6 BRA fireform Benchrest results

[Thumper]

6 BRA fireform Benchrest shoot

Saturday I went to a local 100 yard benchrest practice match near Grand Junction CO to fireform some BRA brass. I wound up with a .4366 AGG for 5 relays. I didn’t think that was bad for a thrown together fireform load with no load development or tuning.
The goal was to to fireform brass, break in the barrel and have fun shooting with a great group of guys and all were achieved with surprisingly good accuracy.
The load was 31.5 grains of Varget, CCI 400 primer, 80 grain Berger FB Bullet in the lands in Lapua brass.
The Rifle is a 17 pound F class and soon to be 600 yard benchrest gun. It has a Kreiger 30” long 8 twist.237 bore, Panda f class action, PRT Lowboy stock, Jewell trigger and NF 15x55 scope. The chamber was cut with a 6mm Dasher Norma reamer run in until a new piece of 6 BR Lapua brass will chamber. The end of the neck on the BR brass is what measures the head space. The neck holds the case from going forward when you fireform. As I understand it, this is what Bart Sauter used for his record setting BRA chamber. On a suggestion from a shooting buddy the barrel was marked BS BRA to designate it as Barts version of the BRA.
Great Web site, great information, keep up the good work.

Thank you
Tim Barber

 

[Thumper]

 

[boltfluter]

Nicely done. Enjoyed your story. It is a cool little case!!

Paul

 

[Mulligan]

6 BRA fireform Benchrest shoot

Saturday I went to a local 100 yard benchrest practice match near Grand Junction CO to fireform some BRA brass. I wound up with a .4366 AGG for 5 relays. I didn’t think that was bad for a thrown together fireform load with no load development or tuning.
The goal was to to fireform brass, break in the barrel and have fun shooting with a great group of guys and all were achieved with surprisingly good accuracy.
The load was 31.5 grains of Varget, CCI 400 primer, 80 grain Berger FB Bullet in the lands in Lapua brass.
The Rifle is a 17 pound F class and soon to be 600 yard benchrest gun. It has a Kreiger 30” long 8 twist.237 bore, Panda f class action, PRT Lowboy stock, Jewell trigger and NF 15x55 scope. The chamber was cut with a 6mm Dasher Norma reamer run in until a new piece of 6 BR Lapua brass will chamber. The end of the neck on the BR brass is what measures the head space. The neck holds the case from going forward when you fireform. As I understand it, this is what Bart Sauter used for his record setting BRA chamber. On a suggestion from a shooting buddy the barrel was marked BS BRA to designate it as Barts version of the BRA.
Great Web site, great information, keep up the good work.
View attachment 1085258 View attachment 1085259 View attachment 1085260
Thank you
Tim Barber

Good shooting Tim!!!!
with the mittens/gloves and other excuses..... you beat out some of the really good PPC shooters at the match. Nicely done!
There are several of us locals watching to see how that BS BRA works out this season.
Keep us posted please.
CW

 

[idahoorion]

Thumper, are you using a shortened dasher die to resize?

Idahoorion

 

[Thumper]

Thumper, are you using a shortened dasher die to resize?

Idahoorion

I sent 3 fired cases to Harrells Precision to fit a shortened die to the case. I have not received the die yet.

 

[Thumper]

Here is a group I didn't post from the same shoot last Saturday.
I had three fire form loads left at the end of the last rely so I went back to the sighter target and this nice group appeared. What a great day !!!

 

[chevytruck_83]

I don’t shoot Benchrest but while fire forming brass in my PRS style rifle in 6bra I shot these at 200 yards. I’m debating selling fire formed brass to keep shooting 6br brass out of it.

 

[Falfan2017]

Bout to fireform at a 600 club match this weekend. We shall see how it goes weather permitting.

 

[chevytruck_83]

Has anyone run fireforming loads through a chrono to see how the speed compares to the same charge weight after it’s formed? I would like to start my load development at the same speed as the fire forming loads. I’m just not sure exactly where that would be as far as charge weight. For example if 30.5 or varget with a 105 hybrid shot good and it got me to 3000fps(just for argument) what would the same lot of varget need to get the same speed after the case is fire formed?

