td, I think the graphic will explain, the SC 250 bomb had mounting lugs on the nose for vertical carriage, also on the casing for horizontal. Germans wanted all their aircraft to be dive bomber capable, guess horizontal mounting would be used in that event with reduced capacity in the bomb bay, but extended by under wing carriage.
As for accuracy even the famed Norden bomb sight had issues, so I think going out tail first would have little detrimental effect.
The actual performance of the Norden in combat was good some of the time, but rarely great, and often terrible. Several studies revealed that as few as 5 percent of Eighth Air Force bombs fell within 1,000 feet of the target and the average error for 500-pound bombs dropped in Europe was a whopping 1,673 feet. There are examples of many hundreds of bombs aimed at a single small target with only one or two bombs reaching their mark. Some gross errors were even measured in miles.
https://warfarehistorynetwork.com/20...beyond-belief/