LRI Overwatch Magnum Rifle:

[LRI]

Finally got her done. Preliminary tests are encouraging.

Specs:

4140 Chromoly action:

a. Gun drilled/honed bore
b. EDM raceways
c. One piece bar stock machined bolt body
d. 3 position safety with oversize firing pin block
e. Pinned recoil lug
f. Win M70 style trigger
g. Control round feeding
h. Non rotating extractor
i. Keyed 20moa Mil-Spec 1913 base with 10-32 base screws
j. Cone breech design with no extractor cut
k. timed/tuned fire control setup

Barrel:

30" Bartlein 10 twist in 30 caliber

Brake:
LRI's prototype Magnum brake (so far so good) made from some "space ghost" form of SS. (not sure what it is, but it's a biche to machine!)

Stock:

Manners uninletted blank T5A thumbhole

Optics:

USO SN3 Tpal with Horus squiggles. 3-17x

Chamber:

300-338 Lapua Magnum setup for 220grain Lapua OTM Scenar bullets to be magazine tolerant in a Sako TRG magazine

Floormetal:

LRI designed/built DBM using Sako TRG 338 Lapua Length magazines with single button "SIG" style magazine release.

Paint/Finish work:

LRI Holographic Desert pattern on stock and 5:1 mix of Burnt Bronze/Graphite Black ceracoat on all metalwork.

Performance thus far:

3250fps and 1/4 to 1/3 moa at 100 yards using 93 grains of Retumbo with a 215 Federal primer, Lapua brass and Lapua 220g OTM bullets.

Extended long range testing didn't go so well yesterday morning. The 35mph winds, too hot a load, and me just trying to get settled with the gun resulted in some issues. Thankfully the afternoon session went much, much better. It gave me a great baseline to use for the next range test.

Now I just need to practice, practice, practice.


LRI Overwatch Magnum Rifle Slideshow by nesikachad | Photobucket

 

[T J]

Good looking rig Chad, as always. I'm looking forward to reading a few more range reports, get that bitch out!


t

 

[E. Bryant]

Looks great, Chad - that's quite an awesome accomplishment.

 

[Powermac]

A amazing piece of work.
Will be very interested in seeing morre reports, and more info on you're new action.

 

[varmint slayer]

I fondled this beast when I was at the shop a few weeks ago and it is damn impressive. Got me thinking about building a 300-338 myself. 220-240 class bullets over 3000 fps= winning...

 

[T J]

I fondled this beast when I was at the shop a few weeks ago and it is damn impressive. Got me thinking about building a 300-338 myself. 220-240 class bullets over 3000 fps= winning...

No chit. Just when I thought I had all the wildcats I could stand Damn it Chad!

I wonder if a guy shouldn't spin up 2 barrels & keep one for fire forming only.....

I think this beast would be a prime candidate for meloniting as well.


t

 

[varmint slayer]

LRI Overwatch Magnum Rifle:

Do you even have to fire form? Seems like it would be as simple as necking down with bushing dies and good to go.

 

[T J]

For some reason, I had it in my head that this was an improved cartridge.... IDK, i'm still on my first cup of coffee


t

 

[varmint slayer]

If its just as simple as necking down I can handle that. I hate brass prep so I am hoping its a simple one or two step procedure with a die.

 

[T J]

If its just as simple as necking down I can handle that. I hate brass prep so I am hoping its a simple one or two step procedure with a die.

Oh no doubt, I don't have a problem with necking down a couple times, bushings aren't that expensive (I'd probably do at least 2). I hear you about brass prep, I "accidentally" lose my neck turning kit all the time


t

 

[varmint slayer]

LRI Overwatch Magnum Rifle:

If I ever get to the point that I have to neck turn I'm hanging up the spurs...lol

 

[T J]

If I ever get to the point that I have to neck turn I'm hanging up the spurs...lol

I'm telling ya. It was a great idea, until I actually got the damn thing.


t

 

[Speeddog]

Chad, seriously nuts. Very very nice!

Doc

 

[jbell]

Chad it looks very nice! I am loving the use of the TRG mags again! What is up with the fluting or I guess more correctly the machining on the barrel? It looks like there are long acute triangles machined into it or is that an optical illusion?

 

[Blackbrush]

I love "outside the box" stuff like this.

Any reason you didn't just go with a 300 Norma? I can't wait to do a 7/300 Norma!

