Boyd Allen
Active member
Hi Charles,
I think that I said that chambering a crooked round (thin turned neck, bullet with pressure ring, approx. .00015 clearance in chamber or less, loaded to a length that significantly engages the rifling) straightens it. It does. I did not say that it makes it straight. I guess that I should have said significantly reduces its crookedness. In my test the TIR was reduced to .0015. Shootng is a tunnel, Lou can see truths with a clarity that may get lost in conditions, outdoors. The point I was making was that if you chamber rounds that fit my previously described parameters, that the as fired misalignment is very likely much less than it was before it was chambered. For instance, if Mr. Boyer (referring to what he wrote in his excellent book) had chambered and then unchambered some of the rounds that he shot that lead him to the conclusion that runout did not matter, he might have seen that he was actually shooting rounds that were a lot straighter than he thought. Also it may be that he if was jumping bullets, the results may have been different. I have not confirmed this, because that is not how I seat bullets.
Recently, due to a few changes that I have gotten lucky with, my rifle has been doing some of its best work ever, in spite of the operator. Perhaps I should take this opportunity to revisit some earlier experiments, particularly, in this case, because I have gone to neck clearances that are as much as double what I was running before. Perhaps I will get out that virtually unused half sleeve seater and take it and my turret Harrell's to the range, with my H& H concentricity gauge, and bend some more rounds. I have to do this because for the life of me, my current equipment will not make ammo that is crooked enough for such a test. It is not perfect, but it would seem that the target does not know that.
Boyd
I think that I said that chambering a crooked round (thin turned neck, bullet with pressure ring, approx. .00015 clearance in chamber or less, loaded to a length that significantly engages the rifling) straightens it. It does. I did not say that it makes it straight. I guess that I should have said significantly reduces its crookedness. In my test the TIR was reduced to .0015. Shootng is a tunnel, Lou can see truths with a clarity that may get lost in conditions, outdoors. The point I was making was that if you chamber rounds that fit my previously described parameters, that the as fired misalignment is very likely much less than it was before it was chambered. For instance, if Mr. Boyer (referring to what he wrote in his excellent book) had chambered and then unchambered some of the rounds that he shot that lead him to the conclusion that runout did not matter, he might have seen that he was actually shooting rounds that were a lot straighter than he thought. Also it may be that he if was jumping bullets, the results may have been different. I have not confirmed this, because that is not how I seat bullets.
Recently, due to a few changes that I have gotten lucky with, my rifle has been doing some of its best work ever, in spite of the operator. Perhaps I should take this opportunity to revisit some earlier experiments, particularly, in this case, because I have gone to neck clearances that are as much as double what I was running before. Perhaps I will get out that virtually unused half sleeve seater and take it and my turret Harrell's to the range, with my H& H concentricity gauge, and bend some more rounds. I have to do this because for the life of me, my current equipment will not make ammo that is crooked enough for such a test. It is not perfect, but it would seem that the target does not know that.
Boyd
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