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Bookmark or Share- Rechambering a 6.5x55 - 24HOURCAMPFIRELoaded at equal pressures, I don't think that you can reasonably expect to gain 200 to 300 fps with an additional 9 grains of case capacity, 57 for the 6.5x55 vs. 66 for the 6.5-284. If you set the barrel back a little and reamed the chamber to 6.5-06AI, you'd get around 73+/- grains of case capacity.
- Granpa's 30 belted Newton custom, now mine - 24HOURCAMPFIRERim dia.-.530. Length of .308 Norma-2.56. It appears that the .30 Newton was a rimless case slightly larger in diameter than the base dia. of the H & H type cases, but smaller than the belt. They might have slightly more capacity than an identical length H & H case due to the .523 diameter for the Newton.
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