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Author Topic: Loading for the 338-378 WTHBY  (Read 290 times)

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Offline Sourdough

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Loading for the 338-378 WTHBY
« on: August 05, 2006, 09:24:51 AM »
Does anyone load for the 338-378 Weatherby?  I am currently loading using the Nosler Manual.  While my accuracy is great, the trojectory is not what I think it should be.  Using the Nosler 225 Accubond bullet, I worked my way up slowly to the max, of 104gr of IMR7828.  There is no high pressure signs, but I am dropping too much at 300 yards.  At 200 I am 5" high, but at 300 It drops to four inches low. 
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Offline PaulS

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Re: Loading for the 338-378 WTHBY
« Reply #1 on: August 05, 2006, 01:08:22 PM »
Quote from: Sourdough on August 05, 2006, 09:24:51 AM
Does anyone load for the 338-378 Weatherby?  I am currently loading using the Nosler Manual.  While my accuracy is great, the trojectory is not what I think it should be.  Using the Nosler 225 Accubond bullet, I worked my way up slowly to the max, of 104gr of IMR7828.  There is no high pressure signs, but I am dropping too much at 300 yards.  At 200 I am 5" high, but at 300 It drops to four inches low. 
Some quick math tells me that your bullet is leaving your muzzle at around 2500 fps to get the trajectoy that you describe. Do you have a chronograph? IMR7828 is a real slow powder for the bullet, have you tried 4350 or H450?
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PaulS

Hodgdon, Lyman, Speer, Sierra, Hornady = reliable resources
so and so's pages on the internet = not reliable resources
Alway check loads you find on the internet against manuals.
NEVER exceed maximum listed loads.

Offline ricciardelli

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Re: Loading for the 338-378 WTHBY
« Reply #2 on: August 06, 2006, 05:44:39 AM »
RL-25 From 96.8 grains to 113.0 grains
 Remington 9-1/2M Primer
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