What is the p max ( bar ) for the 6876 f bolt ( kgf )?
CREATE TABLE "bolt_thrust_estimations_for_various_rifl" (
  "chambering" text,
  "p1_diameter_mm" text,
  "a_external_cm_2" text,
  "p_max_bar" real,
  "f_bolt_kgf" real,
  "f_bolt" text
);
SELECT MIN("p_max_bar") FROM "bolt_thrust_estimations_for_various_rifl" WHERE "f_bolt_kgf"=6876;