Thoughts on 6BR-AI reamer dimensions.

[Tim Singleton]

I guess the 2.5 lead is meant to work with the long secant ogive bullets
Learned something http://riflebarrels.com/a-look-at-bullet-ogives-and-chamber-throat-angles/

 

[Terry Altom]

Does anyone know if a smith has a reamer and can chamber for a Panda?

 

[lloydx2]

Nice catch, and good info Tim, Yes something to think about. May not be
optimal for the 105 hybrid and others alike

 

[SHall]

Resurected thread on reamer designs for the AI.
Samuel Hall

 

[X-Caveman]

Does anyone know if a smith has a reamer and can chamber for a Panda?

Have you tried Alex Wheeler? He's done Panda barrels for me without the action and they have screwed right on. I think he may have one of these reamers.

 

[Mulligan]

Tag

 

[Matt P]

This print shows a lead with 2degree 30min
Most others show a 1-30
I'm not sure what the thought is there

All of my long range reamers have a 2.5 degree lead, I find them more consistent performers. Originally I tested with VLD style bullets with good results so tried with SMK's and 108 BT's and had great results with those as well. It maybe a headspace (the one between the ears) thing but it certainly doesn't hurt performance.
Matt

 

[Terry Altom]

Well even thought the current Ackley is a great idea I just shortened mine up 62 thousands an I like what iam seeing on paper an load density I always ran my 6mm dasher at 2970 fps any way I am getting the same velocity node the gun wants to shoot with about 1.4 grs less powder. PS my measurement at 2oo line is about .471 an some changeView attachment 997716

Did that turn out very close to a BRDX?

 

[Cool Tool]

Did that turn out very close to a BRDX?

Mine is about 20thousands shorter than brdx

 

[Terry Altom]

Just to clarify, do you mean BRX or BRDX? I believe the BRX has a neck/shoulder junction in the same place as a Dasher, but the BRDX is only a little longer than a 6BR.

 

[Cool Tool]

Just to clarify, do you mean BRX or BRDX? I believe the BRX has a neck/shoulder junction in the same place as a Dasher, but the BRDX is only a little longer than a 6BR.

The BRDX is 1.1647 at the shoulder in length mine is 1.140 in length to the shoulder.

 

[Terry Altom]

The BRDX is 1.1647 at the shoulder in length mine is 1.140 in length to the shoulder.

Thanks for the clarification!

 

[Scarab]

I have a question about sizing die reamers. If your let's say .4695 at the .200 line and .463 at the shoulder what are the target measurements for a properly sized case?
Jeremy

 

[Alex Wheeler]

I have a question about sizing die reamers. If your let's say .4695 at the .200 line and .463 at the shoulder what are the target measurements for a properly sized case?
Jeremy

Those would be pretty bad numbers on a finish reamer. Custom die for sure in that case. I want .002" at the shoulder and minimum .0005" at .2" of actual sizing. You have to take the brass down smaller as it will spring back. How much? Good question.
.460 at the shoulder and .4714 at .2" works about perfect with a Harrell's D2.5 die. If your chamber measures .4695" there aint a die out there that I know of thats going to work for you.

 

[tclaunch]

I have a question about sizing die reamers. If your let's say .4695 at the .200 line and .463 at the shoulder what are the target measurements for a properly sized case?
Jeremy

.008" per inch body taper is needed for proper extraction.

 

[Scarab]

I've got some sticky bolt lift at 31.5gr Varget in my BR-AI. I'm not sure it's related to pressure is why I'm asking. Let me re measure

 

[Scarab]

.470 at .2" and .4625 at the shoulder. My sizing die sizes to .4695 and .460 at the shoulder. anything there that could cause a sticky bolt?

 

[Alex Wheeler]

That sounds ok. What barrel? Tried any other powders or lots? Neck clearance? Can a bullet side into a fired case neck?

 

[Scarab]

That sounds ok. What barrel? Tried any other powders or lots? Neck clearance? Can a bullet side into a fired case neck?

1.25 Brux
2 lots of Varget
.0035 neck clearance, bullets slide right in!

 

[tclaunch]

.470 at .2" and .4625 at the shoulder. My sizing die sizes to .4695 and .460 at the shoulder. anything there that could cause a sticky bolt?

You will need a custom FL size die with .470" @ .200". No way your die will work correctly. Alex has given good .200" line suggestions on the reamer, yours is very tight at .200" and will need a custom die for best results.