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284 Winchester Ammo 2026: Federal Custom Shop Loads and SAAMI Specs

By , EditorUpdated How we verifyEditorial standards

We checked 2 current .284 Winchester loads on Federal's own product pages on November 5, 2026: 2 from Federal. The bullet weights, velocities, energy figures, test barrels and statuses below are copied from the maker pages. We don't use retailer prices or third-party ballistics. This is a comparison of popular loads from 1 makers, not every .284 Winchester load sold.

Federal and Remington loads show the usage label each maker prints on its own page, copied as written. The Cartridge column shows the name the maker page uses.

Federal loads

Figures are copied from each maker page. The usage label is the maker’s own wording.

LoadCartridgeItem #BulletMuzzle velocityMuzzle energyTest barrelBoxMaker usage labelMaker status (Nov. 5)
Federal Custom Shop Custom Rifle Ammo284 WinFCS284WFS1140 gr Fusion Soft Point2,900 fpsNot listed on maker pageNot listed on maker page20Available
Federal Custom Shop Custom Rifle Ammo284 WinFCS284WTT1140 gr Trophy Bonded Tip2,900 fpsNot listed on maker pageNot listed on maker page20Available

Velocity and energy are the muzzle figures in each maker's ballistics table. Test barrel is the length the maker lists. "Box" is the round count per box. Status is the maker's own wording on its product page, and it changes daily. All pages checked November 5, 2026.

Which bullet weight? What the makers' numbers show

Loads in our tables run from 140 gr to 140 gr. The lightest are Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WFS1) and Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WTT1), and the heaviest are Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WFS1) and Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WTT1). The fastest listed muzzle velocity is 2,900 fps, Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WFS1) and Federal Custom Shop Custom Rifle Ammo 140 gr (FCS284WTT1), with no test barrel listed. Muzzle energy is not listed on these pages. Because test barrels differ or are not listed, compare across makers with care.

The makers label loads for game or for target use. They don't tell you one weight is right for a species. The right choice depends on bullet construction, range and your state's rules. Check your state hunting rules and your state wildlife agency before you buy.

Barrel length matters: the test barrels

Muzzle velocity depends on barrel length, so compare loads tested on the same barrel. Of the 2 loads, 2 list no test barrel. The loads with no test barrel are from Federal. A rifle with a shorter barrel than the maker's test barrel will likely give lower velocities than the box. SAAMI's test barrel for the .284 Winchester is 24 in.

No barrel-length-velocity page exists yet for the .284 Winchester, and we have not charted one. Our barrel length vs velocity data covers other cartridges, so do not read those numbers as .284 Winchester data.

.284 Winchester: what SAAMI lists

SAAMI lists the cartridge as "284 WINCHESTER [284 WIN]" in ANSI/SAAMI Z299.4, its centerfire rifle standard (approved Feb. 10, 2025). The cartridge drawing was issued 05/29/1979 and revised 05/05/2022. SAAMI lists a maximum average pressure of 56,000 psi, measured by transducer (the table shows 560 in psi/100). SAAMI also lists a crusher maximum average pressure of 54,000 CUP (the table shows 540 in CUP/100). Cartridge overall length runs from 2.765 in minimum to 2.800 in maximum. Case length is 2.170 in (−.020). The drawing shows 6 grooves and a twist of 1 in 10.00 in, right-hand (marked optional). Bullet, bore and groove diameters are Not yet verified, because the PDF text does not pair each figure with its label clearly. SAAMI reference velocities are Not yet verified, because the PDF text does not clearly pair each bullet weight with its velocity. Read the standard at the SAAMI Z299.4 PDF. The .284 Winchester MAP row is also on our SAAMI maximum average pressure table (Z299.4, 56,000 psi / 560 psi/100).

SAAMI says all standard rifle test barrels are 24 in long and that exterior ballistic data for centerfire rifle cartridges is based on that length. Its listed exceptions (7.62x39, 277 Sig Fury, 30 Carbine, 300 AAC Blackout, 300 HAM'R, 350 Legend, 350 Remington Magnum, 360 Buckhammer, 400 Legend and 44 Remington Magnum) do not include the .284 Winchester, so SAAMI measures it on a 24 in barrel.

Not yet verified

These makers and loads are not in the tables.

Rifles for .284 Winchester

The .284 Winchester is a rifle cartridge, and the loads in the tables run from 140 gr to 140 gr. See also new rifle releases and the new hunting rifles of 2026.

Where to buy

We link only to maker pages, listed in the sources below. The maker pages show availability where noted in the table. We don't track retailer stock or prices. Before you order, check your state's ammunition rules, because some states require a background check or restrict shipping.

For more ammo, see 7mm-08 Remington ammo, 6.5 Creedmoor ammo, .280 Remington ammo, .270 Win ammo, .308 Win ammo, 7mm Rem Mag ammo, .260 Remington ammo, .30-06 Springfield ammo, the SAAMI maximum average pressure table, the barrel length vs velocity data, new ammo for 2026 and all ammo releases.

Frequently asked questions

What is the SAAMI maximum pressure for .284 Winchester?
SAAMI lists a maximum average pressure of 56,000 psi for .284 Winchester, measured by transducer, in ANSI/SAAMI Z299.4 (the table shows 560 in psi/100).
What grain is .284 Winchester ammo?
In our tables the bullets run from 140 gr to 140 gr. Check your firearm maker's manual for what your rifle is set up to shoot.
How fast is .284 Winchester ammo?
In our tables, listed muzzle velocities run from 2,900 fps to 2,900 fps. Test barrels vary, and some maker pages list none. See the test barrel section of this guide.
What does test barrel mean?
It is the barrel length the maker used to measure the listed velocity. A shorter barrel will likely give lower velocities than the box.
Do you list prices or stock for .284 Winchester ammo?
No. We link only to maker pages. Where a maker page shows a status, such as "Available" or "Currently Unavailable," we copy it as of Nov. 5, 2026.

Sources

  1. Federal: Federal Custom Shop Custom Rifle Ammo .284 Winchester 140 gr Fusion Soft Point, item FCS284WFS1 (checked Nov. 5, 2026)
  2. Federal: Federal Custom Shop Custom Rifle Ammo .284 Winchester 140 gr Trophy Bonded Tip, item FCS284WTT1 (checked Nov. 5, 2026)
  3. SAAMI: ANSI/SAAMI Z299.4 centerfire rifle standard, .284 Winchester drawing (checked Nov. 5, 2026)

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