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Load Data - 340 WBY

 
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  #1  
Old 07-11-2012, 07:54 PM
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Load Data - 340 WBY

Does anybody have load data for the 340 Weatherby shooting 265gr or 285gr bullets? Most books only go to 250gr. I'm shooting a Weatherby Accumark if that makes any difference.

Right now, I'm looking at the following recipe that I derived through some comparisons and simple calculations:
Barnes 265gr TTSX
H4831sc powder
Fed 215 primers
3.675" COAL

I calculated that a starting load of 76.0gr would be safe and working up from there in 0.5gr increments. Expected velocities should be around 2550 - 2650 fps.

Thoughts?
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Old 07-11-2012, 09:32 PM
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Re: Load Data - 340 WBY

Out of the hodgdon #26 manual for the 340 roy =

275 grain bullet(no make listed)
h870 90.0--- 2594 FPS
H4831 75.0--- 2377 ____80.0--- 2569 FPS
H450 75.0--- 2349 ____80.0--- 2537 FPS
H4350 71.0--- 2460 ____74.0--- 2575 FPS
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Old 07-11-2012, 11:03 PM
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Re: Load Data - 340 WBY

That's good data Lefty. Thank you! I'll need to go grab a Hodgdon manual.

It appears I should be okay adding one grain for the 265gr bullet and subtracting one grain for the 285gr bullet for the starting load and working from there up. Now to run the ballistics and see which one produces better down range.
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Old 07-12-2012, 06:28 AM
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Re: Load Data - 340 WBY

Quote:
Originally Posted by majestrate98 View Post
That's good data Lefty. Thank you! I'll need to go grab a Hodgdon manual.

It appears I should be okay adding one grain for the 265gr bullet and subtracting one grain for the 285gr bullet for the starting load and working from there up. Now to run the ballistics and see which one produces better down range.
They actually have less data for the 340 roy in the new manual. They are only using h4831 and h4350 with the same charges as I listed already. I've got #26, which was put out in the mid '90's and has rl series in addition to h, I, and win powders.
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Old 07-12-2012, 04:05 PM
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Re: Load Data - 340 WBY

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.
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Old 07-12-2012, 04:24 PM
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Re: Load Data - 340 WBY

Quote:
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.
He asked about data and wanted confirmation about his h4831 weights. If he wants rl25 or retumbo I'm sure he'll ask. H4831 isn't that fast a powder, is is compressed in my 338win. By the way I'm getting 2900 fps with rl19 in my 338win with a 225 hornady or accubond. I'd bet rl19 or rl22 would be better than retumbo or rl25 in this cal.. I've tried Magpro and have had hang-fires with listed loads; I'll not buy that powder again. To much chance of running a bullet into another left by a squib.
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Old 07-12-2012, 07:55 PM
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Re: Load Data - 340 WBY

FWIW - I called Barnes today to see what they had. He said to use any data for a 275gr bullet for either the 265gr or their new 280gr LRX bullet and use the slower burning powders to get better velocities - H1000, IMR 7828, etc.

Doing some online search, I've found the following starting loads for 275gr bullets:
84.0gr IMR7828 2600fps
81.5gr RL-22 2650fps

I still haven't found anything for H1000 or RL-25. I'll probably extrapolate those values from the data given above. Right now, I'm leaning towards IMR7828, RL-22 and H1000. Probably not going to use 4831 or 4350 as the velocities are quite a bit lower.

If anybody has better data, I'd appreciate anything you post. Regards.
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