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HI

Have a 22/250 factory HB (Winchester) that I am considering making into a 22 BR Norma .



The factory barrel is 24 inches & I think 1:14 twist (?? on the twist). When the chamber is cut off and re-chambered it should come out at around 22 inches.



I need is a Redding body die converted to a bushing die to be able to form and load. Correct?? Y/N??



The action will be a Tikka Whitetail that I have lying around



I thought of this as a trial- If I can get it to group in 22 BR 0.6 (or less ??) in the old factory barrel it will be worth spending the $$ and put on a real barrel and still have a fire forming barrel.



In your learned opinions how much velocity would I loose by making a 22 BR on a 22 inch barrel?



I am trying to get 3500+ fps with the 55 NBT or V-max-- possible with a 22 inch barrel? (Varmints Sub 400 yards)



Is it worth building a 22 DASHER (22 BR Ackley Imp) on a 22 inch barrel?? Gun smith has both reamers?



So IYHO it�s worth a try or not?

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Worth a try, yes, especially if the .22-250 barrel shot within your expections.



22" barrel from 24 may be a bit optimistic. You might want to consult your gunsmith if you have not done so already. More typical is 20-21". Still, even at 20" it's worth doing. Benchrest barrels are just a hair longer than 20" and are good for 300 yard shooting for small group an agg objectives so you still have plenty of bbl to work with.



I think the only die you'll need is a .22 BR FL die. Just use some sizing wax and some 6BR (lapua is my preference) cases and you'll be set. You may need to anneal the necks but Lapua brass is pretty soft, you'll also need to trim the cases but that should be about it.



Average velocity loss / inch of barrel is around 30fps. That said, real velocity gains/losses are both caliber and powder dependant. The .22 BR is a highly efficient case therefore you will will probably see a velocity loss of less than 30 fps/inch. I'd guess total difference for 22 vs. 26" might be 80-100 fps. Then again, with the .22BR you can proably load it for hunting vs. loading for group and still get sub MOA performance at relatively hot velocities. It's a very accurate cartridge, much more so than the .22-250 (which isn't bad in and of itself). With a .22 BR the case is so efficient that just about any reasonable load you try will work pretty well, some will just astound you. I shoot a 6BR and the worst group I ever got from it was with a Hornady 87 gr. BTHP at 1.5". I was disgusted and insulted by that bullet. Everything shoots, and with a bit of research and tweeking performance is downright unfair regarding what you can do to prairie dogs who insist on crouching with one eye exposed at 300 yards. A lot of folks eschew the BR calibers as being esoteric. In my experience, shooters opting for a BR rarely go back to a .223 or a .22-250. Accuracy is an addictive pursuit.



.22 Dasher? I'd avoid it. At some point you might want to explore an Improved caliber for varminting just to have that experience under your belt but there is a lot to be said for brainless reloading of a caliber that requires no special treatment. That said, you'll get some experience necking down with this chambering. Having to fireform cases gets a bit tedious after a while. Using a standardized chambering is nice because it's easy. If you're doing this for performance improvements keep in mind that you're barrel is shortened thus increases in case capacity have diminishing returns. It's your choice but I see no practical advantage in the situation you describe to moving in this direction.



re5513