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<blockquote data-quote="Fiftydriver" data-source="post: 35439" data-attributes="member: 10">TomVan,The term &quot;overbore&quot; was started back inthe day when the best and basically only slower powders on the market were 4350 and 4831.THe term overbore was started when a case, which was larger then the standard at the time was used but could not provide any real velocity advantage over existing rounds using the available 4350 and 4831.The common thinking was that they were not real useful as they provided very little advantage over smaller cased rounds.The 25-06 was thought to be very overbore for its bore size.Today, with the large array of slow burning powders, this term means very little to the extreme performance experimentor.The way to get the best long range performance out of the 300 RUM is to use bullets at least 180 gr and heavier is better with powders starting with H-1000 and slower.Good Shooting!!!Kirby Allen(50)</blockquote>

[QUOTE="Fiftydriver, post: 35439, member: 10"] TomVan, The term "overbore" was started back inthe day when the best and basically only slower powders on the market were 4350 and 4831. THe term overbore was started when a case, which was larger then the standard at the time was used but could not provide any real velocity advantage over existing rounds using the available 4350 and 4831. The common thinking was that they were not real useful as they provided very little advantage over smaller cased rounds. The 25-06 was thought to be very overbore for its bore size. Today, with the large array of slow burning powders, this term means very little to the extreme performance experimentor. The way to get the best long range performance out of the 300 RUM is to use bullets at least 180 gr and heavier is better with powders starting with H-1000 and slower. Good Shooting!!! Kirby Allen(50) [/QUOTE]

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