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LOAD DATA FOR  FN  BULLETS

Medium Calibres from .270"/6.8mm   to   .333"/8.46mm

Do not use the load data below for any other type of bullet.
This data only applies to GS Custom FN bullets.

See the Technical Data page for assistance with the correct choice of bullet and for BC values.

Read the following notes before going to the load data table below.

Cartridge: If your cartridge is not listed, please email us for assistance.

Bullet: Bullet numbers consist of the caliber (first three digits) the weight in gr (next three digits) the bullet type (two letters) and the part number (three digits ). Bullets in green are the preferred bullets for general use in standard calibers.

Twist: The twist is indicated as one rotation in the number of inches shown. 
This is a minimum number. When a bullet is indicated for a twist rate, it can also be used in faster twist rates (smaller numbers), but not in slower twist rates (bigger numbers).  See the Technical Data page for more information about the correct bullet choice.

Powder: Listed powders are chosen to give a combination of the best case fill, most complete burn in a 24"barrel and lowest muzzle pressure.

Start gr: The indicated start load in grains is a safe load in our experience. It may give maximum speed in some rifles and can be reduced if needed.

MAX FPS: This is the speed at which maximum allowed pressure is likely to occur in a 24" barrel. Adjust the number by the amount given in the FPS/Inch column for barrels longer or shorter than 24". Do not exceed the adjusted MAX FPS number. Whatever charge is required to reach the MAX FPS (P/Max ) is the maximum charge for that rifle. We recommend 50fps to 100fps under maximum as a good general load.

FPS/Inch: This is the speed change that is probable for barrels longer or shorter than 24" with the indicated powder.
Add or subtract the value in this column for every inch the barrel is longer or shorter than 24".  All load data is configured for 24" barrels except where it is stated otherwise.

Case Fill: Is approximately how much the charge will fill the case. Compressed charges up to 105% are not unusual. Full cases give better accuracy and more consistent speeds.  Compression is not bad, providing it does not cause mechanical problems such as COL changes or case bulging that prevents chambering. This is a guide line only and the numbers may vary depending on the make of the case and the capacity. If this column contains CC, case capacity will probably be the limiting factor rather than MAX FPS.

Burn: Is the percentage of powder that will burn in a 24" barrel. Accuracy is improved with a more complete burn.

M/PSI: Is the approximate muzzle pressure at MAX FPS. This is an indication of what the recoil will be. With the same bullet and rifle, lower muzzle pressure will have less recoil.

Load Data for Medium Calibres from .270"/6.8mm   to   .333"/8.46mm
Go to Small Calibres / Large Calibres

Have you read the notes above?  If not, do so before using this load data table.

 
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
308 Norma Mag 308145FN006 12 ADI AR 2208 67 3350 33 96 100 12085
P/Max = 63817psi     R/Shot BigGame 72 3425 34 99 100 12714
      H4350 74 3450 32 103 100 13506
      Norma URP 74 3450 35 103 100 13200
      S365 76 3450 29 106 100 12860
      Viht N550 74 3450 35 100 100 13343
  308180FN021 10 ADI AR2209 71 3125 32 104 99 13131
      H4350 67 3125 30 100 100 12611
      Rel 22 75 3175 32 108 100 13939
      Norma URP 67 3100 30 100 100 12269
      S365 69 3100 29 102 100 11958
      Viht N550 67 3100 30 97 100 12421
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
8X68S 323180FN119  11 S365 71 3100 28 106 100 12343
P/Max = 63817psi                  
                   
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
338 Win Mag 338240FN085 10 ADI AR 2208 60 2700 23 96 100 9117
P/Max = 62366psi     H4350 66 2800 24 103 100 10260
      Ramshot Hunter 70 2800 25 100 100 10444
      Norma URP 66 2775 24 103 100 9981
      S365 68 2800 23 106 100 9717
      Viht N550 67 2875 25 100 100 10125
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
338 Rem Ultra Mag 338240FN085 10              
P/Max = 63817psi                  
                   
      S385 85 2825 28 98 100 11663
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
 

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GS Custom Bullets, situated in Port Elizabeth on the East Coast of South Africa, manufactures solid copper, turned, monolithic hollow point bullets for hunting and sport shooting. These bullets are used by hunters on several continents, hunting from the smallest of antelope to the largest of dangerous game, using the smooth HP bullet, as well as the more popular HV, FN and SP bullets with the patented drive band concept. GSC bullets are configured for the highest possible ballistic coefficients. SP bullets are mainly used for sport shooting. All GS Custom Bullets are coated.