If my 20VT has a long throat .....

[BaconFat]

What about making custom fit brass from .223 and let the neck be as long as it needs to be. I've measured as many ways as I can figure and with seating close to the lans, I'm only seating the bullet around .100" into the neck. I did my first 25 round barrel break-in shooting with the ogive .110" off the lands, which also allowed me to eject the round. I followed up with another 25 rounds seated longer with no ill effects. Being that the barrel was new and I'm still not a very good shot, I didn't expect great accuracy although I did shoot a couple of "figure eights".

So while I'm getting ready for load development, I was trying to determine what I wanted to do about seating depth. I realize I can chase the lans only so far as throat erosion will make me seat the bullets quite a ways off the lans eventually. Then I got to thinking, what if I made my 20VT brass out of .223 brass then I could let the neck be as long as the chamber could use. Is this a feasible idea?

 

[pacificman]

Yes you can allow your brass to be as long as your chamber will allow...but you would want to be careful and make sure the neck of your brass case does not protrude into the throat... or your chamber pressures will be very high and dangerous as I'm sure you know. You will need to know exactly what your chamber dimensions are. Nothing wrong with bullets jumping to the lands if your getting good accuracy. Most all my rifles shoot best with some jump to the lands. My .204 jumps .48 thousands with .6 to .7 accuracy at 200 yards witch I am very happy with.

 

[BaconFat]

What I am planning on doing is getting a Sinclair chamber length gage. Then I'll know if I can make any adjustments to the length of the neck.