Every artillery piece that could be effective against Longstreet's assault / Pickett's charge was used . The actual number of casualties inflicted on Johnny is not known. Kinda hard to figure out if historians only have a rough number of troops involved. The numbers I have always seen is anywhere between 12,000 - 15,000 . From what I understand is that the rebs did not do as good a job with numbers of casualties , etc as the north did. The federal 2nd corps that defended that part of the line was not going to run from that assault plus they had reinforcements coming from other parts of the federal line .My brother Larry is a huge Civil War historian and memorabilia collector.
He says the exact same thing.
His last visit to Gettysburg, he insisted the Ranger take him down to the original starting point of Pickets Charge from the Confederacy side.
Pickets men walked up that hill side by side into 6,500 muskets and 240 cannons
Zap have you ever been there ?