[ConnorMcLeod]

Any reason you set bpammo on CmdStart ? (Could use AmmoX message, when ammo is > 1, set it to 1, for example)
Sent from UpdateClientData :

Spoiler

void CBasePlayer::SendAmmoUpdate(void)
{
	for (int i=0; i < MAX_AMMO_SLOTS;i++)
	{
		if (m_rgAmmo[i] != m_rgAmmoLast[i])
		{
			m_rgAmmoLast[i] = m_rgAmmo[i];

			ASSERT( m_rgAmmo[i] >= 0 );
			ASSERT( m_rgAmmo[i] < 255 );

			// send "Ammo" update message
			MESSAGE_BEGIN( MSG_ONE, gmsgAmmoX, NULL, pev );
				WRITE_BYTE( i );
				WRITE_BYTE( max( min( m_rgAmmo[i], 254 ), 0 ) );  // clamp the value to one byte
			MESSAGE_END();
		}
	}
}

May be you could add a define to disable colorchat ?