The most accurate B.R. shooter I know (currently holds a world record and has held several) shoots with virtually no neck tension.
.2. Though many of the competitors discuss how critical neck tension is, no one mentioned annealing. Doesn't mean that they don't do it
I have given up on reloaders because it so difficult to get them away from the key board. And; they would have to find some way to measure the effort necessary to seat a bullet as in before annealing and again after annealing with a tool that does not exist as in a seating die that measures bullet seating effort in pounds!!!! Wait! THE PRESS DOES EXIST, problem, it measures in pounds
The most accurate chrono testing is done in a machine rest.now lets see them do some real world testing with a good chrono by a world class shooter because that is the only test that matters
The most accurate chrono testing is done in a machine rest.
I found the above 2 items seemingly in conflict, hammering the round into concentricity seemingly would affect neck tension. And in 4 pages of content which talked extensively about low sd, runout and neck tension i found it curious that there was no mention of annealing by anyone.
Hence light neck tension better accuracy in theory
1stmar said:I should have qualified my comments. If brass was new or perhaps 1x fired the modulus of elasticity would be larger than if he were on say the 4 or 5th firing (if i understand nicks post properly) over the long haul the modulus of elasticity shrinks and those same rounds w .003 of neck tension may not perform the same way due to springback, or inconsistent neck tension.
The above is why, ideally, annealing is taken just far enough to stress-relieve the brass, but not far enough to soften it much. You want tighter fitting necks to hold on harder and not start to take the permanent bend at a wider diameter. Harder hold on the bullet raises the starting pressure of a cartridge, the same as crimping does. Raised start pressure gives the powder more time to get its pressure up enough for the burn to be consistent.
Harder hold on the bullet raises the starting pressure of a cartridge, the same as crimping does.