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505455HV272 Technical Profile © Application: General Hunting

Barrel Bore Diameter: 0.494" 12.550 mm The diameter of the barrel from land to land.

Barrel Groove Diameter: 0.504" 12.800 mm The diameter of the barrel from groove to groove.

Bullet Weight: 455gr 29.5g Bullets are guaranteed to weigh within 0.25% of the stated weight.

Bullet Length: 1.40" 35.650 mm

Secant Ogive Length: 0.60" 15.316 mm These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")

Meplat Diameter: 0.13" 3.200 mm

Min Bullet Protrusion: 0.71" 17.970 mm Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.

Max Bullet Protrusion: 1.02" 26.000 mm

Bullet conforms to CIP and SAAMI for magazine length. Check the magazine length of your rifle for suitability with this bullet.

Maximum M/V: 2800fps 853 m/s If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.

Short Range Twist: 26.4" / 671 mm or tighter 53.5 Cal/length or tighter Twist recommended if average hunting distances are 150 yards or 140 m. A tighter twist can be used.

Twist: Sg = 1.5: 28.0" / 706 mm 56.3 Cal. in length General hunting twist for average distances to 300 yards or 280 m. A tighter twist can be used.

Minimum Twist: 31.5" / 800.1 mm 63.8 Calibers in length The twist required for stable flight and good terminal performance further than 300 yds or 280 m.

Minimum Impact Speed: 1600fps 488 m/s At this impact speed, the bullet will open to at least double caliber.

Calculated Ballistic Coefficient - G1 profile

BC = 0.315 Maximum to 2200 fps Maximum to 671 m/s BC values are calculated at standard Metro values using a G1 profile. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers. Enter these values into an external ballistics program to calculate BC for your launch speed and distance. For excact values, shoot drop tables at the elevation and temperature for your location.

BC = 0.313 2200 fps to 1600 fps 671 m/s to 488 m/s

BC = 0.302 1600 fps to 0 fps 488 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

505 Gibbs

NOTES

A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting at average 300yds/280m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

*Note that Sg increases as twist tightens. *A 1:10" twist is tighter than a 1:12" twist within a given caliber only. *Twist rates given in caliber lengths can be compared across calibers. *Choose a bullet length best suited to your rifle twist and type of shooting. *When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified, is not advisable. *Some experimentation will be required to determine exact drop tables for your equipment and location.

505455HV272 Technical Profile © Application: General Hunting

Barrel Bore Diameter:	0.494"	12.550 mm	The diameter of the barrel from land to land.
Barrel Groove Diameter:	0.504"	12.800 mm	The diameter of the barrel from groove to groove.
Bullet Weight:	455gr	29.5g	Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length:	1.40"	35.650 mm
Secant Ogive Length:	0.60"	15.316 mm	These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")
Meplat Diameter:	0.13"	3.200 mm
Min Bullet Protrusion:	0.71"	17.970 mm	Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.
Max Bullet Protrusion:	1.02"	26.000 mm
Bullet conforms to CIP and SAAMI for magazine length.			Check the magazine length of your rifle for suitability with this bullet.
Maximum M/V:	2800fps	853 m/s	If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.
Short Range Twist:	26.4" / 671 mm or tighter	53.5 Cal/length or tighter	Twist recommended if average hunting distances are 150 yards or 140 m. A tighter twist can be used.
Twist: Sg = 1.5:	28.0" / 706 mm	56.3 Cal. in length	General hunting twist for average distances to 300 yards or 280 m. A tighter twist can be used.
Minimum Twist:	31.5" / 800.1 mm	63.8 Calibers in length	The twist required for stable flight and good terminal performance further than 300 yds or 280 m.
Minimum Impact Speed:	1600fps	488 m/s	At this impact speed, the bullet will open to at least double caliber.
Calculated Ballistic Coefficient - G1 profile
BC = 0.315	Maximum to 2200 fps	Maximum to 671 m/s	BC values are calculated at standard Metro values using a G1 profile. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers. Enter these values into an external ballistics program to calculate BC for your launch speed and distance. For excact values, shoot drop tables at the elevation and temperature for your location.
BC = 0.313	2200 fps to 1600 fps	671 m/s to 488 m/s
BC = 0.302	1600 fps to 0 fps	488 m/s to 0 m/s
Suitable Cartridges, with consideration of the above specifications:

505 Gibbs


NOTES
A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting at average 300yds/280m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

Note that Sg increases as twist tightens. A 1:10" twist is tighter than a 1:12" twist within a given caliber only. Twist rates given in caliber lengths can be compared across calibers. Choose a bullet length best suited to your rifle twist and type of shooting. When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified, is not advisable. Some experimentation will be required to determine exact drop tables for your equipment and location.