6 Dasher reamer for Alpha brass

[Ajwilly96]

Just a general question because I’m looking at having a reamer designed for alpha. Would there be any downsides to getting a 0 FB reamer and having a quality smith use a throating reamer to match a bullet?

My thought is I can have one reamer that I can use for several different bullets with since the reamer itself has 0 FB

 

[LRPV]

Just a general question because I’m looking at having a reamer designed for alpha. Would there be any downsides to getting a 0 FB reamer and having a quality smith use a throating reamer to match a bullet?

My thought is I can have one reamer that I can use for several different bullets with since the reamer itself has 0 FB

Yes that would work fine. Using a throater can be hard to get precise results from what I’m told and I’ve had very good Smiths tell me they like the finished product from a reamer itself. But, it can certainly be done.

 

[Kings X]

Just a general question because I’m looking at having a reamer designed for alpha. Would there be any downsides to getting a 0 FB reamer and having a quality smith use a throating reamer to match a bullet?

My thought is I can have one reamer that I can use for several different bullets with since the reamer itself has 0 FB

I see two options.
Get a reamer with a lead - but short for BR bullets. Say .040".
Then get a throating reamer. Have the smith make a "hard stop" for it. That way the next barrel will have the same lead.
FYI My reamer is a JGS Dowling original with .040" FB. I shoots the 105 Hybrids.
Clif has an Alpha supplied reamer. Jose has his own reamer.
I don't have their prints, but they all shoot 105 - 109s.

 

[Texas Solo]

My Dasher uses Alpha brass. No turn. Loaded round is .269. My PTG reamer chamber is .272. I've never had an issue. It chambers like butter and seals the chamber very well.

 

[cp255]

I used alpha brass in my dasher they suck heavy bolt lift ejector marks went to lapua no more problems also with alpha I had to run at 6br powder charges why go dasher with alpha brass and get 6br performance waste of time just use lapua brass problem solved with regular reamer.

This is EXACTLY what happens to me with my proof research TL3 prefit. Just tried fire formed lapua. Problem solved.

 

[Belly Benchrester]

This is EXACTLY what happens to me with my proof research TL3 prefit. Just tried fire formed lapua. Problem solved.

Glad you listen to someone! LOL

 

[Scooby-93]

This is EXACTLY what happens to me with my proof research TL3 prefit. Just tried fire formed lapua. Problem solved.

Did you use a mild load initially in the brass for the first firing or go straight to your normal loads?

I have found with alpha, if I try step on the virgin brass with higher chargers I get pressure signs, once fired brass I have been able to run a lot higher charges before signs of pressure.

Can you recall your virgin vs fired .200 dimensions?

 

[JLT]

This is EXACTLY what happens to me with my proof research TL3 prefit. Just tried fire formed lapua. Problem solved.

Curious. I have had no problems at all with Alpha brass in any of my four Dasher barrels. I can go from Lapua to Alpha with no issues whatsoever. The loads are different, of course, due to Alpha's smaller capacity, but I can run the Alpha brass at the same velocities (~2,975) as the Lapua with no drama at all. My reamer is ground for Lapua brass with a .150" leade - no unusual geometry.

 

[cp255]

Did you use a mild load initially in the brass for the first firing or go straight to your normal loads?

I have found with alpha, if I try step on the virgin brass with higher chargers I get pressure signs, once fired brass I have been able to run a lot higher charges before signs of pressure.

Can you recall your virgin vs fired .200 dimensions?

I did. The issue was way worse on newer brass. Still running into pressure signs thought and I have around 7 firings on each case. I was only running 31.4gr Varget and getting heavy bolt lift.

 

[good2go4it]

Does anybody have a reamer print for the Alpha Dasher. Legacy Reamer.

 

[cheyenne01]

I have the print for the Aplha team reamer.

 

[AM_ARixon]

Attached is a 130 FB Dasher reamer, if you need a different one let me know and I can send it over, you can email me at andrew@alphamunitions.com.

Typically, if our brass has an issue in a chamber, it's because the base is opened up on the chamber either because there is a trend of increasing the base diameter of a reamer (which is the worst possible thing to do) or because of misalignment between the tool and chambering process cutting a larger diameter body. Opening up the base is an issue as the case head hardness we have minimizes deformation at the base, so if the chamber is oversized then we do not grow to the side walls and transfer force to the camber. Not transferring force to the chamber walls increases bolt force and gives signs of overpressure where the actual issue is chambers being oversized, that or the coefficient of friction is too low causing the same increased bolt force.