Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT p1_diameter__mm_ FROM table_26967904_2 WHERE chambering = ".300 Lapua Magnum"