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Steve
Your .300 win mag has a maximum OAL (overall length) cartridge length that the chamber will accept. This does not vary from bullet to bullet. If the Berger is longer than most others then that simply means that more bullet will be seated into the case. If your finished bullet exceeds the maximum OAL that your gun allows you will simply not be able to close the bolt on it. There are many opinions as to whether to seat all the way up against the rifling lands or to give the bullet a bit of a jump. One rifle will not react the same as the next as to seating depth. That where load testing comes in. Just one of the many variables that we as reloaders are always taking into account while trying to find that perfect performing load for our rifle. Good luck !!
Billy
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