Chamber neck length on reamer grind?

[Nvreloader]

From the info I know now,
I basically have a choice to have my reamer ground in either of 2 versions, that being,

EDITED (with the correct info) Sorry for the confusion, :-[

1. A Standard SAAMI 280 AI with a .386" neck length/Total overall case length of 2.560",
(which will require the use of 280, 25/06 or 270 Win brass).

2. A Standard SAAMI 280 AI with a .312" neck length/Total overall case length of 2.502",
(for use with standard length 30/06 brass).

The only difference would be the .074" +/- difference in neck length, between the 2 reamers/chambers.

Question,
What would be the disadvantage/advantages of this .074" extra neck length??
Keeping in mind the availability of brass in "Todays" market.

I already have several hundred 06 brass available?

Give me your thoughts, suggestions or Ideas for either side??

Tia,
Don

 

[jonbearman]

PM expiper , he has his reamer ground to use lapua 30-06 brass, etc.

 

[fguffey]

require the use of 280, 25/06 or 270 Win brass.

The 25/06 case is a necked down 30/06 case, The 270 and 280 case are the same length. In the beginning there was a chance a 7mm could mistakenly be chambered in a 270 chamber. To protect the shooter from the shooter .051" was added to the length of the 280 Remington from the shoulder to the case head.

Then there is case forming and fire forming. I have had cases shorten .045" from start to finish. I start with long cases, I want my cases to cover the chamber. I have a 30 Gibbs that started out as a 30/06 chamber. When I went to 30/Gibbs the length of the chamber from the beginning of the throat to the bolt face did not change but when forming 30/06 cases the neck length of the case was .217". I started using 280 Remington cases, the additional length lengthened the case neck.

F. Guffey

 

[fguffey]

Then there is cylinder brass, R-P makes cylinder brass for wildcats, the case is straight wall with a length of 2.650", the case comes complete with a 35 Whelen head stamp.

F. Guffey

 

[CatShooter]

From the info I know now,
I basically have a choice to have my reamer ground in either of 2 versions, that being,

1. A Standard SAAMI 280 AI with a .560" neck length OR (which will require the use of 280, 25/06 or 270 Win brass.
2. A Standard SAAMI 280 AI with a .502" neck length, (for use with standard length 30/06 brass).

The only difference would be the .058" +/- difference in neck length, between the 2 reamers/chambers.

Question,
What would be the disadvantage/advantages of this .058" extra neck length??
Keeping in mind the availability of brass in "Todays" market.

I already have several hundred 06 brass available?

Give me your thoughts, suggestions or Ideas for either side??

Tia,
Don

How did you come up with your dimensions?

I am looking at the SAAMI drawings and your numbers do not make sense.

The SAAMI neck on the standard 280 Rem is 0.3676"

The SAMMI neck for the Ackley 280 AI is 0.386"

How are you coming up with necks that are 0.502" and 0.560" long?

Even the neck on the plain ol' 30-06 is only 0.402" long??

 

[fguffey]

Only a guess, someone is measuring from the case body/shoulder juncture to the mouth of the case. His measurements could include the shoulder and neck length. Then there is that part about using 280 Remington length cases or 30/06 length cases. I would choose the 280 Remington length case, if it is tool long, trim. Always a problem when the case is too short, adding to the length is most difficult.

F. Guffey

 

[Nvreloader]

Hey Guys,

Sorry for the confusion, fat fingers got mixed up and in the way again. :-[

I have EDITED the original post with the CORRECT info this time, I hope.

I am leaning towards the reamer with the .312" neck length, as I have "lots" of Win 06 brass,
and I really don't want to go thru the troubles/problems of finding new 280/270 brass in todays times with the lack of brass available etc.

Tia,
Don

 

[coford]

I would opt for the longer neck. Midway, Grafs, and Midsouth all have .280 Norma brass in stock. They also have Nosler 280 AI brass in stock.

 

[Nvreloader]

Gonzos

I already have several hundred 06 cases on hand, as the 06 is my favorite caliber I use etc.
and I won't use Norma brass as never had good results with that brand of cases in my reloading experiences etc.

Tia,
Don

 

[Ledd Slinger]

I think the 30-06 neck makes sense since you already have the brass. With careful and meticulous handloading, any cartridge can be made to shoot very accurately.

I do like the idea of the 280 AI as well. The Ackley shoulder really turns the 280 Rem into a different animal. You will usually see gains of +/- 150 fps over the standard 280 Rem with bullet weights across the board.

 

[Nvreloader]

LS
Dave Kiff sent me the reamer spec's, for the 280 AI but sized for use with 06 brass etc,
per him, I'll have approx 3-5grs more case capacity and still have approx .300 long neck etc.

Kinda the best of both worlds, and this case is going to be used in LA etc.

Tia,
Don

 

[Ledd Slinger]

LS
Dave Kiff sent me the reamer spec's, for the 280 AI but sized for use with 06 brass etc,
per him, I'll have approx 3-5grs more case capacity and still have approx .300 long neck etc.

Kinda the best of both worlds, and this case is going to be used in LA etc.

Tia,
Don

Sounds like you've got a winner!

I'll bet that would work out perfectly for you. Dave is great for whipping up cartridge designs to suit your needs. Like you said, best of both worlds

I think a 1 in 10" twist barrel is ideal for the 280 AI. Be able to use the 168gr Berger VLDs and lighter bullets with great accuracy

 

[Nvreloader]

LS
I am hoping the DK has one on the shelf,
I have a like new 1x9 twist, 7mm Mann test bbl for this new build,
if not, I'll just have to wait, so I am still prepping the brass,
to make everything the same and as close as possible.

Running some what if's, thru QL for the 130gr Speer FB,
I used in the 7mm Ugalde (TCU) case, have several hundred left over from the SILLY Wet days from the 70's.
I'll use them to FF the new brass and get the feel of this new SP pistol etc.

The better half brought home a couple of jugs of the newest RL-23 and RL-26 powders for this beast,
per QL, it looks like the heavier weights (150gr and up) will be perfect for this case,
providing the accuracy is there etc, only testing will it???.

Tia,
Don

 

[Ledd Slinger]

Being a fan of Alliant powders, I'd be really interested to hear you chronograph and accuracy results withe the new powders. Another option is RL-17. It will give you all the speed you can hope for in the 280 AI with all bullet weights. Good luck

 

[Nvreloader]

LS
From doing what if's thru QL,
RL-26 shows to gain 100+fps with the 160gr bullets, over RL-17 load,
same PSI for both loads etc, in the 280 AI case.

I can't wait for the reamer to get here,
come on Brown truck. ;D

Tia,
Don

 

[Ledd Slinger]

LS
From doing what if's thru QL,
RL-26 shows to gain 100+fps with the 160gr bullets, over RL-17 load,
same PSI for both loads etc, in the 280 AI case.

I can't wait for the reamer to get here,
come on Brown truck. ;D

Tia,
Don

That sounds very promising. Can't wait to hear your chronograph results. Take care