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338/416 Imp on Rem 700 or 721

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Old 01-08-2008, 05:59 PM
Bronze Member
Join Date: Dec 2007
Location: North Idaho
Posts: 34
338/416 Imp on Rem 700 or 721

I have always been kind of hesitant to build this caliber on a Rem 700 action because of action strength concern.I have noticed that several members on this site have 338LM built on these actions.I also understand that Remington is now offering the 700 in 338LM.I have a few 700 & 721 actions all CM, reamer,headspace gauge, and 416 brass.I also plan on using the action as a single shot with 32" barrel.Any owners or builders of this caliber or the 338LM please let me know what you think. Thank You

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Old 01-09-2008, 12:06 AM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 5,466
The reason the Remington is not recomended for the larger case head
.600+is not because of strength but because you have to open the bolt
face up and this removes most of the boltface shroud.

I use the MK 5 Weatherby action for the big cases(case heads larger
than .534)

Not to blow my own horn but I designed a 416 based on a 375 RUM
that will fit the magnum bolt face(.534 with out any modifications
to the action and brass is readily available at 1/3 the cost of the Rigby

It was built on a 700 rem long action with no change to the magazine
or the action. (the idea was to build a dangerous game rifle that was
with in range of the average hunter (under $3'000 as opposed to $7 or
$8.000,oo dollars.

It is called the 416 BUFF and is capable of pushing a 400gr bullet
over 200ft/sec faster than a 416 Remingtion mag, so far i'm at
2670 and no real pressure signs.And all loads tested to date have
shot under 1/2 MOA.

My 350gr loads are above 2700ft/sec and shoot nice (50.8 ft/lbs
of recoil).

Just my 2 cents worth
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Old 01-09-2008, 02:01 AM
Bronze Member
Join Date: Dec 2007
Location: North Idaho
Posts: 34
JE Custom

Thanks for the feedback I wonder what remington is using for the 338LM?
I think your 416 buff sounds really good.

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Old 01-09-2008, 06:27 AM
Platinum Member
Join Date: Jul 2002
Posts: 2,856
Ibelieve that the biggest torubles with chambering the Rem action in the realy big case heads is like J E said the bolt nose diameter , onceits opened up that far their leave little room for a decient extractor setup. It can be done and their are alot of 338 Lapua's out their as well as 378Wby cased rifles built on Rem 700 actions. Are thier better choices , yea but if you have a Rem 700 laying around it will work. If I were going to bui,ld one I would ceratanly only build on a CM action and I'd have my barrel made so that its 1.35" at the shank rather than 1.25" , probably not needed but I'll pay a bit more for extra insurance.
Si Vis Pacem Parabellum
Molon Labe
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Old 01-09-2008, 11:23 AM
Bronze Member
Join Date: Dec 2007
Location: North Idaho
Posts: 34

Thank you for the feedback, I ordered my barrel with the 1.35 shank and am planning on installing the Sako or M16 extractor. probably the M16 because of being held by pin.I might also install this in alum. barrel block.Thanks again.

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Old 01-10-2008, 09:39 PM
Bronze Member
Join Date: Apr 2004
Location: North Idaho
Posts: 71
North Idaho?

I've lived in N. ID for a number of years and know of several 338-416 Rigbys built on 700s. All of them are single shots have 30" or longer Lilja barrels and most use custom dies from Hornady. All of the 700s have Sako style extractors but others have been built on Weatherby MkV, Sako TRGS, and Geske actions. All were single shots. Some have taken elk at 990 yards using the 300 gr. Sierra MK.
Some are barrel blocked, some weigh under 16#, some weigh over 65#.
Contact me if you want to talk offline.

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Old 01-11-2008, 12:47 AM
Posts: n/a
A great action a lot of folks don't talk about is Armalite's AR series actions. The action is a bit spendy as custom actions can be had for about the same price around 1100 for the action from Armalite.

The AR 30 in 338 LM is a flat base much like a Winchester only its been opened up to accept the 408 case in the past so thats around .640 dia. I think the bolt dia of the Armalite is .750 (some1 correct me if I'm wrong) so you have plenty of stock left over to retain the structural integrity. The ejection port most also be opened up and is safe to do so according to the email I received a while back.
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