30br reamer?
- Thread starter TrxR
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PTG HAS A REAMER JACKIE SCHMIDT uses.
jackie has done well
but it is based on long fire formed brass
jackie has done well
but it is based on long fire formed brass
Butch Lambert
Active member
I think PT&G has the Robinett reamer. I like it.
jackie schmidt
New member
What has became the "standard Robinett" reamer is not exactly what Randy initially designed, but it gets the job done. People have just got into the habit of calling a "zero" freebore with around a 1.500 trim to length a "Robinett".
.330 neck, "zero" freebore, 1.5 degree lead, and a trim to length at about 1.505. Pretty generic stuff, but as I said, it gets the job done.
The difference in my reamer and the standard is a product of the way I make brass. I blow them out rather than neck them up in steps. This results in a case that retains much of the original 6BR length, about 1.540 in length. My chambers overall length is 1.550 I had a reamer ground and put on file to accomadate this rather than trimming all of that metal off.
I really wish Lapua would come out with a 30BR case. Life would be easier.
.330 neck, "zero" freebore, 1.5 degree lead, and a trim to length at about 1.505. Pretty generic stuff, but as I said, it gets the job done.
The difference in my reamer and the standard is a product of the way I make brass. I blow them out rather than neck them up in steps. This results in a case that retains much of the original 6BR length, about 1.540 in length. My chambers overall length is 1.550 I had a reamer ground and put on file to accomadate this rather than trimming all of that metal off.
I really wish Lapua would come out with a 30BR case. Life would be easier.
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jackie schmidt
New member
No its just some of the locals have had some poor luck and customer service from PTG and they can be hard to deal with from Canada.
Thanks
jackie schmidt
New member
JGS certainly makes top of the line reamers.
I just got my new 30 BR reamer in from JGS (my go to reamer people for years) and
I specked it with a .332 nk and 0 Leade I also tighten the .200 diameter a skosh cause I like the way that has worked on my other BR cartridges with the current Lapua brass.
Just chambered the first of 2 1-17 Krieger HV's over the weekend, plan on fireforming and load testing this coming Friday.
One mans opinion, worth what I charge.
Greg
When you say 0 leade is that the same as freebore? What weight bullet do you run?
Ok now you done it!
You have brought up one of my pet peeves, the way a lot of people use the term freebore. (The other one is "jam")
The term freebore is totally dependent on the particular bullet that is being used, seated to a particular depth.
You could also call it "jump" if you will.
Leade is an actual measurement based off of a datum on a specific chamber print without any reference to bullet.
Most people interchange the 2 without understanding the difference.
My new JGS reamer has 0 leade, and I use the 115gr Berger FB Target.
I normally jam these (so no "freebore") although I have not worked this up yet in the new barrel.
Sorry for the rant, not directed at anyone in particular, It's just that I have actually had to ask supposedly knowledgeable shooters to show me a chamber print with the term "freebore on it, as I have never seen one.
Regards,
Greg
jackie schmidt
New member
Mr. WFCustom, that is just wrong.
The freebore in a chamber has nothing to do with a loaded round. It is built into the reamer. It is simply that space between where the neck ends and the lands begin. Most reamers have it at around .0005 to .001 above the bullet diameter.
A longer freebore simply means you have to seat a Bullet further out in the neck in order to make contact with the lands as opposed to a shorter freebore. The longer the freebore, the further you have to seat a given bullet out in order to touch the lands.
We use a "zero" freebore in our 30BR's so we will have a reasonable amount of a 112 grn 30 caliber bullet in the neck when the ogive is just contacting the lands.
Now, I know that on our reamer prints, it calls this the lead, but on the reamer, it's stamped FB.
http://benchrest.com/attachment.php?attachmentid=21844&stc=1&d=1545947535
The freebore in a chamber has nothing to do with a loaded round. It is built into the reamer. It is simply that space between where the neck ends and the lands begin. Most reamers have it at around .0005 to .001 above the bullet diameter.
A longer freebore simply means you have to seat a Bullet further out in the neck in order to make contact with the lands as opposed to a shorter freebore. The longer the freebore, the further you have to seat a given bullet out in order to touch the lands.
We use a "zero" freebore in our 30BR's so we will have a reasonable amount of a 112 grn 30 caliber bullet in the neck when the ogive is just contacting the lands.
Now, I know that on our reamer prints, it calls this the lead, but on the reamer, it's stamped FB.
http://benchrest.com/attachment.php?attachmentid=21844&stc=1&d=1545947535
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Jackie,
I certainly respect your opinion, and will admit you have more experience and are probably much more knowledgeable about these things then I am, but the measurement you are referring to between where the neck ends and the lands begin is called leade and is so referred to on the print.
I have still yet to see the term "freebore" on a reamer or chamber print.
Maybe I am buying my reamers from the wrong people.
Respectfully,
Greg
jackie schmidt
New member
I posted a picture of my favorite 6PPC reamer, which I ordered with a .050 freebore.
If you are at a match, and another shooter asks me, "what is the freebore on your reamer", I know exactly what he wants to know.
The same discussion arises when the term "headspace" is used. Everybody knows that it is a set dimension from a given point to a specific line on a print. But, if a shooter asks another shooter,...."hey, how much headspace are you giving that", we all know that he is asking what, in thousandths of an inch, the distance is from the face of a loaded round to the actual bolt face.
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Jackie,
We are probably talking semantics here.
But rereading my post I see where what I was trying to say was misstated.
The point I was trying to get across is the way most people use the term freebore it is not based on an actual measurement "leade" but some mythical measurement based on the specific bullet they are using. (ie: I need a long/short freebore.)
