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Unread 06-10-2007, 07:02 PM
Silver Member
Join Date: Feb 2007
Location: Florida
Posts: 171

I loaded 300 gr. sierra's in the mark 5. The freebore is so long that it is impossible to reach the lands with about any bullet and still make it fit in the magazine. When I loaded the 300 gr. to .12 into the lands I had to pull the bolt to even get a live round out of the chamber.
Earl Fouraker
NRA Life Member
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Unread 06-11-2007, 07:25 PM
Junior Member
Join Date: Jun 2007
Posts: 1

I have worked & hunted w/ the 338/378. The best powder seems to be Retumbo, & a case full of it. I found the heavily compressed load could be slightly reduced if I used Winchester mag rifle primers, this helped get less run out on a loaded round (less compression). I like the 225 gr. Barnes XXX, it also is the most accurate. I get 1-3/4" 3 shot groups @ 300 yds typically. A great benefit is the Weatherby break, recoil is very low.

Respectfully PA PA.
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Unread 06-12-2007, 07:51 AM
Gold Member
Join Date: Jan 2005
Location: Searcy, Arkansas
Posts: 700

I have owned several Wby's including a 338/378. They have all shot reasonably well after a little work. Bedding the action, floating the barrel, and trigger work. Squaring the bolt face and lapping the lugs also helps. A combination of all the above can turn one into a pretty good shooter. My 416 has been rebarreled by Shilen, and my 338/378 has been totally worked over by Kirby and turned into a 338 Kahn.

Brass is expensive but unless you load to excessive pressures will last for many loading, so not really a big deal.

Even with the 26" barrel the 338/378 will outperform the 338 Edge. The Wby case just plain has more capacity, quite alot more. I'm definatly not knocking the Edge though, it is a great round. I do own a 338 RUM, the Edge is about 100 fps faster than the RUM, but that still does not put it in the same class as the 338/378.

I've said quite a lot without answering your question......I would not expect better than the Wby guarantee of 1.5" from a factory rifle and maybe not even that. Simply not good enough for a long range rifle. Put a new barrel on it and do some work to it and you can have a real shooter. But if you are going to do that your options really open up.

IMHO the 338/378 cartridge is a good high intensity round (even better if you turn it into a 338 Kahn), but the Wby rifles seldom perform to LR standards without some work.
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Unread 06-16-2007, 11:11 AM
Platinum Member
Join Date: Apr 2003
Location: North Bend, Oregon
Posts: 1,497

The Accumark in 338-378 that I regularly work with likes 225TSX's with RL-25 at 3300 fps. This one doesn't even have the trigger adjusted. Shoots 1/2" 3 shot groups with no cooling between shots. My personal Accumarks are all bedded now and shoot better than that. My best 3 shot group 300Wby Accumark from a hot barrel is right at 3" at 885 yards. The load is 200AB at 3100 fps. The wind just died and I had to shoot with a hot barrel. Earlier that same day none of us could even hit that target.
After skim bedding my 3 Accumarks make a lot of these.

Some kids want to be a fireman or a doctor to help people. I wanted to be a gunsmith.

NRA Life Member and I vote.

Only accurate rifles are interesting.

Gordy and Brady.
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Unread 07-05-2009, 12:38 AM
Junior Member
Join Date: Jul 2009
Posts: 2

I have an Accumark in 338-378. My gun will shoot 1 MOA at 200 yards all day long. Accuracy all depends upon who is loading the components and how well they match each other, how much care is taken with each cartridge. I reload my ammo because the factory Weatherby ammo is redicoulously expensive.

it also depends upon how well the gun was built at the factory. to say that all Weatherby's roll off all the assembly line the same just ain't so. each barrel is a bit different, each machine process is a little different.

In my opinion Weatherby makes an exceptional rifle for the money. I had a Weatherby Mark V in .460 WM. it also shot very well.

Are you gonna take it over to Afganistan and snipe Taliban from 1000 yards, or shoot elk at 300? I heard tell that some 1000 yard shooters have been having good luck with the 30-378. If I had it to do all over again would I buy a Weatherby Accumark in 338-378? I sure would. It outdoes most all of the .338's hot rods by quite a bit. Look at the down range energy and drop. Pretty damn flat for a big .338 bullet!

I love my gun. I have a Bushnell Elite 4200 8 X 32 with AO on it. A really nice combination. The muzzle brake works good on the gun, makes it about like shooting a 7mm mag.

Yeah my Weatherby 338-378 is an accurate one. I keep it spotless and I take a lot of care in my reloading.
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Unread 07-05-2009, 02:46 AM
Platinum Member
Join Date: Apr 2005
Location: Alaska
Posts: 4,757

So far, the Weatherby sounds like a crap shoot with respect to out of the box accuracy. I mean a gamble.
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Unread 07-05-2009, 03:20 AM
Junior Member
Join Date: Jul 2009
Posts: 2

Well ultimately you have to make the decision on what to believe about the gun. I've found that like most things that people want to take to extremes requires some adjustments some minor some major. It just depends on how much you want to put into a gun in terms of price. Sure a custom made gun is gonna shoot great but how much better in terms of dollar to performance. Let's say your out of the box Weatherby shoots at 2MOA at 200 yards. You paid $1600.00 bucks for your new Accumark. ( dont' know what's retail on this bun now days). You want better accuracy so a custom made gun shoots a bit more than 1 MOA at 200 yards, and the gun costs $3000.00. Is a MOA at 200 yards worth $1400.00 more dollars? Can you spend $1000.00 to rebarrel the Weatherby and float the action to get nearly the same results in accuracy? Is a custom made gun something you want to take out in the field and get it wet, muddy, scratched up?
You didn't say what sort of game or hunting you had in mind which will also shape your decision.
You sound like an intelligent person to me. Weatherby didn't get to the position they are in today by making mediocre rifles. I'm sure you will come to a wise decision for yourself. It has been interesting to me to read all the different experiences everyone has had with this particular rifle and cartridg combination. Shooting the 338-378 is like no other rifle I've ever shot. It is well behaved, doesn't hurt you because of a poorly designed stock, has a very effective muzzle break, is finished well, has a rugged composite stock and it looks good too. It has a Kreiger Criterion 28" fluted stainless barrel. The cartridge generates a lot of heat and will heat the barrel to the point of creating heat waves within 3 or 4 shots in 45 degree weather here in the Pacific Northwest. The fluted barrel allows the barrel to cool much faster than a standard contour barrel. I like the overall package of the gun. Like I said it has great ergonomics, which is something that should be considered besides accuracy. I have a custom made Sharps 1874 Long Range Express Rifle made for me by C Sharps Arms Company. It is in .50-140 X 3/12" I shoot a 698 grain cast spire point in it with 125 grains of FFG black powder. It recoils harder than any rifle I've ever shot. Harder than my .460 Weatherby magnum. It has a XXX fancy stock and I'm wondering if the cast off or on of the stock is right for me? If you do decide on a custom made rifle be sure to ask them about the stock the length of pull for you, really needle them about it because you have to live with it after it's made. I know you know all this stuff just a little reminder.
Like I said earlier in my reply I like my stock out of the box Weatherby just fine. Some of the other shooters here haven't been as lucky as I have I guess. Who knows why? This is my experience with this rifle.
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