Extended Mag box + heavy barrel = trouble ?

hemiford

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Oct 7, 2013
Messages
266
New project build: Rem 700 7stw with the Wyatt long mag box modification
and long & heavy Benchmark MTU barrel.

It seems to me that the new barrel, if floated, will act as a stupendous
cantilever hanging off of the 700 receiver.

How much of the barrel length can be bedded onto the stock ( supported )
before it's really not floating anymore ? I'd be using a wood laminate
stock. The whole benefit of floating the barrel is so that flexing of the
stock with temperature and humidity won't push the barrel and change
POI, am I correct ?
 

FearNoWind

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Jul 10, 2012
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North Central Valley California
I consider any bedding beyond the recoil lug to qualify under the category of "the barrel length ... really not floating anymore".
The whole benefit of floating the barrel is so that flexing of the
stock with temperature and humidity won't push the barrel and change
POI, am I correct ?
The flexing of the stock is one factor. The barrel's dynamics and propensity to change dimensionally as it heats up and make contact with the stock is another.

What does the barrel weigh?
 

hemiford

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Oct 7, 2013
Messages
266
Hi,
I don't have the barrel in my hands yet, but I'm guessing around
7 pounds (?). It's as long as Benchmark said they could make,
either 36" or 37", I forget.
 

FearNoWind

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Jul 10, 2012
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Location
North Central Valley California
Hi,
I don't have the barrel in my hands yet, but I'm guessing around
7 pounds (?). It's as long as Benchmark said they could make,
either 36" or 37", I forget.

Based on their catalogue, the MTU is available at 27 or 28 inches and weighs in at about 7#. By the time you chamber the rifle and do the finish work on it you'll lose a bit of the weight. I have a 6.5# Bartlein M40 barrel of the same caliber fully free floated on one of my competition rifles. It's backed up with a bedded action that simply doesn't move and the weight of the barrel on the bedded action is not a problem at all.
 

bigngreen

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Nov 24, 2008
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SW Montana
A 36 inch 284 MTU contour could be pushing 10 lbs I bet looking at the Pacnors weight calculator. I think your going to have a challenge if you did order a 37 or 37 inch barrel! Unless you mean 26 or 27 inches then you'd be fine!
 

Hired Gun

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Apr 21, 2003
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North Bend, Oregon
That is a lot of barrel for any repeater to support. I have hung 32" free floated on a 700 and it works great but 37" is something else. I think a barrel block mount and float the action would be ideal.
 

bigngreen

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Nov 24, 2008
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I'd defer to Hired Gun, I have not built with a 37 in barrel but I was thinking barrel block also. That's a lot of barrel without a big hole through it so it's going to be tank!
 

hemiford

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Oct 7, 2013
Messages
266
HiredGun, your solution is what has been gnawing at me and is what I
was hoping to avoid. Will definitely make the project more involved.
I need no convincing that it will work, just that it will be more effort
to plan and build.
If I ask about barrel blocks in this thread it would be getting off-topic,
I'll start a new thread.
Thanks All !
 

sambo3006

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Jul 30, 2004
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1,371
Location
SW MO
Well, if it looks like it is going to be an issue, you can always lop off some barrel length. I can't really think of any critter or target that would be safe from a 30" barreled STW!
 

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