What is the  p1 diameter (mm) when .300 lapua magnum is the chambering?
CREATE TABLE table_26967904_2 (p1_diameter__mm_ VARCHAR, chambering VARCHAR)
SELECT p1_diameter__mm_ FROM table_26967904_2 WHERE chambering = ".300 Lapua Magnum"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26967904_2 (p1_diameter__mm_ VARCHAR, chambering VARCHAR) Question: What is the  p1 diameter (mm) when .300 lapua magnum is the chambering? [/INST] SELECT p1_diameter__mm_ FROM table_26967904_2 WHERE chambering = ".300 Lapua Magnum" </s>