6bra fire forming

[kriller134]

Hey guys this is my first time loading a 6mm. Need some load advice for forming a bra. I’m using Lapua brass, cci small rifle, and I have vv n135 for powder shooting a Berger 105 hybrid.

 

[Eric_F]

I load N140 at about 29 gr for fireforming with 105's. Not sure how much faster N135 is but I hope that helps.

 

[TheOfficeT-Rex]

I think N135 is going to be a bit quick unless you use something like 70 or 80gn projectiles. VV only lists N140/540 for 6BR with 105s.

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I used about 32gn of 8208 and some 66gn bullets to fire form. Any middle of the road 6BR book charge will FF the shoulders just fine.

 

[Mk32784]

Should have built a dasher....

 

[OREGUN]

Use your normal load development process…my load didn’t change at all with H4895/105s between virgin 6BR Lapua brass and fire formed. Both shot/shoot sub 1/2”.

Point being, do your normal process and pretend it’s not changing shape in the first firing.

I’m 30gns of H4895/105 hybrids/BR4. .015-.020 off the lands.

 

[Sheldon N]

Hey guys this is my first time loading a 6mm. Need some load advice for forming a bra. I’m using Lapua brass, cci small rifle, and I have vv n135 for powder shooting a Berger 105 hybrid.

Quickload suggests that around 29gr of N135 with a 105 Hybrid would be about right for fire forming. It would match up in pressure to the typical fire forming load such as 29.8 Varget. Expected velocity is around 2780 fps with a 26" barrel.

Once fireformed, you could probably run around 30gr or maybe 30.5 of N135 up to about 2850fps. As mentioned previously the powder is a bit on the fast side for burn rate.

My preference is for H4895, I run anywhere between 29.6 and 30.4gr with a 105 depending on the barrel, usually 2860-2880 fps.

 

[kriller134]

Thanks guys that helps out a lot. I’m just using n135 right now cause I have a few pounds. Hoarding my VARGET for now until I use up all of the 135.