The difference is in where the measurement is taken. The standard 280, in an AI chamber, contacts the chamber basically at the neck shoulder junction. The SAAMI Nosler, at the datum. Trust me. If you can't do that then measure it before arguing with me on this. Sure, as with any wildcat, the reamer can be stopped pretty much wherever you want it to, but it was Ackley's design and widely accepted practice, that .004" shorter than a standard chamber GO gauge was how it should be done.
As for the dies, tell me the difference in a 6BR and a 6BR Norma. It's a simple re-naming.
Did you even watch the video or do you just refuse to admit being wrong?
Would it help if I mention that I believed the same thing until Jim Borden had the same discussion with me as I'm having with you? I happened to have everything handy to verify what he was telling me while we were on the phone. Danged if he wasn't right.
I watched (terrible music)... Sorry, but no cigar. You are mistaken. You are doing your customers a disservise by chambering for the old, non-SAAMI version.
An email I received from Redding:
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Jessie,
SAAMI approved the 280 Ackley Imp cartridge in 2008. Prior to 2008 the most common wildcat design was
.014" longer than this adopted version. I have pasted below a link from the Nosler web page that may better explain.
http://faq.nosler.com/index.php?action=artikel&cat=32&id=39&artlang=en&highlight=280+ackley+
Redding currently is producing dies for the SAAMI approved version.
If an individual has the more common wildcat version rifle (not the SAAMI version) we have produced a +.014" shellholder. By using the SAAMI approved dies along with this shellholder, fired cases for the wildcat version can be sized appropriately.
Let me know should you be left with more questions after reading the link.
Thank you for using Redding Reloading Equipment.
Have a nice day,
Scott Lawrence
Customer Service Supervisor
cssl@redding-reloading.com
www.redding-reloading.com
1089 Starr Road
Cortland, NY 13045
(607) 753-3331
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The Nosler link...
The 280 Ackley Improved – which version do I have, and is it ok to shoot with factory ammo?
There have been many variations of “improved” cartridges over the years, and even several different flavors within the “Ackley” cartridges. The 280 is certainly no exception. When the 280 Ackley Improved was developed and standardized through the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) by Nosler®, the decision was made to honor Mr. Ackley’s original design intent by headspacing the cartridge such that standard 280 Remington ammunition would chamber with slight (.003”/.004”) crush at the shoulder/neck intersection and fire form into the Ackley chamber without the need to seat the bullet into the rifling. In fact, Mr. Ackley headspaced his “improved” cartridges by simply grinding a standard “go” headspace gage for the parent cartridge back by 0.004” and using it to headspace the new version. This is also the way that many large custom gun shops have chambered the 280 Ackley for almost 40 years. In order to achieve this, any standard 280 Remington firearm being opened up to the Ackley must have the barrel set back one turn prior to reaming the chamber – simply improving the standard chamber without doing so will yield excessive headspace, even though this was common practice for many gun makers over the years as well. Based on this design, the 280 Ackley Improved was accepted by SAAMI in February of 2008 and has enjoyed tremendous success ever since.
Occasionally, a rifle that was “improved” by simply reaming the chamber without first setting the barrel back will turn up and result in questions about its compatibility with factory ammunition. Unbeknownst to their owner, most of these guns have headspace dimensions of between 0.010” and 0.015” greater than the SAAMI version of the 280 Ackley Improved. These rifles are perfectly functional so long as they are used with ammunition that has been properly formed and sized to fit their chambers. If the customer wishes to use their rifle with modern SAAMI-compliant 280 Ackley ammunition, it must be re-headspaced to properly chamber the ammunition.
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And the SAAMI drawings:
!!
!! He had an identity and sex change and became Yosemite SAAMI!? Now I'm falling into the post hi-jack! Sorry there's folks here that actually help!
