Building a 'Semi' accurate AR-10 in 6.5 CM

Stephen Chandler · Oct 16, 2024

Hi All,

I'm putting together another large frame AR platform firearm and want to set it up to be semi accurate for long range.

Long story short, I used to shoot F-Class with a bolt action and enjoyed it but it just got to be to much prep/time for me to really enjoy it anymore. (kids, wife, life, etc)

I sold my F-Class stuff and got out of it. I'm putting together another one in 6.5 CM to go out and shoot with the guys but i don't want nor plan to be 'competitive' like i was before.

I have two extra sets of receivers that are not built yet and I already have one AR-10 in 308 that's my 'play' rifle if you will.

I have a new Ballistics Advantage 24" Stainless Heavy Barrel in 6.5 Creedmoor that I will use. (i understand this is not the level of a Brux or Kreiger and not expecting that level of accuracy wither)

Currently i have the following:
BA 24" Barrel
CMC 2.5# Match trigger
Toolcraft High Pressure 6.5 Double Ejector BCG
CMMG Ambi LPK

My first question that i have is which receiver set to use.

Currently i have two, i have an Aero M5 Enhanced set and a Stag-10 receiver set.

I like the looks of the Stag more but if the Aero lends itself to being more accurate I will use that.

I intend on shimming/bedding either receiver.

Thank you

JR1200W3 · Oct 16, 2024

Sell both and buy a Seekins SP-10 builders kit for the semi-monolithic upper and handguard

bfoosh006 · Oct 17, 2024

I would tend to use the Aero Enhanced set.

That said... I would suggest you consider a Criterion 22" 6.5CM barrel.
https://criterionbarrels.com/produc...-22-hvy-hybrid-barrel-nitride/?v=7516fd43adaa

The 22" BA/ Aero 6.5CM barrel is heavy, and frankly, mine didn't met my expectations accuracy wise. I realize you have already bought the BA... but ( and I have said this many times ) given the price of 6.5CM ammo, I don't want to waste it trying to make a barrel shoot well.

Good Barrel prices are a bargain in the shooting world.

My Criterion has shot like this , when all the shooting stars aligned. 100yds, 10rds Hornady AG 140gr, Scoped bagged, etc

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (2).jpg

My 22" BA / Aero has never come close to this.

stevieb92 · Oct 17, 2024

Stephen Chandler said:
Hi All,

I'm putting together another large frame AR platform firearm and want to set it up to be semi accurate for long range.

Long story short, I used to shoot F-Class with a bolt action and enjoyed it but it just got to be to much prep/time for me to really enjoy it anymore. (kids, wife, life, etc)

I sold my F-Class stuff and got out of it. I'm putting together another one in 6.5 CM to go out and shoot with the guys but i don't want nor plan to be 'competitive' like i was before.

I have two extra sets of receivers that are not built yet and I already have one AR-10 in 308 that's my 'play' rifle if you will.

I have a new Ballistics Advantage 24" Stainless Heavy Barrel in 6.5 Creedmoor that I will use. (i understand this is not the level of a Brux or Kreiger and not expecting that level of accuracy wither)

Currently i have the following:
BA 24" Barrel
CMC 2.5# Match trigger
Toolcraft High Pressure 6.5 Double Ejector BCG
CMMG Ambi LPK

My first question that i have is which receiver set to use.

Currently i have two, i have an Aero M5 Enhanced set and a Stag-10 receiver set.

I like the looks of the Stag more but if the Aero lends itself to being more accurate I will use that.

I intend on shimming/bedding either receiver.

Thank you

Of those two options I would absolutely go with the Aero M5 enhanced set. I have a few.

You will get a lot of nay sayers here in regards to the BA barrel. I have one of their 22 inch versions and it performed well and still does. I've detailed the load development on it through this forum several years ago. Did I get a fluke? Maybe, but I wanted to give it a try and I'm still pleased with it.

https://www.snipershide.com/shootin...vantage-barrel-140-eld-m-h4350-loads.6392411/

Stephen Chandler · Oct 17, 2024

stevieb92 said:
Of those two options I would absolutely go with the Aero M5 enhanced set. I have a few.

You will get a lot of nay sayers here in regards to the BA barrel. I have one of their 22 inch versions and it performed well and still does. I've detailed the load development on it through this forum several years ago. Did I get a fluke? Maybe, but I wanted to give it a try and I'm still pleased with it.

https://www.snipershide.com/shootin...vantage-barrel-140-eld-m-h4350-loads.6392411/

Thanks for the info.

I dont know if im going to reload for this one this time around. When i was shooting my bolt action at F-class (also 6.5CM) i was reloading for it and honestly i think that took some of the fun away. With the process i went through it just seemed more work, having young kids with young kid activities it got to where i never had time to load and was loading up til midnight or later the night before a match.

Funny looking at your thread, i loaded the same 41.5gn H4350, 140gn ELD-M's and Peterson brass. I dont remember my numbers but they were really good, i think my SD was single digit if i remember right.

Im planning on hopefully finding a factory round that's "good enough" - i have some 140eldM Hornady Match and some Berger 140's. I will keep the brass if i plan on loading in the future but i just don't think i want to. If i do, it will be a much more 'relaxed' process compared to before.

Nice to know your barrel shoots well. I know that i didnt buy top of line but hopefully it does okay.

Stephen Chandler · Oct 17, 2024

bfoosh006 said:
I would tend to use the Aero Enhanced set.

That said... I would suggest you consider a Criterion 22" 6.5CM barrel.
https://criterionbarrels.com/produc...-22-hvy-hybrid-barrel-nitride/?v=7516fd43adaa

The 22" BA/ Aero 6.5CM barrel is heavy, and frankly, mine didn't met my expectations accuracy wise. I realize you have already bought the BA... but ( and I have said this many times ) given the price of 6.5CM ammo, I don't want to waste it trying to make a barrel shoot well.

Good Barrel prices are a bargain in the shooting world.

My Criterion has shot like this , when all the shooting stars aligned. 100yds, 10rds Hornady AG 140gr, Scoped bagged, etc
View attachment 8526104

My 22" BA / Aero has never come close to this.

Thanks for the info - i was thinking of going with the Aero set, might have to now.

this barrel is definitely heavy but i don't plan on carrying this anywhere and most shooting will be done prone/from a bipod or bag.

Since i already own the barrel, ill give it a try and see how it does. If its complete crap ill pick up a better barrel but since I already have it im going to try it out. Starting to think i probably shouldn't glue it in then.

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Building a 'Semi' accurate AR-10 in 6.5 CM

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