6 BR custom build

[TackDriv3r]

I am having my target single feed 6 BR built with a 26 inch heavy 1:8 twist Bartlien barrel,pillar bedded, .271 standard neck, .100" freebore, Jewel 6 oz. trigger, Mc Millian stock and I am hoping for some opinions / advises on what you guys like. The action will be black with stainless steel barrel. What stock, color, bipod and cheekriser would you prefer? I just can't make up my mind.

Stock type: Mc Millian A 5? https://mcmillanusa.com/mcmillan-rifle-stocks/tactical-stocks-a5/

Stock color: https://mcmillanusa.com/gallery/

Bipod: Atlas or? Just need an attachment for future use, will use a Uncle Bud bullbag or Caldwell rest.

Cheekriser: Saddle or thumbwheel, or clamp bar thumbwheel?
https://mcmillanusa.com/product-category/cat-hardware/

Thanks for the opinions , if any.

 

[swadiver]

what is the intended use?

 

[BRGUY]

The McMillan A-5 is ok for a target rifle. I'm kind of partial to the McHale stock.

Love the Sinclair F-Class bipod.

Jewell trigger - perfect!

Black action and stainless barrel - perfect!

26" 1-8" twist Bartlein barrel - perfect!

What scope? Base? Rings?

Brass? Dies? Powder? Bullets?

Decisions, decisions, decisions...

 

[TackDriv3r]

what is the intended use?

I mentioned its a target rifle.

 

[TackDriv3r]

The McMillan A-5 is ok for a target rifle. I'm kind of partial to the McHale stock.

Love the Sinclair F-Class bipod.

Jewell trigger - perfect!

Black action and stainless barrel - perfect!

26" 1-8" twist Bartlein barrel - perfect!

What scope? Base? Rings?

Brass? Dies? Powder? Bullets?

Decisions, decisions, decisions...

Scope will be an NXS 8-32 MOAR-T, picatinny rail and Badger rings. Lapua brass, Redding competition dies and look for forward to use 105 -107 Sierras, and Bergers. not sure on powder yet.

 

[Drop Port]

I mentioned its a target rifle.

?????????????????????? Bench, F-class, sling, casual? What kind of target? an A-5 Isn't a great choice for BR riding bags, it is a great choice for banging steel prone.

 

[gilmillan1]

I would add more freebore to be able to use the heavy bullets.

 

[comagutsa]

Freebore will be fine for 105gr bullets ..
I run a McMillan f class stock that runs on a Farley front back and seb big foot rear bag.. i use this set up for benchrest and f open

 

[gilmillan1]

I agree that with 100 fb u can shoot the 105 grain bullets but for me, it's at a bare minimum. I like to have that extra clearance inside the cartridge. Besides, it doesnt work the brass as hard or if u want, you can gain a few extra fps.

 

[powderbrake]

TackDriv3r:
1) Cheekpieces: I have two varmint guns with McMillan stocks with cheekpieces. The first had the thumbwheel type, because I thought it could be reset to an accurate position. I was wrong.
It is a little hard to adjust and you would have to count the turns, but you can't count them because you are doing such a small turn.
The second gun I went to the clamp bar. Much easier. HOWEVER...… when I get either of them in position, I cannot remove the bolt for cleaning!
So here is my solution, a wood spacer between the cheekpiece and stock. I went to the range, and found my ideal location, then measured the space between the cheekpiece and stock, and made the spacer. There may be other spacer tricks you can use, but the clamp bar is quick release, for cleaning, and it returns to the exact same spot.

2) Stock type: The A5 has a hook stock, very little on the bag. The A3 has a full length bottom ( see pic, that's an A3) the new A6PRS is another alternative, the pic on the website is wrong, Alex Wheeler has a pic in this link http://forum.accurateshooter.com/threads/mcmillan-a3-a5-a6-prs.3954702/

3) My stock is a swirl pattern, with Black, Dark Olive and Tan Here is a better pic so you can see the color.

 

[JFrank]

I agree that with 100 fb u can shoot the 105 grain bullets but for me, it's at a bare minimum. I like to have that extra clearance inside the cartridge. Besides, it doesnt work the brass as hard or if u want, you can gain a few extra fps.

I could have enjoyed a little more freebore than the .093 I have now although it shoots well having extra would really come in handy for the Berger seating test from -0- to .120 jump.
I feel as I'm somewhat limited now on bullet choices if I needed to jump .120 there wouldn't be a lot of case capacity left.
J

 

[gilmillan1]

I could have enjoyed a little more freebore than the .093 I have now although it shoots well having extra would really come in handy for the Berger seating test from -0- to .120 jump.
I feel as I'm somewhat limited now on bullet choices if I needed to jump .120 there wouldn't be a lot of case capacity left.
J

That's exactly my point. Sometimes bullets love big jumps. And I love to have the freedom to test bullets without having to deal with doughnuts

 

[Gilbert Garza]

At .271 you’re gonna be tight on the necks unless you turn them slightly

Freebore, as mentioned.104-110” wouldn’t hurt with those long bullets

1-8 should do fine with most, except 110’s

Atlas bipod

Any stock, take a dart and choose one

 

[TackDriv3r]

At .271 you’re gonna be tight on the necks unless you turn them slightly

Freebore, as mentioned.104-110” wouldn’t hurt with those long bullets

1-8 should do fine with most, except 110’s

Atlas bipod

Any stock, take a dart and choose one

I heard that .272" neck was a better choice for the standard neck. Hopefully the gunsmith has one or i'll order a reamer for him to use.

 

[TackDriv3r]

I agree that with 100 fb u can shoot the 105 grain bullets but for me, it's at a bare minimum. I like to have that extra clearance inside the cartridge. Besides, it doesnt work the brass as hard or if u want, you can gain a few extra fps.

What freebore would be the best bet?

 

[comagutsa]

.104

 

[TackDriv3r]

If I go .114" , how deep will the 105-107 grain bullets seat in the neck? Would there be at least one diameter? What happens if too much compared to .104" freebore?

 

[Gilbert Garza]

What happens if too much compared to .104" freebore?

Bullet will sit on case before being anywhere close to the lands

 

[Boatschool02]

The "one diameter" or "one caliber" worth of bearing surface in the neck myth needs to die out.
Call Sierra Bullet's tech support and they'll tell you the same. Dashers shoot just fine with 0.135-0.155 free bores with 0.100 less neck.
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The search function is your friend. I have posted on this several times given that I went through the same frustrating process when I was planning for my first custom 6BR build. Please feel free to PM if you still have questions.
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FWIW, The difference between 0.104 and 0.114" is SO SMALL... especially on a 6BR with a SUPER LONG neck.
A millimeter is +/- 39 thousandths.
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You might be well served by spending a couple minutes measuring the bullets you plan to use with a Hornady comparator and modified case in hand. You'll be able to visualize the differences as you seat bullets more or less deep into the case. This will go a long way to "understanding" what factors influence freebore decisions. (back from the lands and forward from the neck shoulder junction plus area unsized by bushing) Only comparing bearing surfaces is an incomplete survey. The numbers you want to log & compare are base to ogive and the boattail length.

 

[KenOath]

I heard that .272" neck was a better choice for the standard neck. Hopefully the gunsmith has one or i'll order a reamer for him to use.

Yes most go with a .272” neck diameter if not turning.. A freebore of .094” to .0120” will do the job with the 105 to 107gn range bullet.