Originally posted by olarmy:
quote:
Originally posted by stepchild 2:
quote:
Originally posted by olarmy:
Stepchild. How much velocity increase do you see from a 257AI, compared to a standard Roberts, loaded to the same pressure?
Who says they have to be loaded to the same pressure? I don't have any way to measure pressure, guess i'll have to take Speers word for it. All I know is cases last a long time and they are very accurate.I know it's hard to believe that a lowly .257Ackley very much improved is faster than most .257 Weatherbys and on less powder. It's called efficiency.
According to Parker Ackley, there is a maximum case size for a given bore size and beyond that it's called overbore capacity, more powder for little return. Parker Ackley was way ahead of most gun experimenters and he admitted that some were not much better than factory.
I also have a 22/250AI that goes 3,998 and shoots .228" groups and kills deer DRT with Sierra 55gr. varmint bullets.
As a side note, Parker Ackley hunted Elk with a .220 Swift, using Ackley Controlled Expansion bullets.
Stepchild
Thanks for sharing the info. The reason that you would need to load both to the same pressure is to compare the potential of each cartridge. IMO, you can't load one cartridge to a higher pressure than another, and then shoot it in a 27" barrel and declare that it is a far superior cartridge.
If you put a standard Roberts in a 27" barrel, and loaded it to the same pressure as your AI, the bob would come pretty close.
You mentioned Speer #8 listed 57gr of N205 as max. Speer #9 lists 54gr as max. Maybe they learned something.
And Speer #10 with the standard Bob shows 3292fps with a 100gr bullet. I've had no problem getting 3250fps from a standard Roberts and a 24" barrel (in a pre64 with a short magazine and a short throat). Stretch the barrel to 27+ inches, and I bet it would be pretty dang close to your load.
Olarmy,
As far as the reloading manuals of today, They are written by the company lawyers to avoid law suits. There are gun owners out there that could screw up an anvil, a little common sence helps a bunch.
I use loading manuals as a starting point and go from there, using accuracy as the most important and velocity as secondary but when the two come together, it's a beautiful thing!
Thanks for the reply and keeping it civil. I have nothing at all against a .257 Roberts.
Ray Atkinson and many others have killed game with a 25/20 and 30/30's just not my style.
One time, out side of Buffalo,Wy, my cousin shot at a rather large Mule Deer and the bullet hit 10-15' in front if the deer an it presented another broad side shot, I sat down and held on the spine and down he went, I don't know what he had loaded in his Roberts but my Ackley on that occasion shot much flatter using 57gr of MRP and a 100gr.Sierra spitzer. This deer was around 500 yards, no exageration.
To each his own, But for me it's Ackley, now on the other hand, I had built a 243AI and didn't expect much velocity improvement because the case didn't have much taper to it but my Cousin had the reamer and it seemed like the thing to do.
The best to you and yours.
Stepchild
I love my AI's, but when compared fairly, they aren't THAT much better than the standard. Sure is nice to "never" have to trim brass, tho.