 

[Dusty Stevens]

Has anyone run fireforming loads through a chrono to see how the speed compares to the same charge weight after it’s formed? I would like to start my load development at the same speed as the fire forming loads. I’m just not sure exactly where that would be as far as charge weight. For example if 30.5 or varget with a 105 hybrid shot good and it got me to 3000fps(just for argument) what would the same lot of varget need to get the same speed after the case is fire formed?

Your fireforming load will be slower since youre expending energy forming a case. It gives the bullet time to move farther before the expansion stops then pushes with full force. When a fireforming load shoots better than your formed load it means your formed load is going too fast

 

[chevytruck_83]

Your fireforming load will be slower since youre expending energy forming a case. It gives the bullet time to move farther before the expansion stops then pushes with full force. When a fireforming load shoots better than your formed load it means your formed load is going too fast

Thanks. I’m sizing fire formed cases and deciding where to start with the powder charge. Getting near the top of the cartridges velocity range doesn’t mean a whole lot to me. If I can save barrel life and get it to shoot like the fire forming rounds, I don’t care what the speed is.

 

[KenOath]

Has anyone run fireforming loads through a chrono to see how the speed compares to the same charge weight after it’s formed? I would like to start my load development at the same speed as the fire forming loads. I’m just not sure exactly where that would be as far as charge weight. For example if 30.5 or varget with a 105 hybrid shot good and it got me to 3000fps(just for argument) what would the same lot of varget need to get the same speed after the case is fire formed?

From memory I think I was getting high 2700s with 30gns of a Varget and 105s while ff...

 

[Willow]

I was getting around 2840fps with 29.5gr of RL15 during fireforming (30" barrel). 95gr vlds for that velocity too.

 

[JMayo]

My pet load is varget 30.6, berger vld105 & 108 fb ..
Jfyi

 

[Don Shelton]

I’m looking for help with RL15 fireform load with Berger 105 and 108’s... I shoot 600 and 1k benchrest....

 

[Jet]

29gr should get those shoulders where you need them

 

[bcarico]

I’m looking for help with RL15 fireform load with Berger 105 and 108’s... I shoot 600 and 1k benchrest....

If you live close to the range load one at 27 one 28 and one at 29. If 27 does the job load them all there if not 28 or 29. Hitting fire form loads harder than need be helps nothing and will lead to premature primer pocket failure.

 

[johara1]

6 BRA fireform Benchrest shoot

Saturday I went to a local 100 yard benchrest practice match near Grand Junction CO to fireform some BRA brass. I wound up with a .4366 AGG for 5 relays. I didn’t think that was bad for a thrown together fireform load with no load development or tuning.
The goal was to to fireform brass, break in the barrel and have fun shooting with a great group of guys and all were achieved with surprisingly good accuracy.
The load was 31.5 grains of Varget, CCI 400 primer, 80 grain Berger FB Bullet in the lands in Lapua brass.
The Rifle is a 17 pound F class and soon to be 600 yard benchrest gun. It has a Kreiger 30” long 8 twist.237 bore, Panda f class action, PRT Lowboy stock, Jewell trigger and NF 15x55 scope. The chamber was cut with a 6mm Dasher Norma reamer run in until a new piece of 6 BR Lapua brass will chamber. The end of the neck on the BR brass is what measures the head space. The neck holds the case from going forward when you fireform. As I understand it, this is what Bart Sauter used for his record setting BRA chamber. On a suggestion from a shooting buddy the barrel was marked BS BRA to designate it as Barts version of the BRA.
Great Web site, great information, keep up the good work.
View attachment 1085258 View attachment 1085259 View attachment 1085260
Thank you
Tim Barber

If you have a short chamber where the case mouth touches the end of the chamber it will make a shorter case than one that not touching. A 1.555 chamber length will have a blow length shorter than a 1.560 chamber with that is cleaned and dried and the cases cleaned and dried with non chlorinated brake cleaner.... As far as group size when I was fire forming the 12 twist barrel with Barts 80 gr. bt. it was holding a .1 in group size... jim

 

[Badbob]

Don't want to hijack this thread but I'm getting ready to fireform my 6bra brass. I have a used fireforming barrel chambered to my reamer (.104" fb). I have a couple boxes of 6mm 70g Sierras. Can I use up this old bullet stock to fireform? Was thinking of starting around 29g of Varget. Any help is mucho appreciato! BB