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Luck with .30-378?

 
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  #1  
Old 11-20-2006, 07:04 AM
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Luck with .30-378?

I have been trying to work up loads for a Weatherby Accumark .30-378 and not been doing very well. For one, the gun seems to be extremely sensitive to fouling (requires very frequent cleaning). Even with a clean barrel I have had a hard time getting any load to consistently shoot better than 2-3 inches @ 100 yards. I have tried bullet weights from 165 to 200 and a very large variety of powders. The couple factory loads I have tried shoot very well (inch or better) so there must be some way to get there but I have not yet found it. Any input from someone who has had some success loading for this round would be greatly appreciated.
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Old 11-20-2006, 07:41 AM
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Re: Luck with .30-378?

wundwrdog, How new is your gun? What factory load have you been shooting, what bullet is in the cartridge? What have you been trying what powder, and bullet combo?
RH
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Old 11-20-2006, 09:01 AM
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Re: Luck with .30-378?

The gun is about 6 years old but without many rounds through it - maybe just over 100 now. The factory load that shoots best is the 180 gr Barnes-X. There was another that shot okay but I don't remember what that load was off the top of my head. As far as bullets, I have tried 165 gr Swift Sciroccos, 180 gr Nosler Partitions, Sierra GameKings and 200 Accubonds. The powders have been primarily Hodgdon including H1000, 50BMG, Retumbo and US869. I think there was at least one IMR powder early on but my father loaded those so I am not sure which one. For one, I am surpirsed with the ease of fouling as the other two Krieger barrels I shoot do not foul badly at all and shoot exceptionally well for many rounds without cleaning.
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Old 11-20-2006, 09:25 AM
CAM CAM is offline
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Re: Luck with .30-378?

Wunderdog
The 30-378 is a little fickle, lots of powder pushin a pin!! I had the best accuracy when I quit pushing the limits and backed off on the velocitys.
I have one of the Accumarks and then had a custom 30-378 built by Howard Wolfe. (Fantastic rifle)
I have killed several Elk with the 30-378 and 180 & 200 grn bullets. the factory gun liked the 180 and the custom I only used the 200 accubonds.

This year I rebarreled to the 30-338 Wolf
It is about 10% less case capacity.

Don't give up on the gun, just back down and be safe!!!

There is some good info several years back.
try the search for 30-378

CAM
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Old 11-20-2006, 09:29 AM
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Re: Luck with .30-378?

You might want to try Tubbs lapping bullet this would probley help with the fouling. I have seen barrels take that long to break in. Is the weatherby a stock rifle? If it shoots the barnes ok start looking for small differences in your ammuntion and theirs check seating depth and adjust primer maybe. The powder choice should work I have always had goo luck with the hodgen I use alot of accurate as well you might look at 8700. You kind of got me here I was thinking you would tell me the factory loads were a flat based bullet. I have seen with weatherbys the throat diameter being excessive and they would not shoot boat tails I'm sorry I'm not real sure.

RH
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  #6  
Old 11-20-2006, 11:32 AM
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Re: Luck with .30-378?

I set bullet seating by put a factory loaded 180gr Nozler BT in the press, run the ram up and screw the bullet seater to until feeling resistance (point when seater reaches the bullet). No loads have shot what I would call poorly and the 180gr TSXs shoot very well.
If memory serves me I am using 111gr Retumbo and 215 primers. This is a max load in my rifle only getting a little better than 3400 fps.
My rifle is not an Accumark however it is the cheaper Stainless Mark V. Yours should shoot better I would think.
All I have done to mine is free float the barrel I believe the accumarks are already free floated but I may be mistaken.
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Old 11-20-2006, 05:35 PM
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Re: Luck with .30-378?

Boy that sounds familiar!

Anyway, if youre using a bipod or even a rest of sorts on the fore end of the stock, you will need to grind the lip off of the end of the stock under the barrel. Chances are, if you sit the rifle on a bench with a bipod, you most likely cant slide a dollar bill between the barrel and stock. 2nd, try RL-25. That was the only powder I could get to shoot worth a crap in mine (was being the operative.)

If I remember right, 107 grains of RL-25 under the Barnes XBT 180 shot decent at about 3450 FPS.

Good luck.
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