I thought the SA was pretty good?
Depends on how you define good. I've shot about 1000 rounds of it because that's all I can get now.
It goes bang everytime in my 7.62X51 chambered Garand (take a deep breath purists - I had it done because mil-surp .308 is cheaper and easier to find than 30-06 where I live).
In my personal experience about 1 in 10 cartridges will be too long. About 1 in 50 the case diameter is too wide.
Both conditions result in feeding problems. Too long is the one I worry about because it can create excess pressure. Too wide - so far it seems like they just require an extra tap on the bolt handle to get them to feed. They extract just fine.
The stuff shoots in to a 4" or so circle at 100 yards on a good day from a sandbag. Might be better than that, probably is with a steadier hand, but that's all I can get out of it.