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.256-06 Improved / 6.5mm-06 Improved (P.O. Ackley Data)

Warning! Notes: Standard twist: 10". Special twist: 12", 14". The 6.5mm-06 Improved, sometimes called the .256-06 Improved is obviously not as efficient as the standard 6.5mm-06 which tends to indicate that the maximum efficient case capacity has been reached and that the 6.5mm-06 Improved is somewhat over bore capacity thus resulting in not quite as efficient cartridge as the standard version. The following loads bear this out because these were made in the same barrel, by first chambering the barrel for the standard 6.5mm-06, then later it was rechambered for the "improved" version so that a good comparison was obtained for the two cartridges in the same barrel. (Handbook for Shooters & Reloaders/Vol. 1 - P.O. Ackley, 1962) NOTE: USE THIS DATA WITH EXTREME CAUTION

Be Alert: Publisher cannot be responsible for errors in published load data.

Wt.	Bullet	Powder Manufacturer	Powder	Charge	Velocity (FPS)
120		IMR	IMR-4350	Subscribe	3100
Remarks:
120		IMR	IMR-4350	Subscribe	3275
Remarks:
140		IMR	IMR-4350	Subscribe	2920
Remarks:
140		IMR	IMR-4350	Subscribe	3095
Remarks:
140		IMR	IMR-4831	Subscribe	2950
Remarks:
140		IMR	IMR-4831	Subscribe	3065
Remarks:
150		IMR	IMR-4350	Subscribe	2780
Remarks:
150		IMR	IMR-4350	Subscribe	2915
Remarks:
150		IMR	IMR-4831	Subscribe	2760
Remarks:
150		IMR	IMR-4831	Subscribe	2915
Remarks:
165		IMR	IMR-4350	Subscribe	2550
Remarks:
165		IMR	IMR-4350	Subscribe	2600
Remarks:
165		IMR	IMR-4831	Subscribe	2550
Remarks:
165		IMR	IMR-4831	Subscribe	2650
Remarks: