AR10 Build in 243 Winchester

[Fixer]

Finally finished my first AR10 build. I decided to go with 243 Winchester because it's not the typical choice. I also had about 1000 6mm projectiles that I inherited so why not 243. It ended up a little more than I was planning to spend but couldn't walk away from the Aero builders set at ZX Guns. I am currently working up loads for 105gr Hornady Match and 75gr, Hornady HP. I have found that this gun needs more pressure to cycle than some of the ammo out there. I bought a box of Federal 90gr SP and it would not pick up the next round reliably or hold open on the last round. The Hornady 75gr Superformance Varmint seemed to run fine and my 105gr handloads with 6.5 StaBALL. Accuracy seems good so far as I am still working up loads.

Parts List:
Aero Precision builders set in Gunmetal Grain
Bear Creek Arsenal 24" SS barrel 1/8 twist rifle length gas
Aim Surplus SST trigger and NIB BCG
Daniel Defense stock and grip
Aero Precision buffer tube kit
Strike Industries enhanced LPK
Magpul 20 round magazine
Standard Low Pro gas block and tube
Magpul MOE MLOK bipod
Mountain Tactical Rad Fat Man Break in 6.5, technically for a Tikka rifle but worked with crush washer
Mostrum Tactical 30mm cantilever mount
Vortex Diamondback 6x24x50 moa scope

All in all I am loving the way it came together.

First few rounds at 100 yards. The flyer the first shot and was my bad. I was happy with the next 3 rounds though. Just shooting off my tailgate with a bag. Target is an 8" bull

 

[Mgderf]

Instead of increasing chamber pressure, you could try installing a lighter buffer spring.
Might be just enough to get it to cycle.

 

[Fixer]

Instead of increasing chamber pressure, you could try installing a lighter buffer spring.
Might be just enough to get it to cycle.

I thought about that. I haven't worked up a load for the 75gr bullets yet. The Federal factory ammo I bought was extremely dirty, so I won't be buying any of that anyway. The 75gr Hornady factory ammo worked just fine.

 

[Michigan Slim]

I've long thought of an AR in .243. My daughter has a bolt gun and me a Ruger No. 1 in .243. Nice build.

 

[Fixer]

I've long thought of an AR in .243. My daughter has a bolt gun and me a Ruger No. 1 in .243. Nice build.

I had a Rem 700 in 7mm Magnum and have shot an AR10 in 308. I am really liking the 243. Recoil is smooth and light compared to either of other two. All decked out the gun came in at 9 lbs. 7 oz. with an empty mag.

 

[bgcatty]

Finally! Someone at INGO builds an AR on an “old” tried and true cartridge and not the latest, probably soon to be forgotten, whiz bang new “super” cartridge thought up by companies who can’t even keep up with demand for ammunition for what’s already been proven tried and true! My !!!

 

[42769vette]

About 6 months ago I got a dtech ar10 in 243. I wanted a 12 twist for 58-65 gr bullets, so it took them better than a year.

I went with 243 over 6mm creed because in light bullets the 2 calibers are equals, and I already had forster dies and lapua brass in 243. Had I intended to shoot 80+ grain bullets, the creed would have won out.

I got it just in time to throw a load together and start shooting yotes. My intention is to start heating up the load and finding that higher accuracy note this summer. For the time being, the lower node (much bigger and easier to find) is shooting 58gr vmax's at 3750 out of a 20 inch barrel, sub moa

Hope to push the limits, and get 3950-4k and keep it moa or less.

 

[Sniper 79]

That is a dream gun. Love the .243! Nice job. I'd go find some pigs to shoot. Deer and yotes too.

 

[yetti462]

What's not to love with a 243.? I got a bca side charger the shoots amazing.

 

[Mgderf]

What's not to love with a 243.? I got a bca side charger the shoots amazing.

I'm curious

Did you get a complete rifle or just an upper?
Do they offer just uppers?

 

[yetti462]

I'm curious

Did you get a complete rifle or just an upper?
Do they offer just uppers?

Just the upper. I read reviews and was iffy on bca, then thought for $350, wth I'll try one. It shoots great I'll find a pic of group and post it.

 

[yetti462]

The group in white is 4 shots. The other 5 we're dialing in the elevation. First load I loaded up for this and it is a keeper. 65gr VMAX

 

[Mgderf]

Just the upper. I read reviews and was iffy on bca, then thought for $350, wth I'll try one. It shoots great I'll find a pic of group and post it.

Thanks.
I recently got their .450 Bushmaster side charger upper for my 2023 Ingo lower.
I love it.
Might have to look again at the .243...

 

[bwframe]

How carefull do you all have to be with semi-autos in .243, reference barrel burn out?

I had always been told to be very slow about follow up shots, at the range, with a bolt action?

 

[Mgderf]

How carefull do you all have to be with semi-autos in .243, reference barrel burn out?

I had always been told to be very slow about follow up shots, at the range, with a bolt action?

A lot of that advice is due more to barrel harmonics than throat erosion or " barrel burn out".
Accuracy suffers as a barrel heats up.