22-250 AI no turn reamer specs for Lapua brass?

[L.Sherm]

I would deal with either JGS or Manson on a reamer there both very helpful and could probably tell you what dimensions will suit the Lapua brass. JGS will send you a print to look at for approval and you can look at it then.

 

[Jim Mc]

CIP and SAAMI look the same to me. The only difference I see is rounding errors when switching between mm and inches.

Edd: Your right. I just went back and ran the numbers again. I used the taper and tried to determine what plus .073" was worth. If I did it right? the most I could get was +.0002 @ .127 up and yes I'm rounding some. If this is correct why are the CIP specs working for some?

 

[AlNyhus]

I much prefer .003" as my minimum. I have never understood the tapered neck in a modern bolt rifle, so why not call it .256" no taper and for that matter why the 2° throat instead of a more typical 1.5°?

The tapered neck in factory chambers is to help in extraction.
If I was having this reamer done for the Lapua case (wise choice), I'd specify the back end not less than .471 @ .200 and the neck non-tapered and .256.
That will give you .003-.0035 over the pressure ring and the .471 back end will be a great match with the Redding 22-250 AI f.l. dies.
Good shootin' -Al

 

[L.Sherm]

Al is spot on, if I was designing a 22-250 reamer with Lapua brass its exactly what I would spec.

 

[AckleymanII]

Lapua 22/250 brass, I figure a minimum of .00035 over the Web dimension as a minimum at the .200 line. , and I think that Al's dimension is about that. This web dimension thing is one thing that you do not want to screw up on.

Do your own measurements, verify your print. Reamer makers can be off .0005 in tolerances, as per their manufacturing standards.

The "Good Enough" or "Seems to Work" statements from a reamer maker got me into trouble twice on ordering reamers, never again.

 

[Idaho-Lefty]

Thanks, did .4695 @ .200 work well with a particular FL sizing die?

Forster Dies, ALWAYS work the BEST for, my Cartridges,..
.22-250 Rem, 6XC, 6.5 Creed and .270 WSM. ( all my other Dies, got Trashed ).
And they can be Custom Honed to any Neck Tension dia. that, you want !
NO Turn necks, need to be .003 to .005, "clearance" YUP,.. .004 is Perfect and .4695 to .471 at, the .200 Dim.
PS; Not all Brass, is created,.. "EQUAL" so, do your,.. "Homework" !

 

[AckleymanII]

22/250 CIP Reamer print from PTG, works well for my friend that ordered it using Lapua brass.

Print #43821 for CIP 22/250 AI with zero freebore

Change freebore amount for your needs This print works well for 55g-60g bullets.

Note the Web dimension from normal SAAMI spec!

 

[Jim Mc]

The tapered neck in factory chambers is to help in extraction.
If I was having this reamer done for the Lapua case (wise choice), I'd specify the back end not less than .471 @ .200 and the neck non-tapered and .256.
That will give you .003-.0035 over the pressure ring and the .471 back end will be a great match with the Redding 22-250 AI f.l. dies.
Good shootin' -Al

Thanks Al,
I spent a lot of time and money back in the day getting my PPC dies and reamers matched up before Harrell's started making them in various sizes. That's good to know about the 22-250AI Redding die and .471 @.200

 

[Jim Mc]

Lapua 22/250 brass, I figure a minimum of .00035 over the Web dimension as a minimum at the .200 line. , and I think that Al's dimension is about that. This web dimension thing is one thing that you do not want to screw up on.

Do your own measurements, verify your print. Reamer makers can be off .0005 in tolerances, as per their manufacturing standards.

The "Good Enough" or "Seems to Work" statements from a reamer maker got me into trouble twice on ordering reamers, never again.

Yep been there before!
I've got a box with a few reamers that didn't work out, most all of them are too small in the back end and no turns necks are under .002 clearance.

 

[Jim Mc]

22/250 CIP Reamer print from PTG, works well for my friend that ordered it using Lapua brass.

Print #43821 for CIP 22/250 AI with zero freebore

Change freebore amount for your needs This print works well for 55g-60g bullets.

Note the Web dimension from normal SAAMI spec!

Thanks, I'll see if I can get that print # coming to compare with # BOP-10895

 

[AckleymanII]

It would not hurt a thing going .4713 at the .200 mark!

 

[Edd]

Thanks, I'll see if I can get that print # coming to compare with # BOP-10895

I would like to see those prints. When you get them, would you post them.

 

[Jim Mc]

I would like to see those prints. When you get them, would you post them

Yes I'll try

 

[Jim Mc]

22/250 CIP Reamer print from PTG, works well for my friend that ordered it using Lapua brass.

Print #43821 for CIP 22/250 AI with zero freebore

Change freebore amount for your needs This print works well for 55g-60g bullets.

Note the Web dimension from normal SAAMI spec!

only PTG print with #43821 is a CIP 22-250 (non "AI") but at .1268 it's .4709
the BOP-10895 AI is a typical standard 22-250 AI reamer print and the JGS print is basically the same. I'm going to use this to mark up a new print with
.471 @.200
.256 / .256 no taper neck
1.5° throat angle (1°-30ft)
.020 freebore (can be throated longer if needed)

 

[Edd]

only PTG print with #43821 is a CIP 22-250 (non "AI") but at .1268 it's .4709
the BOP-10895 AI is a typical standard 22-250 AI reamer print and the JGS print is basically the same. I'm going to use this to mark up a new print with
.471 @.200
.256 / .256 no taper neck
1.5° throat angle (1°-30ft)
.020 freebore (can be throated longer if needed)

Thanks for the prints. That print #43821 converts to .468" @ .200.

I have the other print in its earlier format.

 

[Edd]

I much prefer .003" as my minimum. I have never understood the tapered neck in a modern bolt rifle, so why not call it .256" no taper and for that matter why the 2° throat instead of a more typical 1.5°?

You don't like the taper on a 22-250, look at it's parent.

 

[Jim Mc]

You don't like the taper on a 22-250, look at it's parent.

Amazing that so many older case designs had them with so much. Just not needed in modern bolt action rifles or gas guns. Battlefield rifles I can see the need possibly but that's about it.

 

[AlNyhus]

Significant case and neck taper helped with ejection in rifles that don't have the mechanical camming of a bolt gun.

The 250 Savage (originally called the 250-3000) was designed for use in the Savage 99, for example.

Good shootin' -Al

 

[Jim Mc]

Significant case and neck taper helped with ejection in rifles that don't have the mechanical camming of a bolt gun.

The 250 Savage (originally called the 250-3000) was designed for use in the Savage 99, for example.

Good shootin' -Al

Yes that's a very good example of why these type of designs were needed. I'm always somewhat surprised when many of the older SAAMI spec reamers shoot very well when given a good barrel and a good chamber job.

 

[AlNyhus]

I'm always somewhat surprised when many of the older SAAMI spec reamers shoot very well when given a good barrel and a good chamber job.

Yes....in a good bolt gun with proper chamber dimensions and good brass, they can shoot very, very well. Case stretch can be an issue. Careful die setup and quality brass somewhat helps that issue, though. -Al