Originally Posted by AZShooter
You didn't mention the action length. SA dictates you use the 284.
Is this rifle going to be a repeater or single shot? I am asking because the 168 and 180 VLDs are quite long. If it is going to be a single shot it is no big deal. Otherwise the 280 AI may require a custom action to accomodate the length and still feed from the magazine. For optimal performance with either case you should consider a custom reamer.
There is an improved version of the 284 win called the 284 Shehane but technically it shouldn't be called an Ackley Improved. Bill Shehane designed the case's body-taper a bit larger about .010", but didn't change the shoulder angle from the original 35 degrees. It is supposed to add around 3.35 grains of powder. I have a friend who made one for long range shooting and said it wasn't worth the effort. FYI just by using RL-17 you can gain more velocity over the usual H4831 and 4350s.
As for the 280 AI I cannot tell you as much as I am not familiar with it. Perhaps someone else can add to this thread.
Here is a link for some reading about the various short action 7mms:
7mm Cartridge Guide
Thanks for the input AZShooter,
I intend to use a long action that I have. I will be using the rifle as a single shot by installing a removable follower.
I have read about the .284 Shehane and when I go to the expense, I will have a reamer made in the Ackley Improved. I will have custom dies made also.
I have a .280 AI in a hunting rifle setting that does real well. It has a much shorter barrel, 26", than I want for my target rifle but it still holds up at 1000 yards. I think that one reason that I am interested in the .284 Win. AI is because of the performance that I have seen in the .280. I am thinking that with the possibility of more case capacity, thus comes more velocity and being able to capitalize on the high BC of the .284 bullets.
Can someone tell me the case capacities on both cartridges. If you only know one please post as someone else may know the other one.
Thanks again and keep the posts/comments coming! BK