7 stw action?

.284

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Aug 14, 2009
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220
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British Columbia Canada
Hey guys, say a guy wanted to build an stw with bergers new 195 grain as it's diet. What action would be long enough to hold the rounds in the mag and also eject a loaded round through the ejection port assuming you seated them fairly long and close to the lands? I have a sako 75 stw and the detachable mag is actually longer than a sendero ultra mag magazine but if I try to chase the lands you have to pull the bolt out to remove a loaded round. I don't think a custom reamer is the answer because these long vld's are way too deep in the case when seated to the mag length. Single loading does not bother me but I sure would like to be able to eject a loaded round.
Thanks
 

grit

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Mar 23, 2005
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1,375
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Utah
The Stiller Predators come cut to accept an extended mag box. They also have a slightly elongated ejection port. Stiller also offers a longer action called the Tac338.


You can order similar set ups, to your specs, from Defiance Machine.
 

edsSTW

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Joined
Mar 24, 2012
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1
they have mag extenders for the model 700 that would give you a mag length of 3.85 over the standard 3.65. it does take some gunsmithing but would be well worth trying that before spending $1500 on another action
 

7stw

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Jan 21, 2010
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Salisbury Maryland
Hey guys, say a guy wanted to build an stw with bergers new 195 grain as it's diet. What action would be long enough to hold the rounds in the mag and also eject a loaded round through the ejection port assuming you seated them fairly long and close to the lands? I have a sako 75 stw and the detachable mag is actually longer than a sendero ultra mag magazine but if I try to chase the lands you have to pull the bolt out to remove a loaded round. I don't think a custom reamer is the answer because these long vld's are way too deep in the case when seated to the mag length. Single loading does not bother me but I sure would like to be able to eject a loaded round.
Thanks
Well, first things first. I too have a Sako 75, in 7 mm STW, and two Remington STW's, one is a semi custom, and the other is a factory Sendero. The longest magazine is the Sako. I can load them out to 3.702 OAL, and still fit into the box. However, the Sako , and both of the Remingtons are freebored. I do not know how much, but would not be surprised if it wasn't in the .300-.325 area. Nevertheless, it precludes the ability to engage rifling, and fit into the box. If you have a series V Sako, that is about the longest factory action that I know of. I have been shooting , or have shot Berger VLD's that are 168 grain, and thet shoot just fine. I do think that if you were to load them out to engage the throat, you will not be able to eject a live round, unless you pull the bolt. What caliber is your Sako in? I bought mine Christmas eve, and absolutely love it. So anyway, either action will work, but you will have to pull the bolt to extract a live round. Welcome to the Brotherhood of the 7mm STW.

AIM SMALL, MISS SMALLgun) :) 7 STW.
 

Fred Ea

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Joined
Feb 24, 2012
Messages
113
Location
Hope Hull, AL.
I have a friend that had a Winchester model 70 express SS action in 7stw and it was longer that the regular model 70 LA and handled reloads well with bullets seated out longer. I don't know if it is any longer than a Remington action and I can't remember how long the oal was. The sad thing is that the rifle got stolen and hadn't seen one since to replace it, it would shoot too. I dislike a thief more that anything, probably got sold for a crack rock.
FE
 

etisll40

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Jan 28, 2009
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1,775
Location
Rochester, NY
Wyatt makes extended mag boxes and is pretty well known for them. I have one with my Stiller predator action, I think it is 3.80"
 

etisll40

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Jan 28, 2009
Messages
1,775
Location
Rochester, NY
The Wyattes model CFE-9 magazine and F-10 follower allows a Rem 700 Long action to be extended to handle up to 3.990" cartridge overall length. It rrequires minor machining of the action and bolt stop. but so does the shorter 3.825" Wyatt's magazine.

CFE-9 Magazine Box, Wyatt's Outdoor

The information I have is that the neck of a 7mm STW with the shank of a 180 Berger seated 0.278" deep (so the shank is at the shoulder) will give a cartridge overall length of 3.877" Personally I like to keep the shank of a bottail bullet a bit in front of the shoulder for good velocity consistancy. I would use the longer Wyatt's magazine if going to the effort to do the modificaitions.

Before modifying the action for an extended magazine you might want to test the rifle as a single shot to see if the barrel's throat works well with the seating depth and overall cartridge length you plan to use. . The modificaitons for an extended magazine don't change that. You can of course extend the throat depth with a throat reamer if necessary.

So far I haven't made the decision to shoot 180 Bergers regularly in my 7mm STW's. At ranges to 1000 yards lighter bulllets have some advantages, like better accuracy unless wind deflection is dominant.
 

jpeaston

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Jan 5, 2010
Messages
65
I was thinking about the same bullet/cartridge combo, and after reading and thinking about it, I am going to go the 7x300win route.
 

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