Ogtc

[Good Cheer]

I'm gonna call this the old guy Thompson Center project.
Quite a while back a scope mount to clamp on to an octagonal barrel was obtained... and it's been too long to remember whether it was on this website. But, it's a great scope mount.
http://i791.photobucket.com/albums/yy192/SNARGLEFLERK/Navarone%20first%20shots%20fired_zps5z0lqzli.jpg (http://s791.photobucket.com/user/SNARGLEFLERK/media/Navarone%20first%20shots%20fired_zps5z0lqzli.jpg.h tml)
It is a complicated extruded aluminum shape beautifully machined. Without a name or any identifying markings.

So, been trying to figure out how I can make a compression mount with minimal machining.
Aluminum rectangular tube with a smaller inside dimension of one inch may be the ticket.
Picatinny rail affixed to the top of the rectangular tube to mount the scope. Maybe another on the bottom to hold a bipod. Cross through bolting to tighten the tube onto the octagonal barrel.
I'm trying to find reasons why this wouldn't work or wouldn't be easy to make.
It might even be the varminter adapter rather than the OGTC.

[Gtek]

South Paw, right hammer, pistol scope on a smoke pole. You Sir have my attention!

[charlie b]

A long time ago I put a scope mount on a T/C Hawken. Weaver makes it.

[Good Cheer]

charlie b,
Does it clamp on with a friction fit?
Reason I ask is that part of this idea is that the mount could be positioned on the barrel to suit various rifles and scopes, different powers eye relief and such.

[Good Cheer]

Was thinking along these lines for a while...

http://i791.photobucket.com/albums/yy192/SNARGLEFLERK/Renegade%20Mount_zpsteg3m0g2.jpg (http://s791.photobucket.com/user/SNARGLEFLERK/media/Renegade%20Mount_zpsteg3m0g2.jpg.html)

[Good Cheer]

But now I'm pretty much leaning towards trying out some rectangular tubing.
There could even be some relief cut back to provide stock clearance and allow the tube to be moved rewards a bit.

http://i791.photobucket.com/albums/yy192/SNARGLEFLERK/picatinny%20rail%203%20inch%20tube%20rev.3_zpslixu 0aae.jpg (http://s791.photobucket.com/user/SNARGLEFLERK/media/picatinny%20rail%203%20inch%20tube%20rev.3_zpslixu 0aae.jpg.html)

[Good Cheer]

I'd use one of the double lever quick disconnects for the scope and a picatinny adapter bipod.

Being an interchangeable rig (rifle to rifle, scope to scope, one eye relief to another) without drilling and tapping holes is making this a viable alternative to permanently altering rifles.
I'm thinking it would work just fine even if it did look a little like the borg took over TC.

[Good Cheer]

Would maybe look about like this, the blue dots being socket head screws for the through bolting.

http://i791.photobucket.com/albums/yy192/SNARGLEFLERK/picatinny%20rev.3%20ele%20viw_zpskgaoyyvu.jpg (http://s791.photobucket.com/user/SNARGLEFLERK/media/picatinny%20rev.3%20ele%20viw_zpskgaoyyvu.jpg.html )

[Good Cheer]

South Paw, right hammer, pistol scope on a smoke pole. You Sir have my attention!

Heh, you know, like with any cast boolit gun, without the scope I could only tell how good I was seeing instead of how the load development was working. That barrel was christened "Navarone", the 38" long .52 bore using off the shelf Lee and Lyman fifty cal rifle molds.

[charlie b]

The Weaver mount for the TC uses the existing screws. Want a longer mount then use one. You can buy Picatinny rails as long as you want with a flat bottom.

Most BP rifles have at least a dovetail that could be used with an adaptor to make for one screw point. The forward point, if this is just for load development, could be a simple hose clamp with a strip of brass to protect the metal. The rail would be long enough so the clamp would be forward of where the stock meets the barrel.

If I wanted a scope on the gun I'd drill and tap at another point and just use the rail. It could be reversed any time by putting a plug in the screw hole.

[Good Cheer]

You're right. A hose clamp probably could be made to work. I've had them come apart before but they're pretty cheap.
About just for load development, nope, hope not.

[Gtek]

There is an ad on GB that has a box full of TC Hawken Leupold mounts new in box for ten bucks a pop.

[charlie b]

You're right. A hose clamp probably could be made to work. I've had them come apart before but they're pretty cheap.
About just for load development, nope, hope not.

If it is for permanent then get the barrel drilled and tapped as desired. Get a long picatinny rail so you can put whatever kind of scope you want on it.

[Good Cheer]

Drilling and tapping a barrel or multiple barrels isn't desired.
Permanently altering a barrel for use with one specific scope's eye relief isn't wanted. Hence the friction fit.

[pietro]

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I would think that a pinched-on base would move forward under recoil w/o a recoil shoulder or an epoxy under it, to prevent any such movement.


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[charlie b]

Drilling and tapping a barrel or multiple barrels isn't desired.
Permanently altering a barrel for use with one specific scope's eye relief isn't wanted. Hence the friction fit.

If you don't want to drill and tap then you are probably looking at the only way to do this.

For multiple eye relief you just need a long Picatinny rail.

FWIW, I'd still use the existing dovetail or screws to provide an anchor for the mount that resists slipping. As long as you stay with lower recoil loads it should hold up.

[Good Cheer]

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I would think that a pinched-on base would move forward under recoil w/o a recoil shoulder or an epoxy under it, to prevent any such movement.


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The one I'm using now (first picture) has much less contact surface and stays put with 450 grains of lead and 90 grains of powder in the .52 bore. That's in the heavy 38" barrel. Hopefully soon it gets tested on the 26" barrel with the same load to see if the increased recoil pulse makes any difference.