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BiggerHammer

Just finished my latest build 22" , 8 twist, .243 LBC.

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Most builds I pretty much attack and they come together fairly quickly. This was one of those builds where parts went in a big box over a period of six months or so as I came across good deals and things were randomly purchased at leasure when it was convenient.

 

I stubbled over the box one day, literally. Dug through it and thought. Heck, there's almost a complete rifle there, I need a barrel and a handguard. So I finished it up.

 

I built this rifle to specifically shoot the 95gr Berger VLDS, with the 105gr Hornady, 100gr Clinch River and 106 Clinch River in mind. I have a 6x6.8 for the lighter stuff. I wanted this rifle to shoot the heavies at distance for long range RockChuck hunting here in Central WA.

 

Here's the build specs:

 

Black Hole Weoponry

22" custom contoured barrel, turned lighter than a standard but heavier than the light contour.

Rifle length gas

5/8-24 thread

Lancer 16.25" carbon fiber handguard

MagPul Key Mod bipod adaptor

Harris swivel bipod

Viking Tactical Key Mod single point sling attachment(Mounted on handguard)

Fortis "RED" muzzle brake/compensator

Geiselle Super gas block

Nitride gas tube

Mega Arms side charger upper receiver

NIB bolt carrier. With locally custom machined side charger and install

Type 1 bolt

Griz Precision billet lower reciever, built like a tank!

Anderson Arms lower parts kit

CMC 2/2 flat trigger. 2lb first stage, 2lb second stage. No creep, breaks like glass

 

Noveske 60 degree selector/safety

Odin Works extended magazine release

Spikes Tactical "Spider" grip

MagPul PRS

.308 buffer spring and buffer, they work better for the LBC & 6.8 SPC wildcat chamberings

 

30mm AADMount with bubble level and 30 MOA built in

Leupold LRT 6.5-20x50, M1 turrets, Mil-Dot reticle. So I can dial in MOA if need be or hold Mils in the optic. Best of both worlds in my opinion.

MagPul MS3 sling

 

 

I didn't have time for a formal range session off the bench with the Magnetto speed and all. I just had to see if it went bang and functioned. So I threw together some loads with Lapua cases, Hornady cases and neck turned Hornady cases. I turned the necks of the Hornady 6.5 Grendel cases with a Sinclair neck turner in their 6.5 form and then necked them down.

 

I broke the barrel in with Hornady 87gr BTHP's and Butches. The barrel as always cleaned up well right out of the gate and I was pleased to see that even with a clean bore the first round was right on the money, which isn't always the norm but always a treat when a barrel Performs like that. I may attribute that to the Mega Arms heavy billet uppers, I have notice that with the side charger or the standard heavy receivers. They are stout and on every build I've used them on they seam to shoot tighter that most other uppers I have used.

 

The range session was a classic Central WA set up. Prone in the boonies on a blanket, off a bipod with the a rear bag. So I was more than pleased with the first groups the rifle produced.

 

IMG_2437_zps6jy2opet.jpg

 

Here are a few informal targets, a chunk of cardboard propped up at 110 yards. Some pastors slapped on it and it was go time!

 

The target on the left was 5 rounds with 105gr Hornady BTHP match bullets on top of 31gr of CFE223, Lapua cases @ 2.300 lit with a BR4. I choked the last shot, over thought it and felt it when the trigger broke 😕

 

The target on the right was 3 rounds with 95gr Berger VLD's, same Load as above but with non neck turned Hornady cases. I could have done better, it was latter into the shooting session and I could tell I wasn't as stable and I had some mirage at 20X.

 

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Here's a pic of some of the cases from the 105 Hornady load.

 

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I'm looking forward to a formal range session and velocities but more than pleased with the initial results.

 

Here's some pics of the rifle, she may look slim!👊 But she weighs in at 13lbs empty!🤕

 

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Edited by BiggerHammer

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I was a able to make a quick trip to the range today. Conditions were less than ideal, switchy gusting winds up to 10mph or so. 50 degrees with a slight drizzle of rain.

 

This trip was the first go round with the 105gr Hornady A-Max and again, considering all. I was pleased with their performance, all the groups pictured were 5 shots at 100 yards. The 105gr Hornady group, was with a cold clean bore. Fired that group, then the lower left, then the upper left.

 

FullSizeRender_zpsy1w0lt12.jpg

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You managed to duplicate our experience with the 105's quite nicely. It shoots them very well with little effort. We want away from them when we found the 95 Bergers and SMK's would shoot faster and flatter over long range. The decreased TOF was a major plus in some of the applications I have been using them in.

 

That barrel sure looks like a winner. Thanks for posting up those great groups in those conditions.

 

greg

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Took it out to 300 yards yesterday. I had a series of dots staggered vertical at 300 yards. I left my scope on my 100 yard zero, held the top dot at 300 yards and shot three (3 shot group bottom target in photo) the group printed 12" low at 300 yards with my 100 yard zero. I then dialed up 4 MOA and held the same dot and fired five for a group ( 5 shot group, top target in photo).

