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30-378

 
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  #15  
Old 07-02-2004, 12:04 AM
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Join Date: Nov 2001
Location: Sydney Australia
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Re: 30-378

Over the years I have owned about 20 Mark V Wbys and have also been directly involved with a lot of then that were not mine. At the moment I have a pair of 378s from the Wby custom shop sitting at an Australian gushop waiting for our stupid gun law paper work. I have also had a lot of direct involvement with Rem 700s chambered in Wby calibres with standard freebore with JGS reamers and also chambered without freebore.

There is no doubt that if bench rest accuracy (or at least the full potential of the barrel) is the goal then the freebore is a negative.

However, if the freebore diameter is very close to bullet diamter then the accuracy can be extremely good. If the feebore diamter is too big accuracy is often poor and very load critical.

If there is one thing I have learnt about Wbys rifles is that it does not pay to bet against one on accuracy as some of them are incredibly accurate.

One thing I have noticed with Wbys and I think the freebore is the reason is that they seem to give their accuracy (unless freebore diameter is too big) over a wide range of powders and bore fouling conditions.

If I wanted a nice rifle I would rather have an Accumark in 300 or 30/378 than a Rem Sendero in 300 Win or 300 RUM. But if the ultimate accuracy was the goal then I would take the Rem Sendero and would be expecting to dump the barrel.

Wby triggers with the trigger return spring replaced will virtually always adjust down to a reliable 1 pound.

Mike
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  #16  
Old 07-02-2004, 04:20 AM
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Re: 30-378

Mike375

Hi, haven't seen you around a while. I can only get on AR at home which limits me somewhat.

I seem to remember you were going into bullet making a while back - how is it going?

Cheers
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  #17  
Old 07-02-2004, 05:23 AM
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Join Date: Nov 2001
Location: Sydney Australia
Posts: 40
Re: 30-378

1894

I ended up putting it on hold due to my mothers health which involved a 24 hour care situation for a couple of years. But now that these 378s have arrived and things are returning to normal I will probably revive it and in 375 bore size. Price will also be a lot more attractive now due to US/Aus dollar exchange.

Mike
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  #18  
Old 07-03-2004, 03:54 PM
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Re: 30-378

Cam,

As a smith specializing in extreme range varmint and hunting rifles, I prefer not to use the Wby Mk V action for the reasons mentioned already.

In the amount of time it takes to lap in the lugs of a Mk V, I can have ten Rem M700 actions blue-printed and ready to go.

I can cut the locking lug recesses, rear surface of the locking lugs on the bolt and lap the lugs in to +95% contact in very little time.

This is not possible with the Wby action.

I am in the process of building my personal 1500-2000 yard rifle right now and I will be using a Rem M700 action with a standard 06 bolt face that I have opened up and installed a Sako extractor to.

The barrel I will be using is a 34" 1.350" diameter straight cylinder, Fluted SS Lilja in .338" bore with a 1-10" twist.

The chamber will be cut to the 338 Kahn(338-378 Wby with a 35* conventional shoulder) I feel the double radius shoulder is another accuracy weak point for the WBY rounds.

The barreled action will be riding in a McMillan Tooley 1000 yard BR stock and I will be using a barrel bedding block system of my own design.

For extreme range shooting, I would recommend the 338 over the 300 but both work well with the real heavy bullets.

The thing to remember about the 30-378 is that these huge cases work better with heavy bullets. 220 gr is where I would start. If I were rebarreling I would use either the Sierra Mk 240 gr or the Graves 230 gr ULD.

If your using a 26-28" barrel you might as well use the 300 RUM as it will run within 100 fps of the bigger Wby case in those barrel lengths.

With barrels in the +30 range, the big Wby case will start to pull away from the RUM case.

For the money, I will go with the 300 gr Sierra Mk or 350 gr Graves ULD 338 bullets over any 308 bullet.

Course as a 50 BMG shooter, I like heavy bullets that land hard!

Good Shooting!!

50
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Kirby Allen(50)

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  #19  
Old 07-04-2004, 12:04 AM
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Join Date: Jun 2004
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Re: 30-378

There is another thought for the 30/379 as it needs a big action and that is to use the cz 550 safari magnum in say .300 win mag and open up the bolt face and rails and re-chamber....or start with the .416 Rigby and rebarrel
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  #20  
Old 07-04-2004, 03:32 PM
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Location: Palmer, Alaska
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Re: 30-378

Mike, Fifty...

Thanks for your thoughts there, good stuff.

What kind of MV do you figure you'll get from the 338 Kahn with the 300gr SMK in a 34" tube?

What OAL will it be throated for?

My Bro's M700 in 338/378 WBY is throated for a 4.1" OAL, in a 32" bbl and gets 3000 fps near max load (118gr H870), probably 3050 is on the top edge if he pushed it more, maybe a tad better if he switched to H50BMG, which he'll probably try sometime.

I'm tossing around the idea of a 338/500 Jeffery (Horneber brass of course), as I can still use the 700 action on that case too, but gain on case capacity.
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  #21  
Old 07-04-2004, 07:33 PM
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Re: 30-378

Brent Moffitt,

In talking with Dan Lilja when researching my extreme range rifle project, he told me about his two long range hammers, both 34", one in 338-378 Wby and the other in the 338-416 Improved.

He listed data that reached nearly 3200 fps but he was also using custom actions and not the Rem M700.

There is not doubt the M700 can handle these rounds as it has roughly the same bolt lug surface aare and shear area as the Wby Mk V action, especially when you figure that with a factory Mk V, your lucky if 6 out of the 9 bolt lugs actually contact the reciever.

I do not wish to drive this rifle to full tilt max pressures, I am looking for 3050 to 3100 fps but accuracy will be my number one priority.

I would think that your brothers 338-378 would run a little faster with a quicker powder. From what I have seen, burn rates in the H-1000, Rl-25 and Retumbo are about right for the big 338.

H-870 and H-50BMG would be better suited for the 30-378 from what I have seen.

I ordered my reamer for a throat of .300" long at .0002" over bullet diameter. This system has worked very well for me in the past. This will also allow the 300 gr Sierra to be loaded so that the junction of the boattail and bullet shank will be seated to the junction of the case neck/shoulder.

I do not think I would use the 338-500 Jeffery on a Rem M700 action, that case will create a hell of alot of bolt thrust, much more then the big Wby case.

If it were me I would go with a custom action such as a BAT or McMillan or Windrunner for that round.

Good Shooting!!!

50
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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