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Bullet runout

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sakomato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sakomato Quote  Post ReplyReply Direct Link To This Post Posted: May/28/2009 at 18:59
Hey Texas
 
I got the Bersin from Kinneman's but that website is no longer available.  Perhaps if you did a search for the Bersin you can find one.  It was not cheap, about $300.00 if I remember.
 
Hornady is coming out with a new concentricity gauge where you can push on the bullet soon
 
actually it looks like the tip of the bullet and the case head are held in place and you push on the neck.  Either with the Bersin pushing on the bullet or the Hornady pushing on the neck is going to have the possibility of canting the bullet in the neck.  The Hornady may be better in that when you push on the neck you are actually aligning the tip of the bullet in line with the case body rather than aligning a point on the ogive in line with the case body.
 
It is far better to purchase good cases, not create runout when resizing the neck (by whatever method you choose) and seat the bullet straight with minimal force.
 
Originally posted by Texas Texas wrote:

By the way, I have an SG&Y Rifles (Speedy Gonzales) custom 280AI that shoots lights out. How do you find yours?
 
Mine is a rebarrel of a Sako 75 action, from 270 to 280AI, done by Hart 1 in 8.5 twist and it is a good shooter but develops do-nuts big time with Nosler 280AI brass.  It is my "pivot" rifle in that if I am going Whitetail I'll carry the 280AI and my 6.5 rem mag or if I'm going Elk hunting it is the 280AI and the 338RUM.  It is stainless so I always have an option for a rainy day.
 
Hey JB, did you drill your holes in your wood on your bench to go over only the bullet or go over the case neck?
Guns only have 2 enemies, rust and politicians
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Texas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Texas Quote  Post ReplyReply Direct Link To This Post Posted: June/01/2009 at 14:30
Sakomato, you are the second to tell me about that new Hornady rig. I think I will get one when they are available, the Bersin set up doesn't seem to be around.
 
My 280AI is built on a Rem 700 action blueprinted and trued with a Shilen Select Match SS #5 taper barrel pillar bedded in a black Mickey Rem Classic stock. My all-time favorite whitetail rig - although I'm flirting with 338 WinMags these days of hunting horns and any shot I get thang...
 
Texas
"There are some things which cannot be learned quickly and time, which is all we have, must be paid heavily for their acquiring. They are the very simplest things..." Ernest Hemingway
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John Barsness View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Barsness Quote  Post ReplyReply Direct Link To This Post Posted: June/01/2009 at 19:34

One thing I am personaly convinced of, after fooling with this for a while, is that heavier bullets tend to straighten out in the rifling ahead of the throat after being fired, evfen if they're seated slightly crooked (emphasis on "slightly"). This is particularly true if the bearing surface of the bullet is fairly long.

Bullet "hardness" might also have something to do with it. A monometal hunting bullet certainly would have a tendency to follow the bore, partly because it doesn't have a thin jacket and soft lead core, and partly because it would be longer for it's weight. This would help explain why the Barnes TSX and other monometals shoot so well in many rifles. 
 
Of course, heavier bullets that aren't too long to be fully stabilized in the barrel's twist also might shoot better because they match the twist closely. But I am pretty certain that both factors are at work.
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sakomato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sakomato Quote  Post ReplyReply Direct Link To This Post Posted: June/01/2009 at 20:32
Hmmmmm, heavier bullets....Ditto
 
I have seen what you are talking about with accuracy happening with the heaviest possible bullet before the twist looses it's grip.  I had a Sauer lighweight 30-06 that I absolutely loved but I tried every bullet and powder combination
 
165 gr - Partitions, TBBC, TSX, Ballistic Tips, NorthForks
168 gr - TSX
175 gr - Sierra MK
180 gr - Partitions, TSX, Failsafes, Ballistic Tips, Sierra Game Kings
 
all with every powder from IMR4350 to RL22 and was not satisfied until I tried the 200 gr Accubond and RL22.  Now it would not shoot the 200 gr TSX and would keyhole with that bullet which was too long but it was 100% consistant with MOA with the 200 gr Accubond and 60 gr RL22 and Fed215's.  So the 200 gr AB was right on the verge of being too long for the 1 in 10 twist but gives excellent accuracy.  Matter of fact I have yet to see any of the 30-06's I reload for (8) fail to shoot that load.
 
Perhaps the slower powders used for the heavier bullets contribute by slowing down the force behind the bullet rather than slapping it out of the barrel.
 
Who knows but I am definitely a member of the Heavy Bullet Mafia!
Guns only have 2 enemies, rust and politicians
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