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Load Data - 340 WBY

 
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  #8  
Old 07-12-2012, 07:56 PM
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Re: Load Data - 340 WBY

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Originally Posted by Long Time Long Ranger View Post
4831 and 4350 are to fast for the 340 wby. Look at a burn rate chart and choose something between 7828 and Retumbo. RE25, H1000, Magpro, etc. I can look up some loads for you from my rifles.
Any data you have would be great! Thanks.
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Old 07-13-2012, 12:23 PM
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Re: Load Data - 340 WBY

If you have 7828 that is a very good powder for the 340. Start with 85 grains with the 265 and work up. There will be about two grains difference between the 265 and the 285. A max load of 7828 should get you 2850 fps with the 265 grain. A slower powder like H-1000 would work better with the 285 grain but 7828 will do OK if that is what you have. Your max velocities should run about 125 fps slower than the 338-300 RUM. The 340 wby is a serious long range rifle that I have shot quite a bit for over 35 years.

Lefty, the 340 wby is far more rifle than your 338 winchester and requires much slower powders for best performance. RE-19 with 225 grain bullets in the 338 winchester at around 2900 fps is a very good max load for that cartridge. 4350 and 4831 are also good and will give you similar results. RE-19 is as slow as you can go with best loads in the 338 winchester and bullets in that weight range. That is where all my 338 winchesters shoot with best loads. By comparison my 340 wby's will all shoot the 225 grain bullets over 3100 fps with the slower burning powders far more effective.
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Old 07-13-2012, 12:52 PM
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Re: Load Data - 340 WBY

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Originally Posted by Long Time Long Ranger View Post

Lefty, the 340 wby is far more rifle than your 338 winchester and requires much slower powders for best performance. RE-19 with 225 grain bullets in the 338 winchester at around 2900 fps is a very good max load for that cartridge. 4350 and 4831 are also good and will give you similar results. RE-19 is as slow as you can go with best loads in the 338 winchester and bullets in that weight range. That is where all my 338 winchesters shoot with best loads. By comparison my 340 wby's will all shoot the 225 grain bullets over 3100 fps with the slower burning powders far more effective.
I've worked with 1/2 dozen 300 wins and a few 300 wby's and the wby's all had a heck of a time breaking 100 feet per second more than the 300 win. The 338 shouldn't be any different. I've got a 26" ruger #1 and I'm at mid load and slightly compressed running 2900 fps with a 225. I really don't feel like beating the rifle up so I won't push it. The 340 (and the 338U for that matter) just isn't different enough to worry about unless 300 grain pills are on the menu, and if then I'll use my 375. I've got a 300 win, a 300 U, and a 7mm stw for long range.

Last edited by Lefty7mmstw; 07-13-2012 at 01:05 PM. Reason: clarity
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  #11  
Old 07-13-2012, 01:07 PM
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Re: Load Data - 340 WBY

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Originally Posted by Long Time Long Ranger View Post
If you have 7828 that is a very good powder for the 340. Start with 85 grains with the 265 and work up..
+1


Great heavy bullet powder(7828). I use it in the 300win with 180-220 gr.
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  #12  
Old 07-13-2012, 01:37 PM
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Re: Load Data - 340 WBY

You are right about the 300 winny and 300 wby, less than 100 fps. The 340 wby is quite a bit different than the 338 winchester though since the 338 winchester is just a necked up 264 winchester/7mm remington to easily fit on the short '06 length actions. The 340 wby is a full length blown out 375 H&H case giving it 200+ fps more velocity. You are right where you need to be with your 338 winchester. Like I said your 2900 fps load of RE-19 is very popular and one of the better loads for the cartridge but is at max.
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  #13  
Old 07-13-2012, 01:49 PM
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Re: Load Data - 340 WBY

Here are some accuracy loads with my favorite 340 wby. I built this one in 1977 and have taken several animals over 1000 yards with it. It is a 28" 1-10 twist Douglass xx premium barrel on a MK5 action.

215 grain Sierra- 95 grains 7828 at 3270 fps.
250 grain Sierra- 90 grains 7828 at 3030 fps.
265 grain Barnes- 88 grains 7828 at 2905 fps.
Loads are with Federal 215 match primer.
I have not shot the 285 Barnes in this rifle.
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  #14  
Old 07-14-2012, 08:12 PM
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Re: Load Data - 340 WBY

Thanks for all the data guys. I'm going to work with IMR 7828 and H1000 for starters. I'll start working up the loads and post what I find when finished. Should be a month or so. If they don't work, I'll be back looking for more advice.

Regards.
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