Factory 308 Match Ammo changes.

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Tony Q
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Factory 308 Match Ammo changes.

#1 Postby Tony Q » Sun Nov 20, 2005 9:28 am

I have heard, from a very solid sorce, that Winchester will no longer be producing NRAA factory ammo with the 155gn SMK as they are going to replace it with the Dyer projectile.

I was told the reason was batch lot variations with the sierra SMK’s being out of excepted tolerances … I have not heard this before and personally hold the SMK’s in very high regard.

Does anyone know anything to add to this???
MBRC F-Class standard ... and proud of it!

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#2 Postby Guest » Sun Nov 20, 2005 11:29 am

Tony Q,

Thats the story mate and it looks like that is what is going to happen.

Later batches of Sierras have Ogive length variations of up to 50 thou,box to box.

Like me I guess the factory get rather sick of changing their seating dies.

Dyers do not vary.( more than a couple of thou )

Barry Davies.

Tony Q
Posts: 1044
Joined: Mon Jun 20, 2005 8:04 pm
Location: Adelaide (MBRC)

#3 Postby Tony Q » Sun Nov 20, 2005 11:35 am

Thanks Barry

I hope no conflict of interest issues come to the table then with JD being on the NRAA (as its certainly a win fall for the Dyer's and is perhaps a deseved pat on the back for their dedication). Although the fact that they are in the SSR’s would have raised issues when they were included ….. maybe they did? (before my time)


The other thing i heard was Winchester producing 556 with the 80gn SMK and getting rid of the 69 gnr's.

If true this is a good move :D
MBRC F-Class standard ... and proud of it!

Trev Otto
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Location: South Australia

#4 Postby Trev Otto » Mon Nov 21, 2005 6:58 pm

Evening Tony,

The current information is as follows:

Dyer projectiles, new brass, Winchester lost their original source and quality appreared to deteriorate, will be Lapua maybe??? Powder will be Benchmark 2 for expected better metering. Availability will be mid next year, cost is expected to be about the same (due to cheaper projectiles).

Also being evaluated is an eighty grain nozler for the 556.

Trev

Ken L
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Location: Maclean NSW

#5 Postby Ken L » Tue Nov 22, 2005 3:32 am

The following was cut and pasted from the ADI Web site for the 308 W (7.62 Nato). Now if the information is correct and I have no doubts myself, then even with a maximum load and a longer barrel there may well be problems with getting enough velocity to handle 1000 yards at sea level on a day, with high barrometric pressure, and still stay out of the transonic turbulance range.
I am not aware that the BJD projectiles are better than average at handling the transition to subsonic witout destabilising in a 1:13 twist barrel and a 1:14 would be potentialy less stable at 1000 yards.

ADI Data from http://www.adi-limited.com/handloaders-guide/rifle.asp

Powder Start load FPS Max FPS
155 Bench Mark 2 39.0 gn 2538 fps- 43.0gn 2753 fps-
155 AR2206 40.0 gn 2539 fps- 44.5 gn 2825 fps-
155 AR2206H 43.0 gn 2735 fps- 46.0 gn 2873 fps-
155 AR2208 44.0 gn 2759 fps- 47.0C gn 2909 fps-

Regards
Ken L

Triplejim
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#6 Postby Triplejim » Fri Nov 25, 2005 6:31 pm

The current situation is the NRAA are to commence the second test of Winchester factory ammunition with Dyer projectiles when new cartridge cases arrive in December.

Current cases are sourced by Winchester, new trial cases are manufactured by Winchester with .015" side wall thickness and combined with a proper seating depth of the projectile should give us bullet pull figures that allow us to delete the neck tar.

The trial is using BM2 as this meters under .2g and quite often under .1g. All the data from ADI Mulwalla suggests the velocity will be suitable back to 1000 yards.

Winchester have upgraded the powder hopper at the Geelong factory and also installing an electronic eye to detect cases without a primer flash hole.

NRAA are replacing their test equipment at Winchester with an RPA action and 4 Kreiger barrels that are excess from the last Australian team barrel program. This will give us more accurate data relating to velocity through 30" barrels.

At present, a program of testing the Nosler 80g projectile is under way and if successful and approved, it will allow shooters a choice of a second projectile in this calibre. The next step is to produce factory ammunition in 223 caliber with a 80g proj. James

John T
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Location: Brisbane

#7 Postby John T » Sun Jan 08, 2006 2:18 am

KEN L

Those mv's are for a 24" barrell. A fair rule of thumb is to add 20fps per inch, eg, +80fps in a 28" barrel.
An mv of 2895 for the 155smk would still have 1200fps at 1000 into a 20mph head wind, according to the Oehler Ballistic Explorer.

david262
Posts: 5
Joined: Sun Jan 08, 2006 3:54 pm
Location: north coast nsw

#8 Postby david262 » Sun Jan 08, 2006 4:33 pm

just a question . if the new ammo is loaded with dyers , will the overall
length be reduced . the ogive shape is a fair bit different . we have had
club members using dyers seated to a similiar length to the sierra leaving
projectiles stuck in the barrel if they have to unload . with the projectile
seated deeper will there be enough room for the required quantity of powder.


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