.408 Cheytac Build

To be clear this build was completed in accordance with all applicible laws both Federal and State.

Please find below the build process outlined and build parts sourced for this project.

Since the mile shot was completed and repeated successfuly my Uncle decided it was time to step up the game a bit. His plan to be completly revealed at a later date requires the use of a serious extreme long range cartridge. After some very careful consideration, running numbers, looking at what is available and what is performing well in the Extreme Long Range Shooting community. He settled on the .408 Cheytac. We hashed out the parts list over a few months of phone calls on the weekends looking over different Cassis systems, actions and how well they would work with existing gear. Once a bill of materials was agreed upon funds were transfered over the course of a year and things started to show up.

Here's the Build list.

1. Stiller Tac 408 in 1.450" diameter with a .408 bolt face

2. XLR ind. Evolution HD Cassis with the following options.

Extreme Butt stock,

Side folder adapter

Pic rail

Seven round AICS mags 2ea.

3. Timney 517 set up with 2# pull

4. ULR Stainless scope rail in 60 MOA (Yes thats one degree of slope)

5. Talley Tactical 30mm rings High

6. Leupold Mk4 8.5-25X50 Lr/t TRM retical

7. Elite Iron 50 class Revolution Bipod

8. .408 Caliber 1-13 twist Krieger turned blank in 1.450" with a straight taper to 1.250" at the muzzle.

9. And a newly designed muzzle brake that I made

10. Custom Cerakote work all done by me.

The Support list.

1. Reloading dies From Dave Viers of Viersco MFG.

2. RCBS Ammomaster II reloading press

3. 150 projectiles from Cheytac in 419 grain turned solids

4. 200 projectiles from Lehigh bullets in 400 grains.

5. 8 pounds of retumbo powder

6. CCI Large rifle Mag Primers

7. 100 Bertram and 200 Peterson brass cases,

8. .408 Cheytac Finishing reamer from Manson reamers

9. .408 Headspace gauges from Manson

10. Pelican 1770 rifle case

All told that comes out to just about $13,000.00 in parts and labor for this progect.

It all starts right here with a Stiller Precision arms TAC 408

Shown below is a comparison to a standard length Savage action.

This is a massive action yet not so large as the 50 class actions that are extremely massive

This is the Muzzle brake that will be machined from solid prehardened 4140 alloy steel, Ports are .375" and .3125" diameter.

Side ports are angled back 15˚ top ports are perpendicular to bore at 120˚ vertical split. Needless to say it performs very well

Setting up the barrel and cleaning up the breach in prep for chambering and threading to the action. Barrel was set up in a four jaw chuck and a spider at the rear of the head stock. Dialed in with an indicator and gauge pins to as close as my .0001" indicator could read with lathe runout. What can I say she's an old machine and not tool room spec. Run out from end to end was less then .0005"

Chamber reaming and fitting action to barrel varifying headspace. Rifle was headspaced with about .001" clearance on the go gauge or in other words minimum headspace.

Threading for the muzzle brake

The completed barrel

Muzzle crown closeup and tools that needed to be made for barrel fitting. This is my rendition of a Sergeon rifles action wrench. This wrench works very well at appling torque to the strongest part of the action and the closest to the tennon. Keep in mind guys there is no reason to torque a barrel to more than 80 ft/lbs. The barrel just needs not unscrew due to vibration.

Fitting and appling final torque to the barrel. That is a home build barrel vise designed after the Brownell's vise. It's mounted to a 5/8" A36 steel plate and a 4x4" 1/4" wall square tube and bolted to the floor with drop in anchors. I've bent action wrenches trying to remove Howa barrels and yet the stand refuses to budge.

Tip: Uppon final torque witness mark the barrel to the action or pinned  recoil lug.

First mockup, Changes will be made. Notice scope is touching free float tube. Notice the three bars on the stock, they are aluminum and will be replaced with steel to add more weight to the rear of the weapon to correct ballance. Muzzle brake to come. yet to be made in this picture

Dies Made by Viersco Mfg Black Diamond rifles Dave Viers. Placed and order and six weeks later this is what we got. They are not refined in any way with complicated chamfers, asthetic fluting and whatnot. No, these are tools pure and simple and they work perfect. Bullet seater has a Micrometer adjustment that can be zeroed in any spot you like. It also has the floating chamber bullet guide to insure perfect bullet to case alignment. I've loaded rounds with these dies that produce a three shot group in the .600" range Yeah thats right a .408 CheyTac that's SUB MOA.

You are also going to need a press with a lot of throw to it. this is the RCBS Ammomaster 2 big enough to load 50 BMG. Seen here with a dummy round being made up for cycling and testing. Real loads to follow

The Elite Iron Bipod. We searched high and low to find a good bipod for this rig and we looked at them all. nothing came close to the Revolution from Elite Iron.

She's not cheep at $650 at the time of this writting she is well worth it. Solid 4140 heat treated steel everywhere with my count of 22 parts total it is an engineering dream and a machinists nightmare. No bearings, or external springs to snag break or otherwise ruin your day.

This bipod is well worth the money.

Please note the above picture of my daughter. The bolt is open for all you safety Sally's out there.

I have a modest Youtube channel that i will post a link to and have a review of this bipod. I don't shamlessly plug a product just because. Elite Iron offered no discount, we paid full bore for this and had to wait like everyone else. Needless to say in the testing process of this rifle I've put 50 rounds down range and the bipod has yet to give me any issues what so ever. The legs may seem skinny and flimsy but this is tool steel, Ordinance steel, Barrel and receiver steel, it's tough stuff and the bipod is very stable and strong. It's also very light weight considering it's 100% steel.

Muzzle brake

It's in there some where just have to remove all the pieces of whats not needed. Solid 4140 prehard or P-20 for the mold makers reading this.

Start off by squaring up the block and drilling the bore hole first.

Then bore and thread for the muzzle threads all on the same set up to insure concentricity and angular alignment.

Fit barrel to brake joint will be sanded smooth before Cerakote so the joint will appear seemless

Set up the brake at a 15˚ angle drill and ream seven holes per side to .375" diameter, then set up at 60˚ to drill and ream top holes six per side. Cut faces to proper shape. water test for flow.

Stainless bars added to butt to replace aluminum bars.

This allows a longer length of pull and adds 1.5 lbs of additional weight to the rear. I'm also going to machine a stock tube from solid to add even more weight.

Older brother James having fun behind the rifle.

I'm personally fueled by Guiness and Newcastle and this rifle was built with copious amounts of said beverages consumed

Cerakote work done, Apache art work and of course the Punisher

I tried to make the pattern stand out slightly while also being subtle

First group then after proper load work up, The rifle now shoots .5 moa groups with no issue.  

Green dot in above pic is 1.25" Diameter and shot at 100 meters