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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