Can someone tell me what a "7 mm Slug" is?
I am guessin' it'd be similar to the proverbial ".44 slug", only with a smaller diameter and weight...... though probably having a much greater sectional density ...... probably also having a cupro-nickel jacket, and very likely a velocity of 3 to 5 times that of the old fashioned ".44 slug"....
One rifle capable of launching these "7mm slugs" is the 7mm STW.... which I have heard stands for "7mm Shoots Through Wyoming"........ though that may be incorrect.