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I fireform mine. 29.4gr varget under a 105vld shot my fair share of sub 1.5" groups at 400
I fire form my 6BRX brass during our club's 600 yard F open matches. With the right load you would be amazed how competitive it can be. You still need to fire form the brass after you hydro form them. I have done it both ways and saw difference in accuracy.
.020" and 450s.How much jam? Which primer? Thanks.
What method did you use to hydro form that required the cases to STILL be fire formed?
I am looking for the method that produces consistent and repeatable shoulder lengths and case volumes.
i fire formed 100 cases and i hydro formed 100 cases
FF i used 30gr of 2208/varget with cci450 and BR4 primers , 105 gr hybrids jammed .020 with .005 neck tension and they turned out great and shot well at 500m/547y
View attachment 1019952
i then did my load testing on them and found a load of 32.4gr of 2208/varget, 450s, 105gr hybrids
i then hydro formed 100 cases and used my load that i worked up to finish them off and shoot at the a club comp (32.4gr powder 450s 105gr hybrids .010 off the lands)
View attachment 1019951
they shot a 1.8 inch group at 500m/547y, so they were no different to my worked up FF cases
but the hydro formed cases were more consistent length than my FF cases, with in a few thou where as the FF cases had up to .006 difference in length
I use Whidden's hydro die and his method works very well. The critical part is to form the shoulders .010 to .015 thousandth further than necessary, then use your sizing die to flatten out the shoulder just enough to give a slight crush fit. Then you can seat the bullets where they are accurate.
This is the direction I'm looking at.
Hydro form first then size with a Whidden FLS die.
I use Whidden's hydro die and his method works very well. The critical part is to form the shoulders .010 to .015 thousandth further than necessary, then use your sizing die to flatten out the shoulder just enough to give a slight crush fit. Then you can seat the bullets where they are accurate.
There is not a hydro former made for any caliber that will fit your chamber perfectly, so you still need to fire form them (after hydro form) to make them fit your chamber exactly. Some shooters do not consider brass completely fire formed until it has been shot at least 3 times.What method did you use to hydro form that required the cases to STILL be fire formed?
I am looking for the method that produces consistent and repeatable shoulder lengths and case volumes.
How do you go about determining the amount of crush fit?
Thank a bunch everyone!! Deeply appreciate it!
After expanding the neck (0.257 for me) then I used a Forster 6BR, FL, non-bushing die and sized a small amount of the neck and then tried to chamber the brass. Assuming that it did not chamber, I screwed down the die a little then tried to chamber again. Inched down the die until I could chamber the brass without stupid force, but with decent resistance. If you can chamber it easily you've screwed the die down too far. Once I had it set correctly, I set the lock ring and started sizing cases. Early on, I double checked a few by chambering them to make sure it was still set correctly, but once I felt good, I did a few hundred at a time.