260 ackley improved really worth it?

[J E Custom]

What velocities could a person expect pushing the 130 out of a 22" tube?

My 260 AI has already exceeded 3000 ft/sec with medium powder charges. The standard 260 can reach 2850 with the 130 grain bullets and still stay below 60,000 Psi. The AI version is between 150 and 200 ft/sec faster at the same pressures.

Barrel quality and length can influence these velocities by 50+ft/sec but they should be close.

J E CUSTOM

 

[jackthebear]

You're getting 3000 out of a 22@ tube?

 

[jackthebear]

Actually, When I build any AI cartridge, I cut the chamber like PO Ackley intended us to do and realy there is no need to go through the fire forming process when the SAMMI ammo can be fired in that chamber with very good accuracy and hunting with standard ammo and fire forming to the improved case dimensions at the same time is normal.

If you buy new brass, it can be loaded with near maximum charges and used to hunt with. After that, the improved case is ready to load with the new case in mind. If cut properly, the parent cased ammo can be fired in an Ackley chamber with less than 1 MOA accuracy so you can take advantage of this feature and save time and money and not waste components. On good quality barrels break in normally takes 7 to 10 shoot and clean shots and at that point, hunting can finish the brake in, minimizing useful barrel wear.

If you shoot and clean often (After 3 to 5 shots) break in should not take over 30 to 50 rounds to reach the barrels potential. So why not do the brake in while hunting. Plus if you forget to take the AI ammo, you can buy parent cased ammo and not ruin your hunt. (You would be suppressed how many times someone has left their ammo at home.

J E CUSTOM

Specifically, How did P.O. Ackley intend to have the chamber cut?

 

[J E Custom]

Specifically, How did P.O. Ackley intend to have the chamber cut?

His intention was to be able to fire the parent case with great accuracy in the AI chamber and at the same time improve the case design and capacity. this is accomplished by short chambering the AI chambering .004 so the parent case will be held in place while the fire forming takes place. This process also prevents the cartridge from lengthening very much during fire forming. (Common with wild cats and poorly head spaced chambers).

My experience with the Ackley's have proven that initial case growth has been less than .006 thousandths when fire forming and almost non existent (.001 or .002 on repeated firings). All but eliminating thinning and frequent trimming.

J E CUSTOM