaping gases without increasing the pressure within the cartridge. This results in higher velocities within standard pressure ranges." (Source: Weatherby 2005 Catalog)

According to Norma the .338 RUM pushes a 225 gr. bullet using MRP Max. 90.4 grs. Vel. 3064 f/s.
According to Norma the .340 Wby. Mag. pushes a 225 gr. bullet using MRP Max. 92.4 grs. Vel. 3117 f/s.

The reason MRP will not create the velocities in the RUM's and .30-378 Wby. Mag. and .338-378 Wby. Mag. is because they are extream overboars, and MRP was not created for these very large cases. Norma MRP-2 was created for these large cases resulting in very good velocties.

The .338 RUM pushes a 225 gr. bullet using Norma MRP-2 Max. 98.3 grs. 3110 f/s.

The .338 RUM pushes a 225 gr. bullet using Retumbo Max. 103 grs. 3055 f/s.

The .338 RUM needs MRP-2 to reach their potential at this time; it cannot reach its potential using MRP like the .340 Wby. Mag. The .340 Wby. Mag. has reached its potential using freebore, the double radius shoulder, and Norma MRP.

I said a 7mm RUM I loaded for had more freebore than my .340 Wby. Mag. I never said all RUMS and Wby. Mags. have the same length of freebore. If it was not for freebore, the RUM's and Wby. Mags. would not reach their velocities they are known for. Freebore reduces pressure.

Good luck.