I’m liking this conversation!
I have a modified reamer on order and I already have the barrel. From my research, the SAAMI chamber has a very short free bore. While it was originally chambered by Sako, the thought was all along that it would be used a lot in AR10’s so it is throated so most ammo will fit in a AR10 mag.
SAAMI:
Mine:
The improved design should seat a 210 Partition with the base of the bullet at neck/shoulder junction with a 2.845 - ish OAL with throat geometry design from this century. In order to make this work in a Remington 700 you’ll need a Wyatts mag box. I suspect the same for a 7. This one is going in a custom with a 3.0 box or maybe a Tikka with a LA magazine, I haven’t decided yet. Since it’s not a super popular chamber I have been able to source brass, bullets, and dies from the regular places without getting gouged at Gunbroker. Should have the reamer from Dave Mansons outfit in a couple more weeks!