Grendel II chamber

[LR1955]

As long as it is OK with the Mods, it would seem a reasonable idea to begin putting this info into a single location.* Hopefully, this will prevent the need for plowing through long threads that are largely about something else in order to find pertinent information.

As of early 2014, there is a lot of speculation about the performance of "Grendel II" chambers, some of which come with new barrels, others from the modification or "scraping" of existing ones.

[U] Please include information about the barrel, including the manufacturer or similar info (like "Stoner"), type of chamber, whether is was sent out for modification.
[/U]

Hopefully, it will be useful to get enough information to help owners of these barrels choose which factory loads are most likely to provide the best accuracy.** If it is discovered that these Grendel II barrels perform well with the same loads as the 6.5 Grendel SAAMI-spec ones, so much the better.


I hope that one of the Moderators will step in and let us know if this thread should include reloading info. WARNING: DO NOT EXCEED THE PARAMETERS OF LOADS TESTED AND PROVIDED IN RELOADING GUIDES OR BY MANUFACTURERS. Damaging your weapon or yourself can ruin your day and/or result in soiled underwear.



* This thread might be considered part of the 6.5 Grendel Ammunition and Reloading section, but we don't know yet if the Grendel II prefers certain bullets or factory loads.

** Of course not all barrels prefer the same loads, but this would be a place to start.

N:

What is this 'Grendel II' chamber? For all the years I have been involved with this cartridge, I know of two chamber designs. One was the conventional design with some leade and a taper. From my recollection of the Grendel history, this was the first chamber design Alexander used and found it to be lacking in terms of ability to handle different ogive types. So he came up with the compound throat which I believe is what he used in the patent issues that came up. The compound throat was what defined 'Grendel' so guys who didn't want to deal with Alexander to use the name, simply went back to the conventional throat design.

So, you may be calling the original design a 'Grendel II'.

I will say that I have been shooting both chambers for eight or more years and that the compound throat design is more forgiving in terms of accuracy for a variety of bullet ogives, just as Alexander intended. And that the conventional design -- what I think you are calling a 'Grendel II' -- is less forgiving but may give better accuracy with some loads.

Honestly though, it is as unlikely that anyone can come up with anything conclusive as it is that anyone on the Military forum will come up with an ideal military cartridge, or even bullet for that matter.

Also, I thought your question concerned factory loads? You put the handloading disclaimer in your post.

If this morphs into a handloading issue, as I am pretty sure it will, I will move it to the handloading forum is all. Not any big deal.

LR1955