How does 6.5 Grendal compare to other rounds (GPC)

[Trooper]

The Grendel is fine in a controlled environment. But when you make a version of it with military spec FMJ projectiles and powder, expect it to lose performance. You also need tracer and AP. Fitting these requirements within the existing 11.3 x 39 mm case is likely to be a tall order.

Ideally, the perfect GPC provides 6.5 x 47 mm Lapua performance in as near a 6.5 mm 39 mm case.

It also has to have a lead-free round, not because the tree-huggers have taken over the Pentagon, but because steel core rounds provide excellent penetration against body armour.

Finally, as efficient as the 6.5 mm Grendel bullet is, it isn't clear how well it performs in soft tissue in terms of yaw and over-penetration.

The 6.5x47 Lapua is then pushing towards the size of the 7.62x51. How does any of the 6.5mm compare to the 7mm UIAC?

I would gather that that 6.5x47 would not fit in the magazine well of the current M4/M16 families.