CREATE TABLE table_29166 ("Chambering" TEXT, "P1 diameter  ( mm ) " TEXT, "A external  ( cm 2  ) " TEXT, "P max  (  bar  ) " FLOAT, "F bolt  (  kgf  ) " FLOAT, "F bolt" TEXT)

What is the p max (bar) in the pistol where the chambering is .45 ACP?
SELECT MAX("P max ( bar )") FROM table_29166 WHERE "Chambering" = '.45 ACP'
SELECT MAX("P max ( bar )") FROM "table_29166" WHERE "Chambering" = '.45 ACP'