This posting that you have provided is a great help to me and I want to thank you. I was really truly starting to research the Grendel and then have one built and you have saved me from a huge mistake.
Who knows? If the new light weight DPMS catches on over the course of the next year DPMS might offer a model chambered for the 260.
Having several throat options is normal for popular calibers. Think 5.56, 223 REM and 223 Wylde. The 308 has 5 throat variants I've found that all shoot 308 Win and are labeled 308 Win. Most shooters don't know the difference. They buy a box of ammo and shoot it. They don't know what throat the rifle has. Its really not that confusing really. The Grendel II shoots factory Grendel Ammo but has a .120in throat and has the same size neck .300. With factory ammo it fixes the occasional but problematic issue of factory ammo getting stuck and allows the hand loader to get better velocities. If you get a Grendel II or 264 LBC barrel you'll be fine. You can get a Grendel II from
Underground Tactical Midwayusa Brownells (they recently chaged to the Grendel II) Maxim Firearms Satern barrels You can get a 264 LBC from
Black Hole Weaponary or
Les Baers.
Precision Arms has kept the compound throat but lengthened it to avoid the stuck bullet issue so far as i know they are "stuck bullet syndrome" free.
Lilja has a reamer for the Grendel that has a .120in throat and a .296 neck but you have to ask for it otherwise you'll get a much shorter compound throat. They initially went with there own custom throat but they got some pressure from the 65Grendel.com cult and backed down and started using the shorter compound throat. I would recommend using there original custom throat that is very very close to the 264 LBC and Grendel II.
The Grendel case has enough azz for a 243 projectile, and no more. Its a bridge too far, IMO.
My handload with the 120gr Gr Nosler BT i developed last weekend is 110fps shy of 260 Remington velocities for the same barrel length and bullet. Most AR-10 260 Remington's are a 18 or 20in which means that a Grendel II in a 22 or 24in barrel can get the same performance. Thats pretty good and much cheaper than building a full AR-10. A factory 120gr Nosler BT out of a 24in barrel is going at 2890fps. Sure there are faster loads with the same bullet and with hand loads you get get much better just trying to make the point that a Grendel II can get closer than you may think to those 260 Remington velocities. My reload i worked up last Saturday out of a 24in barrel for 120gr Nosler BT is going 2780fps. You can't get 2780fps from a SAAMI Grendel without compressing the powder and spiking pressures but with the Grendel II you can load longer and get naturally higher velocities.
