Free Bore

[Jtate]

What free bore for 70 gr blitzkings, and 75 to 87 Vmax? Will I reach the lands with a 87gr vmax and a .113 freebore ?

 

[geraldgee]

I assume you are referring to 6BR. While I don't shoot the bullets you referred to, I do shoot the 87gr VLD's. My 6BR is chambered with .070 FB. I hope this helps. Good luck.

Gerald

 

[Jtate]

Yes 6mmbr

 

[urbanrifleman]

Yes, but barely.

 

[expiper]

the V-max bullets should be able to touch,,,,the blitzking ???? very un-likely ,,,,.080 is long for the short bullets ,,,let alone .113,,,Roger

 

[Dusty Stevens]

Itll be too much by the time your barrel is shot out

 

[urbanrifleman]

I think people have gone crazy on these stupid long freebores trying to avoid the donuts. When they should just go to bigger necks.

 

[RussellJ]

What free bore for 70 gr blitzkings, and 75 to 87 Vmax? Will I reach the lands with a 87gr vmax and a .113 freebore ?

I made a spreadsheet using Bryan Litz bullet data from one of his books to research bullet seating depths for the 6XC, do to so many different reamer prints I have looked at. If I change the cartridge length to a 6BR with a .113" free bore I show the following:
Bryan Litz doesn't has the 70grn Biltzking data in the book I have.
*75grn V-Max has .066" grip on the bullet plus the .125" boat tail length= . 191" bullet length in the neck.
*87grn V-Max has .113" grip on the bullet plus the .125" boat tail lenght= . 238" bullet length in the neck.
*88grn Berger Varmint HBC FB has .133" grip on the bullet plus zero boat tail= . 133" bullet length in the neck.

 

[Dusty Stevens]

I think people have gone crazy on these stupid long freebores trying to avoid the donuts. When they should just go to bigger necks.

No matter how thick the neck is a donut can still form.

 

[urbanrifleman]

No matter how thick the neck is a donut can still form.

No I meant the chamber neck. The brass cannot expand enough in the donut area. Hence the donut. Old SAMMI chamber sized necks never had donuts.

 

[Jtate]

I was sure the '113 was too long for the bullets I want to shoot, the only reason I asked about .113 freebore is that reamer is available off the shelf from grizzly no wait. A custom reamer is 6 to 10 weeks out. Based on reading some old threads people were recommending free bores for varmint bullets from 0 to .080. So I am fishing for someone that shoots one of the bullets I listed at a known freebore that can tell me it shoots great,or it doesn't, do not want to re invent the wheel.

 

[HTSmith]

I was sure the '113 was too long for the bullets I want to shoot, the only reason I asked about .113 freebore is that reamer is available off the shelf from grizzly no wait. A custom reamer is 6 to 10 weeks out. Based on reading some old threads people were recommending free bores for varmint bullets from 0 to .080. So I am fishing for someone that shoots one of the bullets I listed at a known freebore that can tell me it shoots great,or it doesn't, do not want to re invent the wheel.

I have a .060 freebore and 75 Gr Vmax's work well.

 

[Dusty Stevens]

I was sure the '113 was too long for the bullets I want to shoot, the only reason I asked about .113 freebore is that reamer is available off the shelf from grizzly no wait. A custom reamer is 6 to 10 weeks out. Based on reading some old threads people were recommending free bores for varmint bullets from 0 to .080. So I am fishing for someone that shoots one of the bullets I listed at a known freebore that can tell me it shoots great,or it doesn't, do not want to re invent the wheel.

Some bullets like jam then they also like the long jump the same so for instance a bullet likes .010jam well that same bullet may like a .115 jump. Seems like all bullets have this trait so you can look for the long jump node and keep it moving

 

[T 700]

I been shooting 70gr blitzkings in my 6br with .60ths free bore, it works great plus I can shoot the 105 class bullets if I want, mine is a 8 twist. Both shoot great!

 

[joshb]

Bump.