What is a 257 Ackley Improved?

257 Ackley Improved is a wildcat cartridge, so there is no SAAMI spec for maximum overall cartridge length (COAL). We chose COALs that allowed us to maximize case capacity. Check that the COALs listed for this cartridge will allow the round to fit and feed properly in your particular rifle.

Can you shoot 257 Roberts in 257 Ackley Improved?

You can load and fireform for any AI… In the 257 Ack. you can shoot new 257 Roberts ammo, it fireforms to your chamber….

What is the difference between 257 Roberts and 257 Roberts +P?

Improved cartridges One of the common improvements is called the . 257 Roberts +P which has a SAAMI maximum pressure limit of 58,000 psi (400 MPa) compared to the 54,000 psi (370 MPa) listed for the standard . 257 Roberts.

What is the best caliber for mule deer?

270 Winchester is arguably the best caliber for deer in North America. The 270 Winchester Short Magnum (270 WSM) fires the same . 277” diameter projectiles as the . 270 Winchester, but the 270 WSM has a shorter and fatter case that can hold a little more powder.

What made the Ackley 257 Roberts so good?

According to P.O. Ackley, the modified 257 Roberts was likely the best improved round compared with the couple dozen or so factory cartridges he’d experimented with Ackley’s signature case modifications included reducing the body taper and increasing the shoulder angle—both significantly!

What is the best case shape for a 257 Ackley?

You can easily fireform 257 Roberts factory brass or loaded rounds to achieve the .257 Ackley Improved case shape. By his own admission, P.O. Ackley considered the .257 Ackley Improved to most likely be his best wildcat.

Is the 257 Ackley overrated?

A: In my opinion the .257 Ackley is badly overrated. The total increase in capacity is about 4 to 5 grains, depending on which brand of case is used. It burns roughly about 8 to 10 percent more powder to increase velocity around 5 percent. With modern powders you may gain 100 fps with a 100gn bullet.

How good is a 257 AI?

I can do a 257 AI and make a sleeve for the seating die. The 257ai is one of the good ackleys, first ackley i ever had, but its still a 25cal. How bout a 6.5×55 improved or a 7x57ai?