Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Dual-Purpose Improved Conventional Munition
Table title:
United States DPICM projectiles
Table:
<table id='hittask' contenteditable='False'>
<tr> <td colspan=1 rowspan=1 > Projectile </td><td colspan=1 rowspan=1 > M483A1 </td><td colspan=1 rowspan=1 > M864 </td><td colspan=1 rowspan=1 > M915 </td><td colspan=1 rowspan=1 > M916 </td><td colspan=1 rowspan=1 > M444 </td></tr>
<tr> <td colspan=1 rowspan=1 > Caliber </td><td colspan=1 rowspan=1 > 155 mm </td><td class="highlighted"  colspan=1 rowspan=1 > 155 mm </td><td colspan=1 rowspan=1 > 105 mm </td><td colspan=1 rowspan=1 > 105 mm </td><td colspan=1 rowspan=1 > 105 mm </td></tr>
<tr> <td colspan=1 rowspan=1 > Service date </td><td colspan=1 rowspan=1 > 1975 </td><td class="highlighted"  colspan=1 rowspan=1 > 1987 </td><td colspan=1 rowspan=1 > 1998 (?) </td><td colspan=1 rowspan=1 > 1998 </td><td colspan=1 rowspan=1 > 1961 (production ended early 1990s) </td></tr>
<tr> <td colspan=1 rowspan=1 > Range </td><td colspan=1 rowspan=1 > ? to 17 km </td><td colspan=1 rowspan=1 > ? to 30 km </td><td colspan=1 rowspan=1 > 10 km to 14 km </td><td colspan=1 rowspan=1 > 3 km to 11 km </td><td colspan=1 rowspan=1 > ? to 11.5 km </td></tr>
<tr> <td colspan=1 rowspan=1 > Load </td><td colspan=1 rowspan=1 > 64 × M42 24 × M46 </td><td class="highlighted"  colspan=1 rowspan=1 > 48 × M42 24 × M46 </td><td colspan=1 rowspan=1 > 42 × M80 </td><td colspan=1 rowspan=1 > 42 × M80 </td><td colspan=1 rowspan=1 > 18 × M39 (M444E1 used M36) </td></tr>
<tr> <td colspan=1 rowspan=1 > Weight projectile (fuzed) </td><td colspan=1 rowspan=1 > 46.5 kg </td><td colspan=1 rowspan=1 > 47 kg (approx) </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 14.97 kg </td></tr>
<tr> <td colspan=1 rowspan=1 > Length (fuzed) </td><td colspan=1 rowspan=1 > 937 mm </td><td colspan=1 rowspan=1 > 899 mm </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 371.9 mm </td></tr>
</table>
Question:
What are the caliber and load of the M864 projectile and when did it enter service?
Answer:
The 155 mm M864 projectile entered service in 1987 and carries M42/M46 load.