I used to shoot a lot of the "old" Blazers. These came bulk-packed (just dumped in) 50/box. They were fairly accurate for plinking ammo ($8/brick around here), but used to have a heavy wax lube on them. I never had much problem with the lube, but some others had feeding problems with it.
The "new" Blazers come with a plastic insert in the box. They have little or no lube visible, especially when compared to the old style. I have not shot any of this style yet. I have heard on the rumor mill that they are the same as the "new" Federal Lightnings, but I have no way of knowing if that's correct.
The old Federal Lightnings that I shot (15 yrs. ago) were filthy on my 617, but that's a whole different story...
At any rate, I think that there would be better choices for hunting at 100yds. You could almost certainly find a more accurate load, wich would do better for crows.
For something as large as groundhogs, you'd probably want something a little faster, or maybe a better bullet design (HP, SGB, etc.) I don't have many groundhogs around here, but I would speculate that 100 yds. might be a little far for clean kills with a .22LR. If I'm wrong, I'm sure someone else will chime in...
Good luck!