gixer1 Posted September 4, 2011 Report Share Posted September 4, 2011 Firstly I don't at this time reload as it's not really required for what I use/shoot etc, but I was wondering if fire forming only works on the length of a cartridge as per 243 AI or if some are formed width wise too? The reason I ask is obviously some people say it's ok to use 22LR in a 22 WMR yet the I was always told not to....but in essence would this not be the same in a way as fire forming? Except obviously the cases would never be used again... I have a 22wmr Winchester 9422M and it would be a great plinker/rabbiter if only 22LR's could be used....and I did once speak to a guy in a gun shop that had this same rifle and had used 22LR's in it "for years" much to his horror when I showed him the page in the manual that says "only use 22Wmr ammo in this rifle" but it does make you wonder how dangerous it really is? Regards, Gixer Quote Link to comment Share on other sites More sharing options...
Ackley Posted September 4, 2011 Report Share Posted September 4, 2011 The term fire forming in firearms refers to the process of reshaping a metallic cartridge case to fit a new chamber by firing it within that chamber.[1] This might expand a cartridge to a new size, such as a wildcat cartridge, or just to the chamber of a specific gun. Fire forming a wildcat differs from the normal manufacturing process; in that it relies on firing a loaded cartridge of differing dimensions than the chamber which it is being fired in. After fire forming, the spent case will take on the new dimensions of the firearm's chamber. Fire forming is the final process in creating a wildcat or an improved cartridge. There are two methods of fire forming. One method is to cold form a parent case using forming dies, creating some form of headspace, load the case and fire the cold formed cartridge in the chamber of the firearm. This first method is the most common and will create a wildcat cartridge. The second method is to fire form a factory cartridge by using its factory headspace to headspace on. The factory cartridge is then fired in the chamber of the firearm. This second method will create an improved cartridge. Quote Link to comment Share on other sites More sharing options...
kent Posted September 4, 2011 Report Share Posted September 4, 2011 No you cant elongate .22 lr and why you cant reload the case anyway. One should always examine the reason to Ackerly a case very carefully, often the gain is not there unless you go for a realy long barrel you just make work for yourself. When Ackely started improving cartriges chronographs were far from common and many velocity gains claimed were very optomistic to say the least Quote Link to comment Share on other sites More sharing options...
Bewsher500 Posted September 5, 2011 Report Share Posted September 5, 2011 the biggest problem with using LR in WMR rifles is the case size. WMR is .224 in bore but the case is wider. there is a step out from bullet to case LR is .224 in outer case diameter and the case cuts into the bullet at the base. the bullet base is less than .224 it would probably chamber OK but you are relying on a smaller rim to the LR than would normally sit in the lip of the barrel. It may split when fired, again not that uncommon in rimfire as they are wafer thin, but all this may leave you with stuck cases in your breech. if the physical chambering worked ok you may find it difficult to chamber a WMR after firing several LR as they will be leaving a lot of deposit around the area of the WMR chamber that the WMR case sits in. The LR bullet would also be a long way back from the rifling which may leave you with shoddy grouping...then again it may not Quote Link to comment Share on other sites More sharing options...
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