2A1 Ishapore terrible accuracy + other problems

[Bruce_in_Oz]

Has anyone hereabouts gauged the throat / leade in a 2A / 2A1 barrel?

The simple expedient of extending the freebore will reduce the peak pressure and the slightly flatten the overall pressure curve.

For that matter, how tightly throated is the L-42A1? That cited example of one "blown up" by M-118 Match may be a a rabbit-hole to explore.