Is this a good caliber....I have not idea what it is like....I am thinking about getting a barrel for my gun that is in this cal. I usually use the gun for groundhog hunting.... would this be good for it.....or at least does anyone know of any good cal. reveiw websites.... thanks

.23-40 never heard of it

Check if thats right

Johnch

It definitely is a cartridge. Varmint Al mentioned it on his website.



DIFFERENCE BETWEEN 23/40 AND 223 ACKLEY IMPROVED.... My Stolle Panda is a 23/40 and it is slightly different than a 223 Ackley improved. Both have a 40° shoulder, but the shoulder location is different. I don’t recommend getting a 23/40 because it is much more difficult to make the brass compared to the 223 AI.Left to right is a 223 Ackley Improved, 223 Rem, and the 23/40. The 23/40 holds a bit less powder than the 223 AI because it preserves the 223 location of the intersection of the case body and the shoulder. This leaves a longer neck. You can't chamber factory brass in the 22/40 chamber. The cases are more difficult to make because the forming dies have to be used before you can chamber the round the first time. The 223 Ackley Improved has a 40° shoulder with the intersection of the shoulder and neck preserved from the original 223 location. With the 223 Ackley Improved, you can chamber factory rounds and fire-form without using forming dies. I have made 300 "fitted-neck" cases for my 23/40 and it was a lot more work than it would have been with a 223 Ackley Improved, but they work great and will last indefinitely. On loading data for the 23/40, the standard 223 data times 1.1 is pretty good. I use a load of 25.3 gr. of H322 and the Nosler 40 gr. Ballistic Tip bullet. It gives about 3500 fps and is spectacular on ground squirrels out to 300 yards. This is a mild, but accurate load. The Stolle Panda and the heavy fluted barrel is a bit heavy to carry around in the field.

Longrifle, can you post ballistics to compare these three?Thanks.

I'll see what I can dig up.

10-4, Rebel

I have found very little info on it. It seems almost identical to the 223 AI. But the Ackley brass is much easier to make. That is probably why it is so rare. It does nothing better, and is harder to make brass.

Personnally I have never heard of it but based on the info that Longrifle1000 has posted I would strongly suggest sticking to a plain jane 223. The 23/40 sounds like it is way too much trouble for the slight improvement in velocity you would get out of it.

Do yourself a favor and go 22-250 AI. None better.