Rifles in the UK
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FIREARMS AND SAFETY
Hearing protection
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Case trimming
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Case trimming

Every time a rifle cartridge is fired, the case neck stretches very slightly. Eventually this can lead to chambering problems (and consistency problems if the cases stretch at different rates). After every few firings, it is a good idea to measure the length of your fired cases and trim them to the 'trim to length' shown here if they need it. The picture shows an RCBS case trimmer, available for about 80 at any good gun shop.
RCBS case trimmer
Trim to length data

The following data is taken directly from the The Vihtavuori Reloading Guide for Centerfire Cartridges: Edition 6, 2008.
Metric Cartridges Trim to length Imperial Cartridges Trim to length
6mm PPC 1.508" .22 Hornet 1.394"
6mm BR Norma 1.551" .222 Remington 1.693"
6.5 Grendel 1.516" .223 Remington 1.752"
6.5x47 Lapua 1.843" .22 PPC 1.508"
6.5x55 Swedish Mauser 2.157" .22-250 Remington 1.902"
6.5-284 Norma 2.161" .243 Winchester 2.039"
7mm-08 Remington 2.028" .240 Weatherby Magnum 2.488"
7mm-08 Remington 2.028" .25-06 Remington 2.484"
7x57 2.236" .260 Remington 2.028"
7x57R 2.236" .270 WSM 2.091"
7x64 2.512" .270 Winchester 2.531"
7mm Remington Magnum 2.492" .270 Weatherby Magnum 2.539"
7mm Weatherby Magnum 2.539" .30 Carbine 1.283"
7.62x53R 2.098" .30-30 Winchester 2.031"
7.5x55 Swiss 2.181" .300 Savage 1.862"
7.62x39 1.516" .308 Winchester 2.008"
8x57 JS 2.236" .30-06 Springfield 2.484"
8x57 JRS 2.236" .300 H&H Magnum 2.842"
9.3x62 2.433" .300 WSM 2.021"
9.3x66 Sako 2.591" .300 Winchester Magnum 2.610"
9.3x74R 2.933" .300 Weatherby Magnum 2.815"
.300 Lapua Magnum 2.713"
.300 RUM 2.839"
.303 British 2.213"
.338 Winchester Magnum 2.492"
.338 Lapua Magnum 2.714"
.375 H&H Magnum 2.842"
.444 Marlin 2.216"
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