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.

Calibre: If your caliber is not listed, please email us for assistance.

Bullet: Bullet numbers consist of the caliber (338) the weight (232gr) the bullet type (FN) and the part number (150).

Twist: The twist is indicated as one rotation in the number of inches shown. Bear in mind that if a bullet is indicated for a particular twist, 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.

FPS/Inch: This is the speed change that is probable for barrels longer or shorter than 24" with the indicated powder.

COL/mm: Is the cartridge overall length in millimetres on which the load data is based.  Divide by 25.4 for Inches. This is not a recommendation - merely the number we used to generate the data.  Your rifle will determine, according to the load guidelines, what its COL will be.

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. 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 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.

Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
338 Win Mag	338232SP150	10	ADI AR 2208	54	2725	21	85	101	100	8480
			RamShot BigGame	59	2775	22	85	105	100	8985
			Rel - 15	55	2750	22	85	99	100	8825
			Norma 203B	55	2750	22	85	100	100	8762
			S 365	60	2825	22	85	CC	100	9090
			Viht N550	61	2800	23	85	106	100	9482
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
338 Lapua Mag	338232SP150	10	ADI AR 2213	87	3100	30	94	108	99	13506
			RamShot Hunter	83	3050	28	94	98	100	12388
			Rel 22	88	3100	32	94	CC	100	13537
			Norma 204	82	3050	29	94	100	100	1254
			S365	81	3000	27	94	103	100	11536
			Viht N560	89	3150	31	94	CC	100	14139
	338267SP250	9	ADI AR 2213	78	2800	25	94	106	100	11753
			Accurate MAGPRO	83	2825	26	94	107	99	12468
			Norma MRP	80	2825	25	94	105	100	11799
			RamShot Magnum	84	2850	25	94	CC	100	11958
			Somchem S385	76	2750	23	94	104	100	10602
			Viht N560	79	2850	26	94	106	100	12303
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
408 Chey Tac	408385SP144	13	Accurate Magpro	138	3050	23
			Norma MRP2	140	3050	25
			RamShot Magnum	143	3050	26
			Viht N570	150	3100	28
			ADI AR 2214	140	3000	24
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
460 Steyr	458566SP195	15	VV N20N29	232	2900	31
			H 50BMG	215	2900	31
			H US 869	218	2900	30
			Accurate 8700	225	2900	29
			ADI AR 2218	214	3000	31
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI