In general, they don't penetrate quite as deeply as Partitions of the same weight, despite retaining more weight in 7mm and .30 caliber. (Partitions in calibers from 9.3mm on up retain about as much weight at A-Frames, due to the partition being farther forward.) This is because A-Frames expand wider, which has more effect on penetration than retained weight.
The other thing that many hunters don't realize about A-Frames is that only the front core is bonded. The rear core isn't--which is why the rear of the bullet often bulges at shorter ranges, or when hitting heavier bone at longer ranges. This also tends to reduce penetration vs. a Partition of the same weight and diameter.
But this definitely does NOT mean A-Frames don't work. Have seen them in action on game from deer to Cape buffalo, in calibers from .25 to .416, and they kill very well.
