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WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

 
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  #22  
Old 10-16-2010, 10:18 AM
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Join Date: Jul 2010
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Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

I have since developed a new hunting load for my 338/378 Accumark which is 112.5 grain of Retumbo with the Barns 225 TTSX. This load shoots consistently in the .400" of an inch with an average velocity of 3191 fps at 68 degree F with a cold or hot barrel. I never heat my barrels to more than 130 degrees F which you can tell by being able to touch the barrel for about 1 second before you have to pull your hand off. I had initial problems with sticking cases which were caused by necks that were a few thousands of an inch over the limit of 2.913" I trimmed them back to 2.895" a bit shorter than recommended and things are back to normal. My other load is the Hornady 225 SSTs with the same powder load for the almost exact same velocity. This one does not shoot as well but is not far behind and is below 1 moa consistently and they both have the same point of impact. What I like about these 2 bullets is that their BC is almost identical at .514 and .515 which is literally the same as far as I'm concerned. I use the Hornadys for practice and the Barns TTSX for hunting. I use the Redding deluxe die set and neck size my cases only. My chamber is a really tight chamber for a factory gun which I'm sure helps my accuracy. This is pretty good for a stock rifle out of the box.
Can one buy something better? Most likely but at what cost and for what amount of accuracy improvement? Also for me the Weatherby stock fit me well and this one shoots fine for my intended use which is moose, elk, bear and caribou hunting at longer than usual distances. I like the look of the rifle as well. I would like to put a Huskamaw 5 by 20 on it in the future but that will have to wait as I'm a father with 2 small boys 8 months and 2 1/2 year old on a limited income. The Bushnell 6500 series 4.5 by 30 loses a lot of sharpness above 20X but does the job for now!

Guns are like woman, every man has different tastes!
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  #23  
Old 09-09-2011, 05:56 AM
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Join Date: Nov 2007
Posts: 110
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

I know this is an old post but I am going to add my two cents worth as there are a lot of us on here that shoot these rifles, Try 2 grains over max of RE-25 (107gr) for a MV of 3146. with 225gr TTSX (tipped) Good accurate load in ny gun shooting off a sturdy bench and 6-9inch Caldwell bipod with rear sandbag.Load your OAL as long as possible and still operate in the magazine. Load your shells carefully. I am getting 5 shot groups of .435" at 100 measured meters I have had this rifle pillar and skim bedded by Dave Jennings of Jennings outdoor sports in Pritchard B.C. Although I dont need it I also have a timney trigger on order that I am going to install in this gun; I dont see how it could possibly shoot any tighter. By the way I also have the NEAR single piece Triple ring mountinng system for my Leupold MKIV Long Range Tactactle 6.5X20-50MM with TMR recticles. The Near scope mounts bold to a Pictanney rail on the rifle. My groups seem to stay consistently tight These new tipped TTSX shoot like a house afire as they are a monolithic bullet of solid copper this could be the reason as they do not fly out of trajectory because of being ever so tiney out of balance. Thats my story and Iam sticken too it. Remember work up slow, I have spoken with the barnes people over the phone and the have reassured me that by carefully working up you can safely (most of the time) exceed their max recommend loads in their manual.
Cheers @ Tighter Groups: Eaglesnester
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  #24  
Old 06-06-2014, 01:54 AM
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Join Date: Jun 2014
Posts: 1
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

I purchased a weatherby accumark this year with a accubrake in 338-378.
Put on it a steiner military 5-25x56 scope.
I tried 185 Barnes TTSXBT bullets with 105 grains of reloader 25 shot 300 yd groups of 1.08". decided I wanted a heavier bullet so tried Barnes ttsxbt 210 grains and 100
grs of hogdgon hybrid 100v at 300 yds I got .375" 3 shot groups. Iam so happy with the groups I got with the 210 gr that I will never use anything else.
My rifle is now a tack driver as far as iam concerned.
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  #25  
Old 07-26-2014, 12:40 PM
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Join Date: Jul 2014
Location: Outback Oz
Posts: 8
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

Did you end up getting 338/378 ?
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  #26  
Old 07-28-2014, 12:39 PM
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Join Date: May 2011
Location: in the hills of vic AUS
Posts: 146
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

Quote:
Originally Posted by ldvn12 View Post
I purchased a weatherby accumark this year with a accubrake in 338-378.
Put on it a steiner military 5-25x56 scope.
I tried 185 Barnes TTSXBT bullets with 105 grains of reloader 25 shot 300 yd groups of 1.08". decided I wanted a heavier bullet so tried Barnes ttsxbt 210 grains and 100
grs of hogdgon hybrid 100v at 300 yds I got .375" 3 shot groups. Iam so happy with the groups I got with the 210 gr that I will never use anything else.
My rifle is now a tack driver as far as iam concerned.
.125 moa better take that to a bench rest match
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  #27  
Old 08-02-2014, 01:20 PM
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Join Date: Feb 2008
Posts: 186
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

here is my 2 cents...I had a 257 weatherby and I know its not a 338weth...Well mine shot the factory 115 at 3/4 inch 100yard groups. I tried several loads and never could get it to shoot better than the factory weatherby loads. It sound like the 338/378 is a larger case capacity but speed is not everything. I sold mine and got a savage 6.5x284 and it shot out of the box several different loads at 3/4 inch. I worked up a load with the 140VLD and its a 1/2 inch gun as long as I do my part. For me my next rifle will be a full custom rig. Honestly its what you want and yes its good to make an educated decision on things but if you know the product you will be getting or if you go with a fully custom rifle that will do everything you are wanting it to do then I would spend the extra doe and be happy. also weatherby brass is expensive to say the least..but its also getting hard to find the RUM brass as well. Also with a custom gun/caliber/case builder I would think they will have a proven load development recipe and have test fired in your gun with a target to prove it accuracy. This is what I would expect if I was laying down some large amounts of doe for a custom rifle. Also have the conversation of what your expectations are and what bullet you pan on running and I bet the builder will let you know weather it a good or bad option or what would be the best options to go with for as setup to what you are tring to achieve.. Not dogging the weatherby but its still a factory rifle just a high end factory rifle....just like my rem 300 ultra sender. Still a factory rifle but I had it bedded, trigger job done, and a muzzle break. Last load I was tring was shooting below .5 inch. I just need not to go and streatch out its legs and see what it will do. I might do that today... good luck...

Last edited by Wachsmann; 08-02-2014 at 01:28 PM. Reason: spelling mistakes
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  #28  
Old 08-03-2014, 09:24 PM
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Join Date: Feb 2008
Location: North Dakota
Posts: 67
Re: WEATHERBY ACCUMARK V 338/378- WHAT ACCURACY TO EXPECT ?

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My Accumark seems to shoot fairly well for a factory rifle. I am shooting 300 grain Nosler Accubonds on top of 92 grains of IMR 7828 SSC.
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