LOAD DATA FOR  SP  BULLETS

Large calibres from .338" / 8.58mm
 

Do not use the load data below for any other type of bullet.
This data only applies to GS Custom SP 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. If a powder is not listed, the powder on the list gives better performance or the unlisted powder is new and has not been tested.

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. It is not a minimum load and it is not supposed to give the speed as shown in the MAX FPS column.

MAX FPS: This is the speed at which maximum allowed pressure is likely to occur in a 24" barrel. It is not the recommended speed. 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. If the load is configured for a different barrel length, the barrel length is specified.  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 Large calibres from .338" / 8.58mm
Go to Small Calibres / Medium 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
338 Win Mag 338232SP150 10 ADI AR 2208 54 2725 21 101 100 8480
24" Barrel      RamShot BigGame  59 2775 22 105 100 8982
      Rel - 15  55 2750 22 99 100 8825
      Norma 203B  55 2750 22 100 100 8762
      S 365  60 2825 22 CC 100 9090
      Viht N550  61 2800 23 106 100 9482
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
338 Lapua Mag 338232SP150 10 ADI AR 2213 87 3100 30 108 99 13506
24" Barrel      RamShot Hunter 83 3050 28 98 100 12388
      Rel 22 88 3100 32 CC 100 13537
      Norma 204 82 3050 29 100 100 12540
      S365 81 3000 27 103 100 11536
      Viht N560 89 3150 31 CC 100 14139
  338267SP250 9 ADI AR 2213 78 2800 25 106 100 11753
      Accurate MAGPRO 83 2825 26 107 99 12468
      Norma MRP 80 2825 25 105 100 11799
      RamShot Magnum 84 2850 25 CC 100 11958
      Somchem S385 76 2750 23 104 100 10602
      Viht N560 79 2850 26 106 100 12303
  338309SP142 8 ADI AR 2213 73.5 2650 23 104 100 11490
      Rel - 22 74 2650 22 105 100 10864
      IMR 7828 SSC 74 2650 22 103 100 11539
      Norma MRP 75 2650 23 103 100 11532
      Somchem S385 72 2550 21 102 100 10344
      Viht N560 74.5 2675 23 105 100 12033
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
338-378 Weatherby Mag 338267SP250 9 ADI AR 2209 88 2925 26 93 100 11641
26" Barrel      Accurate Magpro 97.5 3000 23 97 100 13823
P/Max = 63817psi     Ramshot Magnum 100.5 3000 26 99 100 12645
      Viht N560 93.5 3025 27 96 100 13545
      Norma MRP 2 99.5 3000 28 105 100 12886
      Somchem S361 93.5 2875 25 93 100 11195
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
375 H&H 375200SP224 20 0 0 0 0 0 0 0
24" Barrel     0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      S335 73 3150 26 105 100 8257
      0 0 0 0 0 0 0
  375291SP174 12 0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      S355 61 2600 20 CC 100 7590
      0 0 0 0 0 0 0
  375355SP173 10 0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      S341 55 2275 16 98 100 6392
      0 0 0 0 0 0 0
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
375 Ruger 375200SP224 20              
P/Max = 63817psi                  
                   
                   
                   
                   
  375291SP174 12 ADI AR 2208 61 2600 20 105 100 7495
      BL-C2 75 2650 20 98 100 7275
      Rel - 15 63 2650 20 103 100 7798
      Norma 203B 63 2650 20 104 100 7740
      S355 64 2600 19 CC 100 7189
      Viht N550 68 2650 20 CC 100 8359
  375330SP032 11 ADI AR 2208 59 2450 18 102 100 6812
      Ramshot BigGame 63 2500 18 106 100 7573
      Rel - 15 60 2450 18 100 100 7439
      IMR 4320 60 2450 18 102 100 7141
      S355 61 2450 17 105 100 7230
      Norma 203B 60 2450 18 101 100 7386
       Viht N550 65 2500 19 CC 100 8008
   375355SP173 10              
                   
                   
                   
                   
                   
  375414SP256 9              
                   
                   
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
408 CheyTac 408408SP336  12 ADI AR 2225 139 3000 23 CC 100 11281
P/Max = 63817psi       Accurate MAGPRO 130 2950 24 95 100 12313
29" Barrel      Alliant Rel-33 147.5 3025 26 106 100 13599
      Hodgdon Retumbo 139 3000 26 CC 100 11281
      Norma MRP2 132.5 2950 23 103 100 11479
      Somchem S385 121 2850 21 93 100 9934
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
416 Barrett 416420SP155 13 ADI AR 2218 178.5 3200 25 101 100 13118
P/Max = 58015PSI      Hodgdon 870 176.5 3100 24 103 100 12277
30" Barrel     Rel-50 185.5 3150 26 103 100 13629
      Norma MRP 2 159.5 3075 23 96 100 11248
      Viht 20N29 192.5 3100 24 CC 99 12939
      Viht N570 169.5 3150 25 97 100 12864
  416477SP156 12 ADI AR 2218 171.5 3025 23 98 100 13200
      Hodgdon H870 168.5 2925 22 100 100 12344
      Accurate 8700 178.5 2900 21 105 100 11925
      Alliant Rel 50 177.5 2975 23 101 100 13195
      Viht N570 162 2975 23 94 100 12902
      Viht 20N29 184.5 2925 23 105 100 12167
  416570SP284

10

 ADI AR 2218 152.5 2700 18 98 100 11113
      Accurate 8700 157.5 2625 18 104 100 10453
      Alliant Rel 50 156.5 2675 19 100 100 11568
      Hodgdon US 869 157.5 2625 19 102 100 11232
      Viht N570 142.5 2675 18 93 100 11253
      Viht 20N29 163 2625 18 104 100 11119
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
                   
                   
                   
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

 % Fill Burn M/PSI
460 Steyr 458566SP195 15 VV N20N29 232 2900 31      
24" Barrel     H 50BMG 215 2900 31      
      H US 869 218 2900 30      
      Accurate 8700 225 2900 29      
      ADI AR 2218 214 3000 31      
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
50 BMG 510720SP140 17 ADI AR 2218 235 2800 25 99 100 13411
P/Max = 53664PSI      H870 232 2750 23 100 100 12499
30" Barrel      Viht N570 225 2750 24 94 100 12530
                   
                   
                   
  510800SP270  16 ADI AR 2218 227 2700 22 98 100 13170
      Accurate 8700 238 2600 21 106 100 11915
      Rel-50 237 2650 23 100 100 13201
      Hodgdon H870 224 2600 31 100 100 12279
      Viht 24N41 224 2600   97 98 12297
                   
  5101100SP097 11 ADI AR 2218 182 2225 16 94 100 10068
                   
                   
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch

 

 % Fill Burn M/PSI
                   
                   
                   
                   
                   
                   
 

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.