BRA Powder selection

[savageshooter86]

VV N135/150/140. Are all three of these viable options in the 6BRA using 103/105gr Bullets?

thank you

 

[mjeff23]

I use N140 in my 6BRA and 6Dasher with excellent results

 

[22DASHER]

Should try 140 first...

 

[EricF]

In my 26" BRA barrel with 105 hybrids, N140 has identical speeds to Varget. Hits pressure a little sooner, but it's less temp sensitive than Varget.

 

[NZ_Fclass]

Due to supply problems with Varget, I will be trying IMR4166 in my BRX. Loading has been acceptable in the 308, velocities down a bit in the 223, but I expect that it will be fine.

 

[Harvey McCraw]

8208 works great for me

 

[urbanrifleman]

In my 26" BRA barrel with 105 hybrids, N140 has identical speeds to Varget. Hits pressure a little sooner, but it's less temp sensitive than Varget.
View attachment 1235759

You are saying that N140 is less temp sensitive than Varget? I am curious, how did you determine that?

 

[TylerFromMS]

Due to supply problems with Varget, I will be trying IMR4166 in my BRX. Loading has been acceptable in the 308, velocities down a bit in the 223, but I expect that it will be fine.

I used have 4166 in dasher, br, and bra. Works really well. There's always shooter's world precision, as well...

 

[EricF]

You are saying that N140 is less temp sensitive than Varget? I am curious, how did you determine that?

Shot a ladder at 69 F in early October, and 31.6 gr of N140 got me 2933 +/- 5 fps with 105 hybrids. Late October at 34 F the same load was 2915 fps, so 0.51 fps/deg F.

For comparison, 31.5 gr Varget was 2920 fps at 69 F, and 2885 fps at 34 F, so 1.0 fps/deg F.

I was surprised too, as I've hear people talk about how temp sensitive Varget is. I only shot four of the N140 (Lab Radar only caught two), then I shot the Varget right after.

But, here were the Varget velocities in order: 2879, 2889, 2894, 2901, 2906, 2909. Definitely speeding up, but I figured I was shooting too fast and heating up the barrel so I averaged the first two as I figure those are best representative of the 34 degree velocity. It's an MTU profile barrel so plenty thick, and I wasn't shooting faster than 1 per minute.

 

[Jdne5b]

@EricF do you have a fireform load for N140? Is this Lapua brass?

 

[NZ_Fclass]

I used have 4166 in dasher, br, and bra. Works really well. There's always shooter's world precision, as well...

Unfortunately, we dont get Shooters World or Vectan powders down here. Having ADI "next door" you think that we would be awash.But no. It's all going to Hodgdons!

 

[EricF]

@EricF do you have a fireform load for N140? Is this Lapua brass?

Lapua brass. Haven't tried N140 fireforming, sorry. But 29.6 gr Varget is my fireforming load, so...