Re: 6.5 Grendel
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GlockandRoll</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Nukes</div><div class="ubbcode-body">Can anyone explain the "compound chamber" of the 6.5 Grendel?
Has anyone compared it to the similar variants, .264 LBC, 6.5 CSS, etc.?
Does any one of these have a significant edge?</div></div>
http://www.rifleshootermag.com/2011/11/02/6-5-grendel-evolution/
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Thank you.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">...The next task was getting the new cartridge to shoot. The first throat designs were found wanting, so Alexander took a page from the Swedish Mauser book.
“The 6.5x55mm Swede is peculiar among all the other 6.5mms in that it has a half-degree throat,” he says. “This commences right at the end of the chamber neck. The proof is the Swede will shoot just about anything you stuff in it while maintaining a military chamber.
“However the 6.5x55mm is a large case designed for single-base extruded powder. The smaller Grendel has a propensity for double-base ball type propellants. The difference is the double-base propellants are more pressure sensitive.
“Due to this the half degree throat pirated from the Mauser was not building pressure. This worried me regarding secondary detonation in extreme cold conditions, such as Alaska. So we solved this problem by designing the chamber with the back of the throat like a Swedish Mauser and the front like a stock SAMMI design. It was then dubbed a ‘compound angle’ throat because it has two angles, three if you count the transition from the neck to the throat.”
The new chamber design proved not only very accurate but also very forgiving. This latter point is important due to the diverse weight, length and shape of available .264 inch projectiles. All production Alexander Arms 6.5mm Grendel rifles have utilized this compound angle chamber design. Delivery began in late 2004....
Read more:
http://www.rifleshootermag.com/2011/11/02/6-5-grendel-evolution/#ixzz25ekc3ZZ4</div></div>
I tried to find a schematic online for a more precise understanding, but failed.