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Too much powder? Beginner needs some help!!

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Old 03-13-2007, 01:02 AM
Junior Member
Join Date: Nov 2006
Posts: 22
Too much powder? Beginner needs some help!!

I've got a Weatherby 30-378 Accumark and am shooting a 180 Barnes TSX. I came up with some loads using Retumbo powder based upon Hogdon's website that shows a 113grn max for a 180gr bullet. The load that worked great for me was 110grn of Retumbo that averaged 3415fps. I then checked Barnes website and they show the max to be 105gr of Retumbo.

I haven't had any over-pressure signs like sticky bolt or flattened primer, but if I look very, very closely I can see an ever so slight ejector mark. Half the time I cannot even see it unless the light is just right.

I also checked Weatherby's website and they show their factory ammo with the Barnes 180 going 3420 at the muzzle.

Soooo..I'm thinking I'm okay with this load, but I want to make sure.

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Old 03-13-2007, 04:50 AM
Platinum Member
Join Date: Mar 2007
Location: MN
Posts: 1,219
Re: Too much powder? Beginner needs some help!!

I am not familiar w/ the 30-378 wby mag, but here is some general advice. Better safe than sorry. Just because Wby pushes their bullet faster doesn't mean the you can match these speeds. Wby may use a different powder that will produce more acceptable chamber pressures with that particular bullet. I cannot give you any reasurement on increasing your powder level. However, I generally look at the primer to tell if the powder level is too high. However, I would be vary concerned about the discrepencies in the powder levels!
I used to re-load but now I "hand-load".
-- Well, at least I try --
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Old 03-13-2007, 08:39 AM
Bronze Member
Join Date: Jun 2005
Location: North Pole, Alaska
Posts: 51
Reloader 25

I beleve Reloader 25 will fit the bill!
Jeff in Alaska
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Old 03-13-2007, 09:43 AM
Gold Member
Join Date: Dec 2006
Location: FREE RUN, MS
Posts: 774
Re: Too much powder? Beginner needs some help!!

Here is what Barnes vol 4 will say....


180 TSX

H4831 91.0 97.5 3277 87%
MAGPRO 93.0 98.0 3220 79%
RL 22* 91.0 97.5 3256 87%
7828SSC 89.0 97.0 3209 83%
AA870 112.5 118.5 3286 96%
H1000 95.0 102.5 3191 91%
MAGNUM 98.5 106.5 3278 87%
RETUMBO 97.0 105.0 3242 95%
US869 112.5 119.5 3318 96%
H50BMG 108.5 116.5 3270 104%

Your 5 grs over with no signs....I dont see a problem with that. I ve loaded alot 5 grs over with no signs. Also Ive noticed vol 4 seems to be more conservative than vol 2 or 3, I just wish it was published so we could have TSX load data and not be playing these guessing games without spending $50 to access the info on the net.
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Old 03-13-2007, 09:45 AM
Silver Member
Join Date: Sep 2001
Location: medford wi usa
Posts: 273
Re: Too much powder? Beginner needs some help!!

I've played with retumbo a quite a bit in 30-378, 300 wby and 300 win mag. I can tell you that in the 30-378 hodgdons data is strong and Barnes is weak. That being said I think you are at the max. You don't want to shoot in significantly warmer weather than you have done your testing and you don't want to let the bore of the gun get overly fouled. Personally if you could find a load down at 3350 that shot really good I think you would be better off when you get out in the field hunting. Moisture, dust, crap that can get into barrels after days of hunting can jump the pressure a bit. I found this out in Alaska with my 340 wby after 3 days of solid rain. Even though I had the barrel taped moisture had gotten in.
If you have a hand held primer you will "feel" in 2-3 loadings if those loads are too hot as your primer pockets will most likely be getting loose. Weatherby brass is a bit soft and will tell you pretty quick if your loads are hot by expanding the primer pockets.
These are my opinions...others may try and tell you different.
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Old 03-13-2007, 11:19 AM
CAM CAM is offline
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Join Date: Jan 2002
Location: Utah
Posts: 390
Re: Too much powder? Beginner needs some help!!


1+ for what Kraky said!!

This fire breathing demon is very tempermental.

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Old 03-13-2007, 11:32 AM
Junior Member
Join Date: Nov 2006
Posts: 22
Re: Too much powder? Beginner needs some help!!

Thanks for the replies gentlemen. Anyone else?
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