G7LProjectile Design Characteristics

1. Bases

1.1 Boat-tail

1.1.1 Slightly rebated/stepped as a result of hand swaging type tooling in appearance;

1.1.2 More accurate than a standard conical boat-tail? Find out for yourself;

1.1.3 Creates the appropriate amount of drag to keep the centre of pressure behind the centre of gravity;
1.1.4 Maximises accuracy and velocity efficiency at >500y;
1.1.5 Angles used depend on the boat tail length but for long range (500y+) range from 10 to 7 degrees;
1.1.6 Critical to stability/accuracy during transonic and subsonic velocity levels;
1.1.6.1 Boat-tail and Mach speed combined, can contribute over 50% of total projectile drag!
1.2 Flat Base

1.2.1 Maximises accuracy at ranges less than 500y.

2. Shank/Bearing Surface

2.1 Sufficient length to ensure projectile alignment in barrel;

2.2 Tapers slightly from a maximum diameter at the Base to where it meets the Ogive;
2.3 Surprisingly the shank contributes little to the overall drag through the atmosphere of a projectile.

3. Ogive

3.1 Moderately aggressive 12S calibre minimum radius ogives with a tangent finish;

3.2 Provides good velocity efficiency with good tolerance for seating depth;

3.3 Provides a significant portion of the overall projectile drag.

4. Meplat

4.1 Designed to provide a consistent diameter finish with a moderately small open tip diameter, this should minimise the requirement for tipping/pointing the meplat.

4.2 Does provide a portion of the overall projectile drag. Most designs have an optimum meplat diameter of 15% of their projectile calibre at supersonic flight.

4.2.1 A meplat diameter of 20% provides the same drag as a meplat diameter of 10%, Figure 1 (Sommer 1952, 13) __ia700704.us.arch...ectofbluntnes00ames;

4.2.2 An absolute pointed cone provides the most efficient meplat but has yet to be achieved with an open tip match (OTM) projectile design!

5. Jackets

5.1 Precision gilding metal target jackets 95% copper, 5% zinc.

6. Cores

6.1 99.9+% extruded lead.

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