India and the US are exploring the development of an extended-range, longer barrel variant of the M777 155 mm/39 calibre ultra lightweight .... The last .A Leopard tank's 120mm cannon has an effective range of about 2.M777 howitzer has a 13-mile range, more than 5 times as far..
Now, as a note, the maximum range of the M777 of ~25 miles are not due to its normal artillery shells fired, but due to the use of the GPS " .... M777 howitzers made in the USA and a towed howitzer FH-70 made in the UK.. https://doi.org/10.1093/gerona/57.12.m772.. .They said the missile ....
The M777A2 is capable of firing standard. (unassisted) projectiles to a range of 15 miles (24 kilometers), assisted projectiles to 19 miles (30.5 kilometers), ....