J4 jackets

Discussion in 'Long Range Hunting & Shooting' started by oldmossy, Apr 4, 2013.

  1. oldmossy

    oldmossy Well-Known Member

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    Mar 7, 2012
    Are j4 jackets all the same thickness? Or as the jacket gets thicker or thinner it changes to a different name? Example- the berger hybrid has a thicker jacket than say a hunting vld or varmit bullet. Does all three of these have j4 jackets?