Swelling data for V-4Cr-4Ti and V-(8-10)Cr-(5-6)Ti alloys in the temperature range of 420-600 C and the helium concentration range of 0-75 appm. The recommended design correlation for V-4Cr-4Ti is indicated by the solid line. The curve is an upper bound to the V-4Cr-4Ti data, a reasonable bounding curve to the higher swelling V-(8-10)Cr-(5-6)Ti alloys, and follows the general shape used to describe V alloy swelling. Data for V-15Cr-5Ti (not shown) which have been used to support low swelling at high neutron damage levels include: near-zero swelling at 114 dpa and 420 C; negligible swelling for ion irradiations up to 250 dpa and 800 C; and negligible swelling for dual-ion irradiations up to 200 dpa, 725 C and 1500 appm He.