So I called CCI and their tech guy seemed very sharp. By the lot numbers he says they're about 4-5 years old, the Remingtons about 6 years. There in lies the problem. He says b/c the case is basically a .22mag necked down, with age the neck tends to get brittle, therefore subject to rupture upon firing.
He also stated the only danger in using this ammo is if there are prefire fractures.

Obviously I don't get to the range enough. ???????

Apparently you were posting while I was typing.
It's a G2 and I'm shooting Hornady's lever stuff.
As a side note, something I wrote about awhile back concerning the .45-70. I had purchased a box of Double Taps 405gr flat nose cast ammo and found it wouldn't go in the chamber b/c of the wide meplat and as I found out also b/c of basically no throat in that barrel. I plan to eventually have the throat cut to accept these rounds or would you advise against shooting that heavy a load in this gun ?

Jeff