327 federal mag and wadcutters

[tightgroup tiger]

I realize that wadcutter bullets are usually shot at subsonic or lower speeds due to leading your barrel at higher speeds, so with copper plated DEWC Berry's plated bullets, would I still have to keep wadcutters at subsonic speeds?

For close range use, say out to 25yds, would shooting plated wadcutters at say 1200fps hurt anything?

Does the accuracy of wadcutters diminish with speed?

I looked them up on Wikipedia but didn't learn anything I didn't already know about them, which isn't much.