Post by: lhrbull on July 29, 2013, 08:58:36 PM
Post by: shrek on July 29, 2013, 09:10:14 PM
Post by: TVHunts on August 01, 2013, 08:47:30 PM
Post by: Don Fischer on August 01, 2013, 09:47:40 PM
Post by: lhrbull on August 04, 2013, 08:31:34 PM
Post by: Biggerhammer on August 04, 2013, 09:03:14 PM
When cchambering a cartridge that is actually shorter(shoulder) and or slimmer case taper than the chamber it is going to be fire formed to. Especially if the it is a non belted case, there is nothing for it to head space off of and the Remington ejector is putting pressure on the case base and it is held ever so slightly away from the bolt face. This gives unpredictable brass movement when fire formed, with the bullet slightly seated into the lands it forces the case base flat/ flush against the bolt face for a good solid, accurate fire forming.
Here is a example of a case head failure while fire forming Bell .404 Jeffery brass to 450/.375 Ultra Magnum. This was fired with a group of twenty I was forming that day. It was the first round I had seated for fire forming with 500gr Hornady's into the lands. The first bullet I seated was to deep, I made a seating die adjustment and loaded the rest. Got distracted by a six year old daughter and forgot to pull it and re seat the bullet. 19 of them formed up exellent, this one went off with a odd "WHOP" and allot of smoke out of the bolt. Spooky stuff when your face is right by a 500gr bullet on top of 102 grains of powder. Wildcats or fun but serious stuff, some are not very complicated others take a little know how.
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fi90.photobucket.com%2Falbums%2Fk269%2Flandonmoses%2FIMG_4311.jpg&hash=5f9c7da41ef4559ab453116a81ace845bc2546c4)
Post by: jay.sharkbait on August 04, 2013, 09:12:19 PM
Post by: Biggerhammer on August 04, 2013, 09:32:22 PM
There are several options, neck up .270 Winchester brass. Some guys that are really into their .280 AI's take the time to form their brass fro quality 30-06 Lapua cases. The 30-06 Lapua cases are much more involved and come out slightly short.
Post by: mountainman on August 05, 2013, 07:56:21 AM
Bottom line is, he is not forming a .280 AI. He is forming a 280 RCBS Improved. They are not to the same spec, two different cartridges. One would have to look up a chamber/case print to confirm if the shoulder Juntion is being moved forward when formed or if the shoulder angle and slight case taper are the only changes upon fire forming.
If I recal correctly, I think the only difference is shoulder angle. Shot and owned allot of wildcats. Started with a 25-284, 27 years ago.😉
Either way, factory loads can be fired to get the finished case. Only difference between the 2 in the shoulder angle, the Ackley being at 40 degrees, the Huntington RCBC is his standard 30 degree. :)
Post by: Biggerhammer on August 05, 2013, 09:05:06 AM
Post by: mountainman on August 05, 2013, 10:43:33 PM
Post by: jay.sharkbait on August 05, 2013, 11:03:31 PM
I could see that with a radical dimensional change such as moving the shoulder forward as in a full wildcat, but the joy in an Ackley is you only change taper and shoulder angle, easily accomplished by just shooting them. You still need a die set to reload, so no saving in components. Cost for the " Hydraulic" (not hydrolic) starts at $175, but is not needed, and the time consumption of drying the case if water is used, or removing residue if an oil is used, well, a whole lot of extra work and cost for a problem that isn't there. Just shoot them factory and reload them wildcat...too simple!
So what factory load do you suggest using to form .450 Ackley?