This is why if they want to use a particular bullet, at a particular seating depth, I will send a sample round to the reamer mfg to set an appropriate leade (or freebore if you will) based on that round.
I wasn't trying to start an argument, and apologize for any confusion I may have caused to the OP.
Respectfully,
Greg
PS: My favorite 6PPC reamer has an .030 leade.
We are probably talking semantics here.
But rereading my post I see where what I was trying to say was misstated.
The point I was trying to get across is the way most people use the term freebore it is not based on an actual measurement "leade" but some mythical measurement based on the specific bullet they are using. (ie: I need a long/short freebore.)
This is why if they want to use a particular bullet, at a particular seating depth, I will send a sample round to the reamer mfg to set an appropriate leade (or freebore if you will) based on that round.
I wasn't trying to start an argument, and apologize for any confusion I may have caused to the OP.
Respectfully,
Greg
PS: My favorite 6PPC reamer has an .030 leade.
Jackie,
I get where you are coming from here, but the problem I would have with that is that my answer would only be good for my action unless I referenced it to a specific. ie: I am .002 over my go gauge (my preference on the 6PPC and most other "accuracy cartridges).
I have 4 actions from the same custom mfg, and they are all slightly different measuring 1.073 to 1.0745 from action face to bolt face. I "headspace " my barrels accordingly. I have a couple of customers that spec a specific measurement over the go gauge when I do their barrels.
Anyway, like I said probably semantics, would have been better if I had answered the original question with a simple yes.
Just me being anal I guess.
Greg
R.G. Robinett
"That'll never work."
Greg, respectfully, perhaps the "confusion" is the result of industry definitions (re-loading manuals) - mine go back 54 years - the definitions of free-bore, leade, and throat are, in every manual, listed as synonymous.
From then, until now, the three terms, have remained synonymous; usually reading something like, "the unrifled section of the bore ahead of the chamber. See Chamber, Leade or Throat." Then, when one looks up one, followed by the [other] two, they are defined something like this: "Leade: Free-bore; the unrifled bore immediately in front of the chamber." The Speer #7 manual I just grabbed (it was handy) defines Throat: That area of the bore immediately ahead of the chamber; tapers to the point where the rifling starts. Also, "Leade" or "Freebore". Under "Leade", the Speer #7 directs the searcher to "Throat".
Under Freebore: the distance, if any, which the bullet travels upon firing before it contacts the rear portion of the rifling. See "Leade". As Jackie stated, when these terms come up, we all know what's being discussed. RGI yield to superior firepower
Randy,
It wasn't bad enough I have Jackie on my case now I have the Godfather of the 30 BR weighing in?
Seriously though, I do appreciate you weighing in on this and i guess I just have to accept the fact that we are all talking about the same measurement with different names.
Those who know me say that acceptance and tolerance are my finest qualities!
I think my "confusion" stems from the fact that it was drilled into me many years ago by my Machine Technology professor to use proper terminology when describing something finite such as measurements,specifactions, tolerances, etc.
Of course this was the same professor who handed me an engineers drawing with MIL-TFD in the tolerance column.
When I told him I had no idea what type of spec that was, assuming it was some sort of Military specification, he told me it meant "Make it like the f****ng drawing."
On a more positive but related note I fire formed 100 cases in the new Krieger 1-17 barrel this morning chambered with my new 0 FREEBORE (see I can be retrained)
JGS reamer, and it was shooting pretty consistently (big 1's small 2's with the occasional outlier) with a f/f load of 33 gr 4198 and a mixture of your 118's and Berger 115's.
I will chamber it's twin up this weekend and then we will tune them up for next year. I am going to try one of Mike's tuners on them based on the results I have had with them on my 6 PPC's.
Regards,
Greg
Randy,
It wasn't bad enough I have Jackie on my case now I have the Godfather of the 30 BR weighing in?
Seriously though, I do appreciate you weighing in on this and i guess I just have to accept the fact that we are all talking about the same measurement with different names.
Those who know me say that acceptance and tolerance are my finest qualities!
I think my "confusion" stems from the fact that it was drilled into me many years ago by my Machine Technology professor to use proper terminology when describing something finite such as measurements,specifactions, tolerances, etc.
Of course this was the same professor who handed me an engineers drawing with MIL-TFD in the tolerance column.
When I told him I had no idea what type of spec that was, assuming it was some sort of Military specification, he told me it meant "Make it like the f****ng drawing."
On a more positive but related note I fire formed 100 cases in the new Krieger 1-17 barrel this morning chambered with my new 0 FREEBORE (see I can be retrained)
JGS reamer, and it was shooting pretty consistently (big 1's small 2's with the occasional outlier) with a f/f load of 33 gr 4198 and a mixture of your 118's and Berger 115's.
I will chamber it's twin up this weekend and then we will tune them up for next year. I am going to try one of Mike's tuners on them based on the results I have had with them on my 6 PPC's.
Regards,
Greg
Randy,
It wasn't bad enough I have Jackie on my case now I have the Godfather of the 30 BR weighing in?
Seriously though, I do appreciate you weighing in on this and i guess I just have to accept the fact that we are all talking about the same measurement with different names. Greg
Along with 'free bore', 'leade' and 'throat', an old, old Herters loading manual refers to it as the 'cylinder' and 'cone'...both used interchangeably...and both terms generally associated with revolver/pistol terminology.
If you really want to have some fun, ask someone what the free bore diameter of their 'zero freebore' chamber is.
Shoveling in The Forbidden Zone.
-Al