 

Slightest right to left breeze in a light rain.

 

IMG_2480_zpsswt4suw3.jpg

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Good stuff right there!

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Took it out to 300 yards again today. I had cleaned the rifle several days earlier. I finished up by running a patch with a bit of Rem oil on it down the bore and followed it with a dry patch before I put it in the safe.

 

I was running the same 105gr A-Max load as mentioned prior in the thread

 

Got set up on the bench, off the bipod with a rear bag. Dialed 4 MOA up from my 100 yard zero to my 300 yards zero. I knew my cold, clean bore shot would be slightly out. I had steady light breeze right in my face, I knew I would be a little high shooting into the wind and decided not to dial for it. I fired the first round and as expected with the cold, clean oiled bore it was high and left. I then fired the next four and watched them stack up on 20X power through the scope. Ran down to check the group. The last for went slightly over a inch at 300 yards. I need to work on my 95gr Berger VLD load. I fired 18 at 300 yards and they came in at about 3 1/2" total group size for all 18. MOA of deer heart or RockChuck but they just aren't shooting as well as the 105's are in my 8 twist.

 

 

IMG_2507_zpslmrb9jhh.jpg

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Cleaned the bolt carrier group from the .243 LBC real well today. A adjustable gas block is a must for this chambering. Didn't want to mess with it at the time so just installed a standard Geiselle Super Gas block non-adj. It recoils allot more than all the prior builds I've done with wildcat chamberings and a adjustable.

 

Found that my cam pin was fractured all the way around. I'm surprised it didn't completely fail during the last session. I'm glad I caught it in time before it broke something else.

 

This cam pin is beat to hell for only having 200 rounds on it. Not good for the bolt or carrier group.

 

IMG_2519_zpsbbp0qmxl.jpg

 

IMG_2520_zpsbldx4rih.jpg

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Beyond a doubt the adjustable helps in a great many applications when we want to stretch the powder choices out. I have one BCG with well over 2000 rounds and it is still running strong in my 243 LBC with the adjustable set up to just toss them out of the port. I also have a 6X6.8 that is essentially the same with similar break free results.

 

Greg

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I agree we put a LSR Sentry 7 adjustable on the last 24" .243 LBC and it is a much smoother shooting rifle.

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I agree we put a LSR Sentry 7 adjustable on the last 24" .243 LBC and it is a much smoother shooting rifle.

 

A half turn on the BTE's I use often completely eliminates swipes and those horrendous ejector marks. My F-class 223 and 243 LBC are set up to just barely clear the bolt catch. They even have the ejector spring shortened to allow cases to dribble out of the port and land on my mat.

 

Greg

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Nice shooting!

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Finally got a chance to run my 105gr A-Max loads over the Magnetto Speed. I've found that with my rifle even though the Alexander Arms head stamped brass which is made by Lapua is more accurate with the load I am shooting than the 6.5 Grendel "Lapua" head stamped cases.

 

My bases accuracy load I started with is bellow, it is a solid half MOA load under good conditions and on a solid, steady trigger day for me out to 300 yards which is where I test most loads at.

 

My base load from a 1-8 twist, 22" custom slim (Custom) contour BHW barrel. 5/8-24 thread with a Fortis .308 "RED" muzzle device.

 

105gr Hornady

31gr CFE223

CCI-450

A-A Cases

2.300

Avg 2801

SD-9

 

All loads listed bellow shot under 3/4 MOA. I started raising the powder charges by .2 increments. These are the speed results, fairly impressive for a AR. CFE223 powder makes the .243 LBC chambering with the 105gr A-Max a true performer and if one looks in the Hornady reloading manual. The speeds you see bellow are just at about max for published load data from Hornady for the .243 Winchester and the 105gr A-Max.

 

These are the Magnetto speed results for the base load mentioned above, increased by .2 increments.

 

31.2gr CFE223

Avg 2834 SD13

 

31.4gr CFE223

Avg 2865 SD6

 

31.6gr CFE223

Avg "Error" the sensor had slipped forward from recoil. No speed data. Still shot tight.

 

31.8gr CFE223

Avg 2902 SD12

 

Some other findings.

 

Using CCI 450 primers gave me 20fps over using the same combo with Remington 7 1/2's on the average but weren't as accurate as the loads using A-A head stamped cases.

 

Using Lapua head stamped cases with the same load gave me 30fps over the A-A(Alexander) head stamped cases on the average in my rifle.

 

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Edited by BiggerHammer

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That looks good. I had heard that current AA brass is now being made by Hornady. I suspect that this was done a long time ago as I have been having some issues with some of my AA stuff bought two years ago.I see some DREMEL time in my future cutting down a couple to compare with my known Lapua.

 

The CFE is showing to be a very flexible powder. Getting those speeds out of the little case is pretty impressive out of an AR. I wonder how the brass life is going to be.

 

 

Greg

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