Table:
text: 6 mm caliber
.264in (6.6mm) and up
.264in (6.6mm) and up
Name_ Bullet Length_ Base Shoulder Neck
6.5 x 50 SR Arisaka 6.705 (.264) 50.39 (1.984) 11.35 (.447) 10.59 (.417) 7.34 (.289)
6.5 x 53.5 R Dutch Mannlicher 6.756 (.266) 53.59 (2.110) 11.48 (.453) 10.75 (.423) 7.55 (.297)
6.5x54 mm Mannlicher-Schönauer 6.705 (.264) 53.65 (2.112) 11.47 (.452) 10.87 (.428) 7.56 (.288)
6.5x55mm Swedish (aka 6.5x55mm Krag) 6.7 (.264) 54.864 (2.16) 12.17 (.479) 10.688 (.420) 7.468 (.294)
6.5x58 mm Vergueiro 6.65 (.262) 57.85 (2.278) 11.88 (.468) 10.94 (.431) 7.56 (.298)
6.5 x 68 6.70 (.264) 75.02 (2.956) 13.30 (.524) 12.18 (.480) 7.60 (.299)
6.5-284 6.70 (.264) 55.118 (2.170) 12.725 (.501) 12.065 (.475) 7.544 (.297)

Question: What neck measurement is the gun with a shoulder measurement of 10.688 (.420) for caliber 6mm '264 in 6 6mm and up?

Question: What is the length of the 12.18 (.480) shoulder rifle in 6mm 264 caliber in 6.6mm and above?