was that 3/8" at 100 (i.e. 3/8MOA)
Yes, it shot into 3/8 inch, center to center out of two very consistently accurate rifles. Not just one lucky group but once it was sighted in, as both rifles had new scopes on them, for several groups in a row.
The T3 has a medium weight, 1-8 twist barrel and the CZ has a heavy weight 1-9 twist barrel.
The groups were both 3 and 5 shot and were fired at 100 yards from a covered bench off heavy rests/bags.
To say we were pleasantly surprised, would be an understatement.
These groups were shot by two of us, on both rifles so I don't think it's an anomoly.
Those are very nice shooting cartridges in our rifles.
As I mentioned, the T3 fireing pin spring is a bit weak and there are some misfires. My CZ527 didn't have any issues with it. Nice clean burning powder as well. Clean up after 50 rounds was a snap with almost no jacket fouling left in the bore after the initial carbon clean up.
One blast of Wipe Out, with a 15 minute soak time, cleaned the bores back to bare metal.