Grendel II chamber

[JASmith]

This should at least partly help answer your question:

stokesrj, whose opinion I deeply respect, has shot both chambers extensively, and if I recall his old posts correctly, he has found that both chambers shoot well, provided you select the best bullet for that rifle.

If you want ULTIMATE accuracy with any barrel, you have to work the load and bullet correctly.

I believe that the compound throat allows you to shoot more bullets with reasonable accuracy, as LR1955 has pointed out. Bill Alexander and Arne Brennan did a lot of work to find that chamber and for good reason. At one point I shot every single factory load into sub MOA groups with a SAAMI chamber. I suspect that I could repeat that with my SAAMI Grendels now.

I already know that I can't do that with the LBC 264 Black Hole barrel I have, but it does shoot factory Hornady into sub MOA groups and my handloaded Hornady into .75 MOA groups as well. I doesn't like my handloaded 107 Sierras, or 100 grain Bergers. It also won't shoot 123 Lapua Scenars, but that fits what Arne stated above.

Note that the lighter, shorter bullets don't do as well in the LBC and we can infer the same will be true of the "Grendel II" because both have the parallel freebore. That is part of the reason the compound throat exists -- to shoot ALL bullets reasonably well. That 0.5 degree taper in what would normally be a parallel freebore makes a big difference in accuracy when shorter bullets are loaded while still doing very well with the heavier bullets.

These differences mean very little if one is looking for minute of deer.

In the end, know what you are buying or have already bought and develop your expectations accordingly.