350 Legend Specifications

Last week I reported on the little bit of information I had learned at SHOT Show concerning Winchester’s new offering, the 350 Legend.  You can find that article here:  350 Legend and Reloading (SHOT Show)

Since that time SAAMI has posted their drawings online.  I also have some of the brochures I brought home from the Winchester booth, so let’s talk numbers.

Case Dimensions

There has been speculation that we might be able to load this new round in .223 Remington based brass, especially Starline’s offering of 223 Basic.  Now that we can see the numbers listed on the SAAMI drawing I question whether or not that will be a viable option.  You can find the actual SAAMI spec sheet here:  https://saami.org/wp-content/uploads/2019/01/350-Legend-Public-Introduction.pdf

 

350 Legend Specifications 3

When we compare the drawing for this with the drawing for .223 Remington we can see that everything from the base of the case to the arrow at letter A is identical.  The measurements at letter B are different however.  At this point the 223 case measures .3759″ while the 350 case measures slightly larger at .3900″.  That may not seem like much of a difference, but it’s significant enough that using 223 brass in the 350 chamber could possibly result in a blown case head.  The 350 Legend is rated at a maximum average pressure of 55,000 psi.

The case mouth, labeled C in the image above, measures .3780″, and the case length is 1.710″.  (The case length for 223 is 1.760″.)  The 350 minimum cartridge overall length is 2.125″ and the maximum is 2.260″.  (The minimum for 223 is 2.165″, and the maximum is 2.260″.)  The bullet diameter is listed as .3570″

Velocities and Energy

The following information comes straight from the marketing brochure that Winchester provided.

They claim that the 350 Legend has “more energy that 30-30 Win., 300 Blackout and 223 Rem.”  They included a chart with that claim that shows a 200 yard energy comparison.  The 300 Blackout data was with a 16″ barrel, and the rest were with 20″ barrels.  the 350 is listed as 903 ft-lbs, while the 300 Blackout is listed as 790, the 30-30 Win is listed as 781, and the 223 Rem is listed as 603.  (They do not specify what the various test bullets or loads were.)

It’s the “fastest straight-walled hunting cartridge.”  Here’s the velocities they provided:

  • 145 grn FMJ – 2,350 fps
  • 150 grn Deer Season XP – 2,325 fps
  • 265 grn Super Suppressed – 1,060 fps
  • 160 grn Power Max Bonded – 2,225 fps
  • 180 grn Power-Point – 2,100 fps

The SAAMI sheet lists 145 grn at 2,250 fps from a 16″ test barrel with a 1:16 twist.

It has “approximately 20% less recoil than 243 Win with 20% more penetration.”  And, it has “less recoil than 450 Bushmaster.”  They have a couple charts that show recoil numbers with 7 lb rifles, and then a chart showing 20% gel penetration numbers at 200 yds.

Legend?  It will be interesting to see the reports once this makes it to the market and to the field.

 

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Eddystone3006
Eddystone3006

‘The bullet diameter is listed as .3570″’
Why are people Dancing around the fact that the actual bullet diameter is smaller than that? Why didn’t you measure the bullet?

rapscallion
rapscallion

350 Legend???? I thought that was the old 35 Rem! I guess we will see this reinvention of the wheel as long as someone out there keeps it profitable for the Gun makers and the ammo and reloading people. I am curious about the bullet specs and who is likely producing them…..does WinchesterOlin still make their own????

Thanks for having me here…..great site!

kdavey24
kdavey24

Referencing the .223 case head, you state “At this point the 223 case measures .3579”. SAAMI specs show that the case head diameter of a .223 is .376.

lonewanderer360
lonewanderer360

I’m interested in this and love seeing new stuff come out, but I think I’ll let you suckers… Er… I mean experts play with it for a while first.

rebel
rebel

Headspaces off the rim- yuk.

Thomas Pickering
Thomas Pickering

Interesting. I think I’ll give it a couple years, though.

livincincy
livincincy

Lawyers designed the ‘B’ Dimension so Winchester will be protected. I respect that they needed to considering the climate they do business in. Not good for the Frugal Hand Loader (FHL is similar to the EARRL but is more confusing and sounds like a PBS show ). I think your desire to use your 38/357 Boolit Molds and that you are a paid shill for the Big Bacon & Make Bacon Great Again Syndicate is why you posted this. You would just rather spend $$$ on bacon than an obscure set of molds good for only (1) Rifle caliber. That… Read more »

GunFun ZS
GunFun ZS

Winchester techs designed this, not lawyers. I am sure they wanted it to be proprietary, but I think that is more about branding and ease of product support than any fear of liability.

lanenebraska
lanenebraska

Looks like Winchester borrowed this idea from some wildcatter’s :

https://www.youtube.com/watch?v=-rKaFNrIXCI

https://www.youtube.com/watch?v=W6OfVK_kmzA

https://www.youtube.com/watch?v=gpfhgEgjs5s

Something old is new again? But should help the rest of us that want to start-up with this concept 😉

GunFun ZS
GunFun ZS

Neat. I was getting fairly interested in .358 YETI, but this looks better than I thought it would. Is there a reasonably priced source of barrels?

cup4joe
cup4joe

I had been reading about this 357-233 or 357 ar wildcat. Bellm had a write up on the 357 legend that referenced it and that’s how I heard about it. The nice thing about the wildcats vs the Winchester is that depending on your breech and throat configuration, you should be able to safely chamber and fire 38 special, 357 magnum and 357 max in the 357-223 chamber that bellm and others worked on. In an ar for example, swapping out to a 6.5 Grendel bolt should be all you need to make it a single shot in the 38/357… Read more »

unicoi
unicoi

Thanks for the close up pics bacon. Looks like a rebated rim cartridge. Going to be interesting to see how this cartridge pans out..

CharlieBrassStuffer
CharlieBrassStuffer

That base of the .223 looks like it will produce loose primer pockets very soon…just a thought?
As far as the rest of the numbers go…it’s too soon to tell until some reloaders get their hands on the new gizmo.