How many  external (cm 2 ) are there for the .338 lapua magnum chambering?
CREATE TABLE table_26967904_2 (a_external__cm_2__ VARCHAR, chambering VARCHAR)
SELECT COUNT(a_external__cm_2__) FROM table_26967904_2 WHERE chambering = ".338 Lapua Magnum"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26967904_2 (a_external__cm_2__ VARCHAR, chambering VARCHAR) Question: How many  external (cm 2 ) are there for the .338 lapua magnum chambering? [/INST] SELECT COUNT(a_external__cm_2__) FROM table_26967904_2 WHERE chambering = ".338 Lapua Magnum" </s>