if your deducting the FMV of the capital gain property the actual limit is 50% of AGI
if you reduce the deductions for capital gain property to cost you get a 60% deduction see IRS pub 526.
worksheet 2 in the pub
example from pub 526
Example 2. You donated clothing to your church with a fair market value of $200. The limit based on 60% of AGI doesn’t apply because the contribution is not cash. Instead, a limit based on 50% of AGI discussed later will apply to the contribution to the church because it is an organization described earlier under First category of qualified organizations (50% limit organizations).