 

[LRI]

Thanks guys.

Barrel fluting? I experiment on my own stuff. It was an idea that ultimately I don't care for much. Doesn't affect how it shoots so as soon as this stick is cooked, I'll stick another onto it.

I have a 34" tube coming in a 20 twist for 125BT's from Nosler. Hoping to scream out at 4500fps. Dunno, have to see. Quickloads says its possible, but the real world is where I try to live. It'll take some dinking around to sort it out.

Case prep:

It's easy.

New brass:

I use a Sinclair neck mandrel die just to straighten any kinked necks first. I do this to all the cases 1st time around. Just gets everything on the same page.

I made a neck reduction sizer die out of a chunk of barrel and the finish reamer used for the barrel(s). I only went in about 1/4 past the shoulder/body junction. Threaded the OD and screw it into the press. A little imperial and it squishes the neck nice and easy.

Then I F/L the case in a Redding 338LM body die. Just a touch on the shoulder.

Then they go to the case trimmer. I have a Sinclair Micrometer head attached to the wilson body die trimmer setup. Cases run typically around 2.725" after squishing the necks. I trim to 2.710".

Burr the edges as usual.

Then gassem up with primers, gogo dust, and squish a bullet in it.

I run the Lapoopoos at 3.715. Just inside the Sako magazine length.

Easy stuff. Throated the bore +.200 from the ogive. I may go more. . .(this barrel is a lab rat)

I really, really, really want 3400fps out of this biche with the heavy stuff.


Thanks again for the kind words and encouragement. It's been a really fun project. Shooting it in my first match in over 13 years the 5th of Oct. We'll see how it goes.

 

[varmint slayer]

Thanks again for the kind words and encouragement. It's been a really fun project. Shooting it in my first match in over 13 years the 5th of Oct. We'll see how it goes.

Oh great, I have to shoot against that sumbitch Oct 5? Guess I'll have to gas up the 105s to 3300 to stand a chance....

 

[LRI]

Another reamer wss ordered today. Had a thought late last evening. We shall see how it pans out. . .

 

[varmint slayer]

Another reamer wss ordered today. Had a thought late last evening. We shall see how it pans out. . .

Improved 40°....?

 

[Blackbrush]

Still hoping you might share your thoughts on the Norma 300 v the LRI monster. Thanks.

 

[trigger29]

Finally got her done. Preliminary tests are encouraging.

Specs:

4140 Chromoly action:

a. Gun drilled/honed bore
b. EDM raceways
c. One piece bar stock machined bolt body
d. 3 position safety with oversize firing pin block
e. Pinned recoil lug
f. Win M70 style trigger
g. Control round feeding
h. Non rotating extractor
i. Keyed 20moa Mil-Spec 1913 base with 10-32 base screws
j. Cone breech design with no extractor cut
k. timed/tuned fire control setup

Barrel:

30" Bartlein 10 twist in 30 caliber

Brake:
LRI's prototype Magnum brake (so far so good) made from some "space ghost" form of SS. (not sure what it is, but it's a biche to machine!)

Stock:

Manners uninletted blank T5A thumbhole

Optics:

USO SN3 Tpal with Horus squiggles. 3-17x

Chamber:

300-338 Lapua Magnum setup for 220grain Lapua OTM Scenar bullets to be magazine tolerant in a Sako TRG magazine

Floormetal:

LRI designed/built DBM using Sako TRG 338 Lapua Length magazines with single button "SIG" style magazine release.

Paint/Finish work:

LRI Holographic Desert pattern on stock and 5:1 mix of Burnt Bronze/Graphite Black ceracoat on all metalwork.

Performance thus far:

3250fps and 1/4 to 1/3 moa at 100 yards using 93 grains of Retumbo with a 215 Federal primer, Lapua brass and Lapua 220g OTM bullets.

Extended long range testing didn't go so well yesterday morning. The 35mph winds, too hot a load, and me just trying to get settled with the gun resulted in some issues. Thankfully the afternoon session went much, much better. It gave me a great baseline to use for the next range test.

Now I just need to practice, practice, practice.


LRI Overwatch Magnum Rifle Slideshow by nesikachad | Photobucket

It would appear you used the barrel engraving from my .338 Lapua on that barrel. Good to know you still have the program because I have a funny feeling you're about to be doing another one.