GS CUSTOM BULLETS - Load Data for FN Bullets

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.

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

Bullet: Bullet numbers consist of the caliber (270) the weight (140gr) the bullet type (FN) and the part number (121).

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 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.

Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
270 Winchester	270140FN121		S365	52	3100
			S355	49	3100
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI



Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI
308 Norma Mag	308145FN006	12	ADI AR 2208	67	3350	33	83	96	100	12085
			R/Shot BigGame	72	3425	34	83	99	100	12714
			H4350	74	3450	32	83	103	100	13506
			Norma URP	74	3450	35	83	103	100	13200
			S365	76	3450	29	83	106	100	12860
			Viht N550	74	3450	35	83	100	100	13343
	308180FN021	10	ADI AR2209	71	3125	32	85	104	99	13131
			H4350	67	3125	30	85	100	100	12611
			Rel 22	75	3175	32	85	108	100	13939
			Norma URP	67	3100	30	85	100	100	12269
			S365	69	3100	29	85	102	100	11958
			Viht N550	67	3100	30	85	97	100	12421
Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI



Calibre	Bullet	Twist	Powder	Start gr	MAX FPS	FPS/Inch	COL/mm	% Fill	Burn	M/PSI

Top of Page

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 moly coated.