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Anonymous said:Generally speaking, it is hard for a small round to compare to a large one, as the sectional density tends to be relatively low. The .50 BMG had a high sectional density (0.383) because the round is quite long for its caliber. The .50 had the best ballistic shape of any round in WWII, but this is overcome by the huge SD advantage of some of the larger rounds (but none in the 20mm class).
delcyros said:How about MG 131, MK 103 and MG 213B/20mm? They should come close if not better...
delcyros said:Well said. I understand now the shortcomings of MG 131 and MG 151/20.
But what about the UKB and 151/15 in direct comparison to the 0.50 cal. BMG? The UKB had the same calibre, a comparable shaped projectile, when firing AP or API rounds but more weight (and therefore a higher sectional density). The 151/15 firing AP rounds isn´t that bad either but has more muzzle velocity. When firing the lighter APR round it has substantially more muzzle velocity but I expect the shell to loose it´s velocity advantage quite soon due to a lower sectional density. Corretc?