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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Mega
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<blockquote data-quote="PapaSmurff" data-source="post: 2870426" data-attributes="member: 118512"><p>My experience after building 2 338 Mega's using the medium length reamer is that you should always try to use the long action reamer unless you're gonna be shooting 225's or lighter bullet weights. If you're planning on shooting the 250's on up or even the 210, 225 solid coppers like the Barnes TTSX for example I would highly recommend the long throated reamer. Even if your only gonna have a max overall length of 3.100" the extra freebore will help your pressures not spike so fast and sort of spread out the initial pressure curve more or less; just look at Weatherby calibers for a perfect example. Their calibers have extremely long freebore allowing the bullets to jump several hundreds of thousands of inches before contact with the rifle in most cases. Also to note, my Bergara build has a maximum cartridge overall length of 3.100" as well and up to about the Barnes 210 grain TTSX or 200 grain Accubonds are ideal. Anything heavier than the 225-230 Hornady's and the bullets perteude too far down into the case stealing case capacity. The 250 Bergers look strange seated as deep as they have to be to fit inside a 3.100" magazine. I'm thinking about building another 338 Mega on a Defiance XM 3.200" action but if I do then I will definitely be requesting the long throated reamer the next time around no matter what. Some bullet jump of a couple hundred thousands minimizing that initial pressure spike is always a good thing for the 338 Mega I have learned after building 2 of them so far, just my opinion from my experiences with the medium length reamer used on the first 2 rifles.</p></blockquote><p></p>
[QUOTE="PapaSmurff, post: 2870426, member: 118512"] My experience after building 2 338 Mega’s using the medium length reamer is that you should always try to use the long action reamer unless you’re gonna be shooting 225’s or lighter bullet weights. If you’re planning on shooting the 250’s on up or even the 210, 225 solid coppers like the Barnes TTSX for example I would highly recommend the long throated reamer. Even if your only gonna have a max overall length of 3.100” the extra freebore will help your pressures not spike so fast and sort of spread out the initial pressure curve more or less; just look at Weatherby calibers for a perfect example. Their calibers have extremely long freebore allowing the bullets to jump several hundreds of thousands of inches before contact with the rifle in most cases. Also to note, my Bergara build has a maximum cartridge overall length of 3.100” as well and up to about the Barnes 210 grain TTSX or 200 grain Accubonds are ideal. Anything heavier than the 225-230 Hornady’s and the bullets perteude too far down into the case stealing case capacity. The 250 Bergers look strange seated as deep as they have to be to fit inside a 3.100” magazine. I’m thinking about building another 338 Mega on a Defiance XM 3.200” action but if I do then I will definitely be requesting the long throated reamer the next time around no matter what. Some bullet jump of a couple hundred thousands minimizing that initial pressure spike is always a good thing for the 338 Mega I have learned after building 2 of them so far, just my opinion from my experiences with the medium length reamer used on the first 2 rifles. [/QUOTE]
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338 Mega
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