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Big 338 powders??

 
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  #15  
Old 01-15-2011, 01:01 PM
B23 B23 is offline
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Re: Big 338 powders??

Soooooo, if the 378Wby case is "HUGE" what do you call the 338-408?

Ginormous, Gigantic, Monstrous, Humongous, Gargantuan
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  #16  
Old 01-15-2011, 01:33 PM
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Re: Big 338 powders??

Enormous, heavy barrel burner! I'd still love to have one though!
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  #17  
Old 01-16-2011, 03:58 AM
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Re: Big 338 powders??

Quote:
Originally Posted by Long Time Long Ranger View Post
Enormous, heavy barrel burner! I'd still love to have one though!
Thats why I built a custom 416 Barrett over two years ago & tried 24N41, 20N29, 50BMG & US869 & settled on the 869 but the 50 BMG is nearly as good, without some of 869s gremlins.
I would like to build a 375 VM type rifle but the lack of suitable pills is what is holding me back for now, I had/have the same trouble with the 416 & have learnt maybe
The 416 is still heaps of fun though with 420-435 pills going 3250fps ish

I use the 338s to try & learn as much as I can without breaking the bank & they are more consistant
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  #18  
Old 01-16-2011, 09:27 AM
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Re: Big 338 powders??

I've got one of those ginourmous, monsterous 338AM's on order from Kirby, can't hardly stand the wait!!
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  #19  
Old 01-16-2011, 12:38 PM
B23 B23 is offline
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Re: Big 338 powders??

Oh ya, sureee, rub it in why don't ya. For now I can only dream of having a 338AM.

Funny thing is I've got one of those 338Lapua imp with their not so "HUGE" case and it will blow the doors off my Accumark 338-378 and it has that "HUGE" case. lol
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  #20  
Old 01-16-2011, 02:14 PM
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Re: Big 338 powders??

RDM416, Let us know how it shoots. I would love to have one of those some day.

Kiwi, that Barret sounds like a great long range elk rifle to me. I would love to smack one with a 420 grain bullet at 3250. I think that is when I would start doing the mile thing during cow elk season.

B23, During the 90's when the Lapua case came out me and several others tried every possible configuration of the Lapua imp. case trying to beat the old tried and true 338-378 wildcat that had set the standard for big 338's since the 70's. We could not do it. You might get a super fast lapua imp barrel and a super slow 338-378 barrel and make them equal. But on average the 338-378 wins that velocity battle every time. Not by much but a consistent 50-75 fps average with best accuracy loads and equal length barrels. Negligible but neither is going to blow the doors off the other. Bottom line it is much safer to load down the 338-378 wby to shoot right with a maxed out 338 lapua imp. The Accumark has a 26" barrel. What barrel length is your Lapua imp? The 338-378 wby I hunt with most has a 28" Hart Barrel on it and the best accuracy load is 3064 fps with H-870 powder and a 300 smk. The 338 Lapua imp versions we tested all hit 2950-3000 fps with 30" barrels with safe pressure loads. You may have a very slow 338-378 and a very fast lapua imp. But still at that neither is going to blow the doors off the other. Or the barrel lengths are different. What are your velocities in each? The 338 Lapua Imp is one of my favorite cartridges but it will not blow the doors off a 338-378 wby all else being equal.
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  #21  
Old 05-25-2013, 07:31 AM
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Re: Big 338 powders??

Loading for the 338-378 Weatherby has changed alot over the past 2 years. With todays new powders one can upload todays new bullets to higher velocitys and accuracy than back in wildcat era. H570 and rl33 really changed the game with todays new high BC pills. the 300 gr accumark and 280 gr barnes pushed to 3100 fps in a freebored barrel is very safe and doable. NO LAPUA even if imp version can touch this safely. THis data that I just stated above is 26 in barrel!
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