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Problem with shot consistancy 30-378

 
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  #1  
Old 07-30-2007, 12:37 AM
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Join Date: Nov 2006
Location: El Campo, Tx
Posts: 26
Problem with shot consistancy 30-378

I am attempting to work up a load for my partners 30-378. He has in the past had someone reload 180 gr Ballistic tips but 2 years ago we found that ballistic tips do not work well mule deer as they explode on impact. So I loaded a few accubond 180's and his next trip, had success with Ab's on muleys and an Elk. Well his gun has never grouped smaller than 1.5", so I figured that if I could make my Sendero 300RUm shoot 3 shot groups of .25, I could work up a load for his gun to do the same. Well I worked up a ladder load of h1000 starting at 105 grains(per hodgdon load data) stepping up .5 grain increments to 111 grains. At 107 grains, I could get 2 rounds to shoot .5 then a third would be a flyer out at 1.5". 107.5 would act about the same and 108 would begin to open up. We always start with clean barrel , shoot a fouling shot and then go to work. I can't seem to understand the flyers. I do not know the number of rounds that have been down the tube and I really doubt that the barrel is shot out as it consistantly shoot 1.5 inches. Has anyone else had this simular problem? Any suggestions? Thanks in advance for your replied.
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Old 07-30-2007, 08:21 PM
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Join Date: Jul 2007
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Quote:
Originally Posted by s.ferg View Post
I am attempting to work up a load for my partners 30-378. He has in the past had someone reload 180 gr Ballistic tips but 2 years ago we found that ballistic tips do not work well mule deer as they explode on impact. So I loaded a few accubond 180's and his next trip, had success with Ab's on muleys and an Elk. Well his gun has never grouped smaller than 1.5", so I figured that if I could make my Sendero 300RUm shoot 3 shot groups of .25, I could work up a load for his gun to do the same. Well I worked up a ladder load of h1000 starting at 105 grains(per hodgdon load data) stepping up .5 grain increments to 111 grains. At 107 grains, I could get 2 rounds to shoot .5 then a third would be a flyer out at 1.5". 107.5 would act about the same and 108 would begin to open up. We always start with clean barrel , shoot a fouling shot and then go to work. I can't seem to understand the flyers. I do not know the number of rounds that have been down the tube and I really doubt that the barrel is shot out as it consistantly shoot 1.5 inches. Has anyone else had this simular problem? Any suggestions? Thanks in advance for your replied.

My first thought would be possible throat erossion but with you being able to put 2-shots 1/2" apart and then blow the third one out, it makes me wonder. It would help knowing the number of rounds fired down the bore. How does the crown look? Are all raised lands square and sharp? How many rounds are fired at a time before the barrel is allowed time to cool? Have you changed primers or powders and if so, do you still experience the same thing???

D & T
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  #3  
Old 07-30-2007, 09:32 PM
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Join Date: Nov 2006
Location: El Campo, Tx
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The weatherby has a accubrake. I have no idea how many round have been doen the barrel but it was bought new in '98. If I have to guess about 500 pills. The lands appear square and sharp but I do not have a trained eye. I took it out and shot 3 rounds cold, waiting 5 minutes between shots. Using the same powder and primers. I am going to try some 200 gr partitions before trying some 50BMG powder to see if we get any improvement. My 300 Rum loves 200gr partitions. The ballistic tip ammo in the 30-378 tends to shoot tighter groups than the accubonds. Thats strange because of the BC being nearly the same. Back to the drawing board, scratching my head!
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  #4  
Old 07-30-2007, 09:48 PM
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Are you able to touch the lands or is the free bore length to great?

Have you tested the accuracy both with and without the brake?
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  #5  
Old 07-30-2007, 11:00 PM
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Join Date: May 2007
Location: California
Posts: 458
1.5" 3-shot group from a Weatherby 30-378 factory rifle is probably as good as it gets. You might consider a custom barrel, or not...best thing to do is consult an accuracy riflesmith.

At this stage, you're probably wasting your time working up more loads

Last edited by LewisH; 07-30-2007 at 11:04 PM.
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  #6  
Old 07-30-2007, 11:30 PM
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Join Date: Feb 2007
Location: "upstate" New York
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My 30-378 did the same thing every time. factory or hand loads. I brought it to two gun smiths, the last being Bob hart, and after putting a better brake on it and lapping the barrel, truing the action, trigger work, cryoing(spelling?) the barrel, and bedding the action securely, the rifle began to shoot properly as I consider it. It now will shoot 5/8 all day. probably the bedding and cryo treatment had the most to do with it? In my humble opinion the weatherby rifle is not worth the money, only custom for me now. Just ask any of the reputable gun smiths on the site and they will probably give you a list a mile long why they don't like them. Sorry weatherby guys, but this comes from someone who used to love weatherby's. That is until I tried something else! Don't get me wrong I still use, and have my longest kill with a weatherby, I just think the gun should not have required all that work when it cost $1900 when I bought it! No one can deny that most factory rem's can run with any factory weatherby for half the cost. Still, if you have the gun I guess you have to make it work like I did. take it to a reliable gunsmith and let the man do his thing!
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  #7  
Old 07-31-2007, 06:49 PM
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Join Date: Jan 2006
Location: Nebraska
Posts: 507
First check to see if the barrel is touching the forearm. If it is I would freefloat it. I did that to mine before I ever fired a shot and it shoots very well. Mine likes I believe 111 gr Retumbo with both Hornady 180 IB or Barnes 180 TSX, which is a top end load in my gun. If you havn't already make sure everything is tight scope base, rings etc. I would also try a known good scope on it.
James
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