ID caliber and make of sabots?

[1more4me]

Hunted a site today that had a skermish between CSA Mounted Texas Cavalry being pushed off by two Union Brigades, many mounted, so it has a few pistol slugs here and there. (Most of the bigger rifle slugs, (easy pickens) have been detected I believe.) Anyway- If anyone can tell caliber and makes by the picture below I'd love to hear a definative or even a good guess. Those are 12 ga Rem New Club bases and two weaties and a nickle for size estimating...
Thanks- 1more.
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[rovnrbl53]

the bullet on the left looks to be a .54 Sharps (CW)...the bullets on the right look like modern .38s to me - check and see if they have fine vertical lines in the recessed groves....those indicate modern bullets.