You can see that this technique allows low mounting. The size of the scope ocular and objective bells are the usual limiting factors,
and possibly protruding power-changer ring projections.
Compare it to the "ultimate low" on a CZ 550 Magnum 500 Mbogo:

Use either Leupold QRW or Burris Xtreme Tactical rings with equal abandon, in whatever height you need to "clear the bells."

Don't worry about lack of QD lever on the Burris rings pictured above:

Burris Xtreme Tactical rings are of great value for the dollars:

Of course, if you have a long-enough scope tube, this is as functional as it gets:



... but not as low as possible with the Bubba Gunwerkes mounting system, which also allows for mounting of shorter-tubed scopes,
and for mounting them farther away from your eyebrow.

Bubba Gunwerkes first considered this mount ready-made from CZ-USA, but found it wanting for strength of attachment
... unless it was also 8x40-screwed and J-B Weld epoxied everywhere possible, to the square bridges of the CZ ...what a mess that would be ...
and the height was excessive:

Hence Bubba Gunwerkes began R&D for the Seyfried-Style Extension Base for the CZ 550 Magnum:
Inventory code at Bubba Gunwerkes for this model will be #SSEB-CZ550M.

Parts is parts, still lookin' through the parts tote:

Prototype #SSEB-CZ550M is at top of picture below:

Many options are available for "customization" of the #SSEB-CZ550M mount from Bubba Gunwerkes,
as long as they all include J-B Weld and 8x40 screws, two or three base screws in each piece of the two-piece sets.
Heck, Bubba Gunwerkes can even do a one-piece, 20-MOA, Picatinny rail, with minimum 4 to maximum 6 base screws, optional.
J-B Weld is required, not optional.
Failure to use J-B Weld voids any Bubba Gunwerkes Warranty.

Rip ...

I have found a way to eat my cake and have it too!



The barrel on the above .458 Lott rifle will be replaced
with my last take-off CZ .458 WIN barrel.
Then a Seyfried-Style Extension Base will be installed
for use of any scope I like.

Then the .458 Lott barrel might be transformed back into
a .458 WIN of M70 Featherweight knoxform
by shortening at the breech end
for installation on a .300 H&H Pre-'64 M70 action.

Yep. Eat my cake and have it too.
Washed down with sweet lemonade.

Rip ...

quote:

Originally posted by RIP:
Need to mount a Nikon SlugHunter on CZ 550 Magnum .458 WIN?



This will get us to page 71 and beyond, for THE MISSION.

Rip ...

Beins I'm by and large an M77 Mk2 guy, I haven't forayed into the realms of separate ring and base setups. That changed when I got the Kimber Montana 338. ( I would like to take an angle grinder to the Montana word on the receiver) . It always makes me laugh at the joke .

<img src="https://image.ibb.co/gkK0yK/20180819_195646.jpg" alt="20180819_195646" border="0">
<img src="https://image.ibb.co/g0u0yK/20180819_195500.jpg" alt="20180819_195500" border="0">
<img src="https://image.ibb.co/cTYSdK/20180819_195358.jpg" alt="20180819_195358" border="0">

So I was thinking about cutting out the center section of the base. I HATE not being able to wrap my thumb around the action when packin the rifle around.

CTF,

Sounds like a good idea.
What happened to the pictures?
I like pictures.

Rip ...

Resizing of CTF's images:

I never seem to remember which thing to click on.
Trying again.



Try this.

CTF,

You might do well with a pair of Burris Xtreme Tactical 30mm rings, Medium Height.

Rip ...

Big thumbs. Need high or xtra high to get my thumb under the scope.

I wanted Xtra high , Kimber 30 mm 1 piece ring and bases but everyone was out of them.

Vertical split rings are never as good as the horizontal split rings,
especially when the main mounting nuts on these are torqued to 65 inch-pounds,
and you have a dozen screws holding the two ring tops:




Also, you can get Picatinny ringtops for the Burris Xtreme Tactical and mount a laser on top of the scope.
Maybe a combo laser-flashlight-strobe, and induce epileptic seizures in your quarry.

Rip ...

