25-20 WCF – Less Than 30,000 PSI

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Warning: Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet length will alter net case capacity,  pressure and velocity. Primer selection is specific and primer types are not interchangeable. These are maximum loads in my firearms and may be excessive in others. All loads should be reduced by 5% as a starting point for development where cartridges have greater than 40 grains in capacity and 10% for cartridges with less than 40 grain capacity following safe handloading practices as represented in established mainstream reloading manuals. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.

Note: The SAAMI MAP pressure for the 25-20 WCF is 28,000 CUP. There is no consistent correlation between CUP and PSI no matter which high school physics teacher averages the averages to claim there is. So there is no transducer derived PSI rating for the cartridge. Both Winchester (2012) and Remington (2013) applied for CIP for standardization. The CIP Pmax specification is 2700 BAR which is a 39000 PSI equivalent… in round numbers. The loads on this page fall below 30,000 PSI. Keep in mind these are 25″ barrel velocity levels.

25-20  Winchester – Standard Pressure
Firearm Savage 23B
Barrel Length 25″
Max Case Length 1.330″ +0.000″/-0.025″
Min – Max COL 1.530″ – 1.592″
Primer CCI BR-4
Bullet Diameter 0.258″ +0.000″/-0.0030″
Reloading Dies RCBS

Bullet Type Bullet
Weight

Grains
Net H2O
Grains
Capacity
COL” Powder Type Powder
Charge

Grains
Muzzle
Velocity

fps
Muzzle
Energy

ft/lbs
Hornady FP
60 15.8 1.590 Alliant 2400 10.2 2369 748
Hornady FP 60
15.8
1.590
H4227 12.5 2295 702
Hornady FP
60 15.8 1.590 H4198 14.0 2282 694
Speer SP 75 14.0 1.545 AA1680 12.5 2057 705
Speer SP 75 14.0 1.545 H4198 12.0 1977 651
 Hard Cast FP
83 13.8 1.590 H4227 10.5 1929 686
 Hard Cast FP 83 13.8 1.590 H4198 11.5 1877 649
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