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

 
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  #15  
Old 02-17-2002, 02:17 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

Brent,
I just laid out my 338 Lapua case from a sectioned case I have out of my chamber. Moved the shoulder foward another .015", left the taper alone as they extract very nicely even when hot load are fired. Depending on whether you want a 35 degree or go to the 40 degree shoulder you could end up between 123-125gr of H2O approx.

So to review what is already known: My current case holds 120.5gr of H2O. Has produced 3165fps in a 45" barrel with R25 (in one rifle!!) with a 96gr load accurately. This 45" barreled rifle and mine have both fired up to 98gr of R25 but it was on the hot side in summer time temps. Don't have the chrono numbers for the 98gr load though.

So if you use slower burning powders with the current case or any amount of case capacity increase you should be able to get 3200fps easily in a long barrel. How much over 3200fps would be guessing.
But Darryl has a point about 5-7 firings of 100 cases. Are you going to be able to push 3300fps with the Lapua case, I'd say that's probably stretching it, but you never know. You've got my curiousity up. Wish I was in the position to do this myself just to see.

Steve
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  #16  
Old 02-17-2002, 02:42 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

Brent and Steve

Marck Chapic has a 338/416 Imp with a BAT action and 40" barrel and I was there the day he took it to 3350 FPS using the 300 gr bullet with NO pressure signs what so ever.

I even opened the bolt on one of the fired cases to see if there was any sticking----None was present. He could have pushed it faster but, stopped there.

I doubt if a lessor volumn case would be able to do it. If he would have had a 44" barrel he could possibly have added another 100 to 125 fps to that velocity.
He was using an Oehler chronagraph for his printouts that day.

As I have stated before ---I have run mine to 3310 FPS at the expense of brass and that's in a 37" barrel. Had I had a 44" instead, my velocity would be WAY up there---Probably 3400 or more?

Just added information.
Darryl
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  #17  
Old 11-28-2013, 10:11 PM
922 922 is offline
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by Brent View Post
... and a case of Darryls 338/416 Imp that was 134gr water.
You can show the photos of this cartridge ?
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  #18  
Old 11-28-2013, 10:51 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

You do realize that this thread is over 11 years old right?
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Old 11-28-2013, 11:20 PM
922 922 is offline
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by MudRunner2005 View Post
You do realize that this thread is over 11 years old right?
I'm sorry Оthers can help me ?
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  #20  
Old 11-28-2013, 11:45 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

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Originally Posted by 922 View Post
I'm sorry Оthers can help me ?
It's ok, no need to appologise, I was just letting you know this was a really old thread and might not be of much help. I should have worded my post different earlier.

I'm sure there's plenty of others on here who can help you, if you are looking for something like in the original post.

If you are looking for large magnum calibers, contact Kirby Allen.
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"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger

"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

Ignore everything I say, because I have a reading comprehension and memory problem...

Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #21  
Old 11-29-2013, 03:27 PM
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Re: New .338 lanches a 300gr Sierra MK at 3500fps?

The 338-416 wildcats were pushed VERY hard back in the late 90s, early 00's to get some impressive numbers. Unfortunately, by their own admission, their brass life was only 1 or 2 firings at this level. To me that is not practical or even SAFE!!!

Since then, there have been a host of 338 magnums based on the 408 Cheytac parent case ranging from the standard 338-408 CT up to my 338 Allen Magnum with several in between. With a 300 gr SMK, these wildcats produce 3200 fps to 3450 fps depending on chambering and barrel length with good chamber pressures. By that I mean getting AT LEAST 6 firings per case.

3500 fps with a 300 gr SMK, that's pushing it off a Cheytac based wildcat. The 300 gr Berger is abit faster and would get you closer but in reality, there is no need. When you can get +3300 fps with a 338 cal 300 gr berger, that shoots lights out and hits like a mac truck, there is not a lot better out there in a system that is consistant over a wide range of bore diameters and barrel lengths.

This combo will do MUCH more then most of us will ever use in the field and offers us reach that again, most of us SHOULD never attempt on live game but we are already there and have been for many years.

The next step up in performance will likely not come in 338 caliber but in 375 cal when we get new, better bullets on the market to exploit the advantages of the slightly larger caliber. Get better barrel life with same ballistic performance now. With better bullets, I believe the 375 will become the ultimate bore diameter in the cheytac class case capacity range.
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