I must say, this Kimber action and rifle is pretty minimalist ! If a guy wanted to build a light weight 458 Win , this would be a good action to start with.
I do know that this 26" barreled light weight 338 Win shooting 225 gr bullets has a bit more recoil than the 375 Ruger Guide Gun shooting 250 gr bullets. Both with Nosler book max loads.
Not that it's disconcerting. But it's pretty light weight. It will prolly get some barrel reduction surgery when I've done a bunch of chronographing with the 26" tube. Unless it will give my 2800 fps with a 250 gr TSX. Then it will prolly stay long.

quote:

Originally posted by RIP:
Vertical split rings are never as good as the horizontal split rings,
especially when the main mounting nuts on these are torqued to 65 inch-pounds,
and you have a dozen screws holding the two ring tops:

Those do look good.

The main mounting nuts on these things can be torqued to 100 inch-pounds maximum,
65 inch-pounds is minimum.
That minimum would strip some Warne, Talley, and etc. main mounting screws!!!

Rip ...

https://www.burrisoptics.com/m...treme-tactical-rings

They make them of all steel in 34mm high and extra-high, thin 4-screw, and thick 6-screw now too!
50BMG stuff that!
I have not been keeping up on these!
And here is an example of the Picatinny ringtops:



You can have two scopes sighted in simultaneously.
A Double-Scope Rifle.

Rip ...

CTF,

Does that Kimber .338 WIN Montana have a floorplate or blind magazine?
How much does yours weigh dry/empty/no-scope or rings?
Allowance will be made for the weight of the Picatinny base if you did not weigh it before you installed the base.

Rip ...

Its a blind mag. 4, 338 Win rounds in the box.
Don't know the weight yet. Need to get a scale. Easily noticeably lighter than the 375 Ruger GG .
As it is in the pic its 1.5 lbs ?? lighter than the 375 without a scope or rings but with 3 rounds.
The scope , rigs and base are more than 1.2 lbs. So, it's really light.

Nice thing about the picatinny ring caps , easy to mount a flashlight. As long as the turrets aren't too high.

quote:

Originally posted by RIP:
https://www.burrisoptics.com/m...treme-tactical-rings

They make them of all steel in 34mm high and extra-high, thin 4-screw, and thick 6-screw now too!
50BMG stuff that!
I have not been keeping up on these!
And here is an example of the Picatinny ringtops:



You can have two scopes sighted in simultaneously.
A Double-Scope Rifle.

Rip ...

use it on my ar15 doubt i will put one on my 458 ...

medved,

You have chosen wisely.
The Burris P.E.P.R One-Piece AR Mount has two, square-faced, steel, recoil keys on the bottom of it.
I have one too, with the Picatinny ringtops.
Mine has a Sightron SIII 1-7x24mm Illuminated Red/Green Center-Dot Duplex scope clamped in it.

The mount could stand up to recoil of a .458 WIN, but the big-ass, 30mm Tubed, illuminated scopes might not.

Best to keep it on the ARs.

Rip ...

A mockup:



Four projects pending to add replies for THE MISSION:

1. .458 WinRuger load workup to 2600 fps with 400-grain Speer, with subsequent translation to 400-grain GSC HV accuracy testing,
in both .458 WinRuger and .458 WIN.

2. 450-grain North Fork FP (copper monometal FN solid) versus 450-grain CEB Safari Solid (brass monometal FN):
Penetration comparison at 2350 fps MV in the Iron Waterboard Buffalo at 25 yards range,
one inch of plywood plus nine inches of water in plastic Sterilite 9-quart, flat-sided buckets per compartment,
ten compartments in a row.



Either .458 WIN or .458 WinRuger can be used interchangeably here.

3. .458 WIN on CZ 550 Magnum with Seyfried-Style Extension Base for Nikon SlugHunter scope.

4. Featherweight Pre-'64 M70 .458 WIN.




Rip ...

You keep showing off that Slug Hunter scope and I'm gonna have ta buy one. Has it showed any signs of having recoil related problems yet ??

quote:

Originally posted by RIP:

Ya know , really, that's a nice looking rifle