Fireforming is no "effort", just find the most accurate load and go kill stuff.....that load will be considerably faster than a std 22-250.
No it wont be, while fireforming you can make very accurate loads but they will be slower because of all the energy lost in blowing the brass out to fit the chamber, they are slower than a std 22-250 in every situation with reasonable pressure
Yes it will be. Work up an AI fireform load starting at top end for the std. cartridge. Accuracy will be with more powder and it'll absolutely and for sure be faster. My best ever 22-250 load is a 50@3925. A 22-250AI fireform load will be 4000-4100 with 50's.
I'm afraid that boatanchor is correct, ANY fireforming load will be slower than the std cartridge because more energy is used in blowing out the cartridge to fill the chamber.
I use this method for 22-250AI, 257BobAI and 375Weatherby, not once has my chronograph shown an increase in velocity, in fact the exact opposite is true, a decrease of more than 100fps or more is normal.
How do you get more powder into the original case for fireforming, just curious?
Every book I've read suggests using a faster than normal powder for sharper pressure build up, this also reduces velocity.
Cheers.
