The .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.
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| - The .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.
- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .257 Roberts |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:257 Roberts.JPG |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history | Specifications |- ! style="padding-right: 1em;" | Parent case | colspan="2" | 7x57 Mauser |- mm ) )
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| dbkwik:publicsafet...iPageUsesTemplate
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| BW
| - 75(xsd:integer)
- 90(xsd:integer)
- 100(xsd:integer)
- 115(xsd:integer)
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| primer
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| En
| - 1970(xsd:integer)
- 2115(xsd:integer)
- 2145(xsd:integer)
- 2267(xsd:integer)
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| vel
| - 2777(xsd:integer)
- 3108(xsd:integer)
- 3368(xsd:integer)
- 3563(xsd:integer)
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| abstract
| - |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | .257 Roberts |- | colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;" | Image:257 Roberts.JPG |- ! style="padding-right: 1em;" | Type | colspan="2" | Rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | USA |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Production history |- ! style="padding-right: 1em;" | Designer | colspan="2" | Ned Roberts |- ! style="padding-right: 1em;" | Designed | colspan="2" | 1920s |- ! style="padding-right: 1em;" | Manufacturer | colspan="2" | Remington Arms |- ! style="padding-right: 1em;" | Produced | colspan="2" | 1934-Present |- |- ! style="padding-right: 1em;" | Variants | colspan="2" | .257 Roberts (+P), .257 Roberts Ackley Improved |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- ! style="padding-right: 1em;" | Parent case | colspan="2" | 7x57 Mauser |- |- ! style="padding-right: 1em;" | Bullet diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Neck diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Shoulder diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Base diameter | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Rim diameter | colspan="2" | in (mm ) |- |- ! style="padding-right: 1em;" | Case length | colspan="2" | in (mm ) |- ! style="padding-right: 1em;" | Overall length | colspan="2" | in (mm ) |- |- ! style="padding-right: 1em;" | Rifling twist | colspan="2" | 1-10" |- ! style="padding-right: 1em;" | Primer type | colspan="2" | large rifle |- |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Ballistic performance |- style="text-align: center; font-size: 90%; background: #DEDEDE;" cellspacing="0" cellpadding="0" ! Bullet weight/type ! Velocity ! Energy |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) HP||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) HPBT||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) SPBT||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" | style="vertical-align:middle; border-bottom: 1px dotted #aaa; " | gr (g) NOS PART||style="border-bottom: 1px dotted #aaa; "| ft/s (m/s) ||style="border-bottom: 1px dotted #aaa; "| ft·lbf (J) |- style="text-align: center; font-size: 90%;" |- | colspan="3" style="text-align: center; padding-top: 5px; font-size: 90%;" | Source: Hodgdon |} The .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.
- The .257 Roberts a medium powered .25 caliber cartridge known affectionately as the Bob. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the strong energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.
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