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New .338 lanches a 300gr Sierra MK at 3500fps?

 
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  #36  
Old 11-30-2013, 09:12 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by Fiftydriver View Post

I am not a fan of solids.
+1, There are definitely some monoís with sleek design but lack the sectional density to compete in the BC arena with the heavier lead bullets of same weight. If monoís were so great they would be ruling the 30 and 338 world right now. I donít believe this is the case. 375 world yep and only likely by the lack of manufactures producing new products. Iím sure this will change with time. I would love to be a bug on the wall when a programmer designs a bullet matching form factor with weight (sectional density) based off a caliber.

It would be interesting if bullet manufacturers have considered tungsten as the base material? Cost/benefit for production? When pushed to lead free waterfowl shot this process took off along with the cost of $s to the consumer.
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  #37  
Old 11-30-2013, 09:27 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by MMERSS View Post
+1, There are definitely some monoís with sleek design but lack the sectional density to compete in the BC arena with the heavier lead bullets of same weight. If monoís were so great they would be ruling the 30 and 338 world right now. I donít believe this is the case. 375 world yep and only likely by the lack of manufactures producing new products. Iím sure this will change with time. I would love to be a bug on the wall when a programmer designs a bullet matching form factor with weight (sectional density) based off a caliber.

It would be interesting if bullet manufacturers have considered tungsten as the base material? Cost/benefit for production? When pushed to lead free waterfowl shot this process took off along with the cost of $s to the consumer.
I think there are problems with the bigger calibres, making the jackets thin enough for adequate terminal performance yet still survive the launch velocity/pressure, especially with the faster twists required for the heavy higher BC projectiles

I'm sure we can all remember the first Berger 300 grain 338s....
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  #38  
Old 11-30-2013, 10:00 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by Kiwi Greg View Post
I think there are problems with the bigger calibres, making the jackets thin enough for adequate terminal performance yet still survive the launch velocity/pressure, especially with the faster twists required for the heavy higher BC projectiles

I'm sure we can all remember the first Berger 300 grain 338s....

True, with an additional manufacturing process or two proper nose design can be incorporated to assist with expansion and accommodate the desired results of hunting bullet terminal performance. All of this will come with a cost but when considering large calibers and case capacity with hunting platforms cost sometimes is not a predominant consideration with the consumer. We will spend thousands on a gun, scope, range finder, gas, reloading equipment, etc. What's an extra $.30 per round if manufactured correctly to ensure proper expansion yet have thick enough jackets to prevent failure? Those shooting mono's in large calibers are already paying high prices for the rounds.
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  #39  
Old 11-30-2013, 10:17 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

I do have 338/416 Rigby Imp that Darryl Cassel gave me many years ago. I'll post a picture soon, just for comparison.

If I were me, I'd chose 338 Raptor over 338/416 Rigby Imp due to quality of brass.

Darryl's friend shot an elk close to 2800 yards with 338/416 Imp long time ago.
Darryl shot an elk around 2100 yards with this caliber.
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  #40  
Old 12-01-2013, 04:09 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

338/416 Rigby Imp: Neck down and shoulder up. Remington brass is really soft and cheap. Throw out every two rounds if the load is hot.

338 Tomahawk: What is it? Very similar to 338 EDGE but a bit faster. It is based on 300RUM but bump the shoulder to 35 deg and wider. (less taper).
Attached Thumbnails - Click to View Larger
New .338 lanches a 300gr Sierra MK at 3500fps?-338_416rigbyimp_338tomahawk_6_5x284_6br.jpg   New .338 lanches a 300gr Sierra MK at 3500fps?-338_416rigbyimp_300rum.jpg  

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  #41  
Old 12-01-2013, 04:41 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by Erik Kiser View Post
What could one expect from an improved 375 RUM case with a 350-370 gr bullet or would it be better to start with a 378 Weatherby case. I'm just thinking what is possible without going all the way to the Cheytac case. As you know an RUM case would allow a M 700 action, is 3000 fps possible using an improved RUM case and a 350 gr bullet with a shorter bearing surface(Berger'ish)
In my testing comparing the 338 cal 300 gr SMK to the 375 cal 350 gr SMK in both my 338 Allen Xpress, 338 Allen Magnum, 375 Allen Xpress, 375 Allen Magnum. The 338 calibers will drive a 300 gr SMK roughly 50 fps faster then the same case capacity but with the 375 cal driving the 350 gr bullet weight.

The 350 gr SMK has a relatively short baring surface compared to the 338 300 gr SMK so I do not really see the baring surface being shortened all that much if Berger makes one, especially if bullet weight is increased to the 370-380 gr range.

The 375 AX will get 3000-3050 fps pretty comfortably in a 30" barrel length. Now that is on average, some will run a bit more, some a bit less. Now, a 375 RUM Improved has a case capacity roughly right between a standard 375-338 Lapua and my 375 Allen Xpress so I would say absolute max velocity with the 375 RUM Improved would be in the 2950-2975 fps range with 350 gr SMK. With a 370 gr bullet weight, I would say 75-100 fps slower.

Now, keep in mind how long we all were playing with the standard 338 Edge driving a 300 gr SMK to 2850 fps and it killed a hell of a lot of big game at some very long ranges.

IF we get a bullet with at least the same BC as the 300 gr SMK which should be easy to do, add in the larger bullet diameter, higher kenetic energy payload and in a bullet that expands reliably, the 375 cal will be a far superior bullet for long range big game hunting.

Basically it all comes down to getting a bullet with BC at least into the G1 +.8 range with a design that will allow top speed for bullet weight and also expand reliably.......
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  #42  
Old 12-01-2013, 04:52 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

Quote:
Originally Posted by Fiftydriver View Post
In my testing comparing the 338 cal 300 gr SMK to the 375 cal 350 gr SMK in both my 338 Allen Xpress, 338 Allen Magnum, 375 Allen Xpress, 375 Allen Magnum. The 338 calibers will drive a 300 gr SMK roughly 50 fps faster then the same case capacity but with the 375 cal driving the 350 gr bullet weight.

The 350 gr SMK has a relatively short baring surface compared to the 338 300 gr SMK so I do not really see the baring surface being shortened all that much if Berger makes one, especially if bullet weight is increased to the 370-380 gr range.

The 375 AX will get 3000-3050 fps pretty comfortably in a 30" barrel length. Now that is on average, some will run a bit more, some a bit less. Now, a 375 RUM Improved has a case capacity roughly right between a standard 375-338 Lapua and my 375 Allen Xpress so I would say absolute max velocity with the 375 RUM Improved would be in the 2950-2975 fps range with 350 gr SMK. With a 370 gr bullet weight, I would say 75-100 fps slower.

Now, keep in mind how long we all were playing with the standard 338 Edge driving a 300 gr SMK to 2850 fps and it killed a hell of a lot of big game at some very long ranges.

IF we get a bullet with at least the same BC as the 300 gr SMK which should be easy to do, add in the larger bullet diameter, higher kenetic energy payload and in a bullet that expands reliably, the 375 cal will be a far superior bullet for long range big game hunting.

Basically it all comes down to getting a bullet with BC at least into the G1 +.8 range with a design that will allow top speed for bullet weight and also expand reliably.......
Extremely well put Kirby
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