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.297/250 Rook
Type	Rifle
Place of origin	United Kingdom
Production history
Designer	Holland & Holland
Designed	Pre-1880s
Specifications
Parent case	.297/230 Morris
Case type	Rimmed, bottleneck
Bullet diameter	.250 in (6.4 mm)
Neck diameter	.267 in (6.8 mm)
Shoulder diameter	.294 in (7.5 mm)
Base diameter	.295 in (7.5 mm)
Rim diameter	.343 in (8.7 mm)
Case length	.83 in (21 mm)
Overall length	1.1 in (28 mm)
Primer type	Kynoch # 69
Ballistic performance
Bullet mass/type Velocity Energy 56 gr (4 g) 1,100 ft/s (340 m/s) 150 ft⋅lbf (200 J)
Source(s): Cartridges of the World,[1] & Modern sporting gunnery.[2]

The.297/250 Rook / 6.4x21mmR is an obsoletecenterfire riflecartridge developed byHolland & Holland.

The .297/250 Rook is a bottleneckedrimmed cartridge originally designed for use inrook rifles for hunting small game and target shooting.^[1]

This cartridge was introduced by Holland & Holland some time before 1880 by blowing out the neck of the.297/230 Morris Long to .250 in (6.4 mm).^[3] This cartridge is a contemporary of the.255 Jeffery Rook and upon their release the pair competed heavily with the very popular.300 Rook.^[4]

As with other rook rifle cartridges, the .297/250 Rook was superseded by the.22 Long Rifle.^[5]

• Rook rifle
• List of rifle cartridges
• List of rimmed cartridges
• 6 mm rifle cartridges

• Barnes, Frank C.,Cartridges of the World, 15th ed, Iola: Gun Digest Books, 2016,ISBN 978-1-4402-4642-5.
• Cartridgecollector, ".300 Rook target",cartridgecollector.net, retrieved 22 April 2017.
• Imperial War Museums, "6.35 x 20.5R : Kynoch; .297/.250 Rook Rifle",iwm.org.uk, retrieved 22 April 2017.
• Imperial War Museums, "7.62 x 29.5R : Kynoch; .300 Rook Rifle & .295 Rook Rifle",iwm.org.uk, retrieved 22 April 2017.
• Sharp, Henry,Modern sporting gunnery: A manual of practical information for shooters of today, London: Simpkin, Marshall, Hamilton, Kent & Co. Ltd, 1906.

• Ammo-One, ".297/250 Rook",ammo-one.comArchived 2021-05-03 at theWayback Machine, retrieved 22 April 2017.
• Cartridgecollector, "297/250 Rook Rifle",cartridgecollector.net, retrieved 22 April 2017.

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