08-11-2020, 08:28 PM
(08-11-2020, 05:40 PM)KRYSTOFILUS Wrote: That sucks.
Barrel chambers other ammo with no problems so we can rule out other variables than the Hornady 105 BTHP load?
Well I know that I had checked these when I had the 16" proof barrel and it didn't seem like I was going to be into the lands/rifling - so today I measured 5 factory (105 BTHP) COAL and they ranged from 2.2485-2.2510".
I hand fed these into the chamber and rode the BCG letting it softly come to rest on the base of the cartridge and then used the forward assist to get the bolt closed. 5 out of 5 extracted with little effort.
So this seems to be isolated to full cyclic action of the BCG on the loads and not necessarily a barrel/throat issue with the proof.
I recall in my Grendel reloading experience the Sierra pro hunters would change COAL when sending the BCG home - they are very slick bullets and perhaps the neck tension wasn't strong enough to hold the bullet in place so it would contact the lands/rifling when cycled.
Maybe that is the culprit with these Hornady Black rounds.
I cannot check any other factory loads, these are all that I have at the moment.