Concentricity gage?

[Mikecr]

Whoa, throwin a BS Flag here...
Magnum, are you seriously suggesting that use of redding dies alone will produce TIR <.001" in loaded rounds?
What the hell are you measuring with?


Also to the original poster, are we talking about RCBS or Redding concentricity gages?
all I see from Redding is for thickness variance, not concentricity.

 

[boomtube]

Sorta agree with Mike> No seater, taken alone, can overcome bent necks. Of course a bad seater can defeat straight necks so it's a matter of sizing so the necks remain straight and then seating bullets straight into those necks.

Again, neither a good sizer nor seater die, by itself, can do it. And bad loading technique can defeat the best of dies, press and brass.

 

[KQguy]

Whoa, throwin a BS Flag here...
Magnum, are you seriously suggesting that use of redding dies alone will produce TIR <.001" in loaded rounds?
What the hell are you measuring with?


Also to the original poster, are we talking about RCBS or Redding concentricity gages?
all I see from Redding is for thickness variance, not concentricity.

I was on the Midway UAS site,and they show a Redding concentricity gage(item#311160),it could be a misprint though.Thanks for bringing it to my attention though,I will look into it before I buy one.
KQguy

 

[ss7mm]

MidwayUSA - Redding Case Neck Concentricity Gage
caseneckgauge.html

This is what they show. It's for neck thickness etc.

 

[KQguy]

If that's not what I am looking for,should I get an RCBS?

 

[ss7mm]

The RCBS is shown above and you can see a Sinclair model here. Welcome to Sinclair International's Online Store

There are others but this gives you an idea of what they are and what they do.

 

[KQguy]

The RCBS is shown above and you can see a Sinclair model here. Welcome to Sinclair International's Online Store

There are others but this gives you an idea of what they are and what they do.

Thanks for all the help!I wish I found this forum a long time ago,it would have saved me alot of time and money from learning the things the hard way.

 

[ss7mm]

Yes, you have received a lot of info from a lot of people on LRH, as do the rest of us, but remember that all of us that can now supply info also had to find it somewhere the first time when we didn't know about it and somebody probably helped us out then.

Pay it forward works for me.

 

[Slopeshunter]

I'll say thanks to all also, I learned alot from this thread.

Cheers!

Yes, you have received a lot of info from a lot of people on long range hunting, as do the rest of us, but remember that all of us that can now supply info also had to find it somewhere the first time when we didn't know about it and somebody probably helped us out then.

Pay it forward works for me.

 

[paphil]

This is an old thread but one that is pretty important and after spending an entire week playing with a concentricity guage, I decided to add my two cents. I just got a new toy, a 7MM best of the west rifle with a stiler action. I bought 150 pieces of new brass and set out loading up the best , most accurate load possible. Question. Does new brass need resized prior to loading? It is so undersize that sizing it is a waste of time. First shot with new brass will fire form it to fit exactly in your chamber. Now check case length and trim to correct length. Some pieces had streached .025 and were .015 too long! All case necks were nearly perfectly round and concentric after firing and after resizing. Problem was most of the loaded bullets necks were within .002 but the bullets were .006 to .008 out of round . When checked close to the neck and out near the tip, the rounout was nearly the same. The bullets were straight and the problem was the thickness of the case wall not being even. The solution that I used for these was to mark the high side and place the cartriges in the gun with the mark up. This alone cut groups in half. After firing, I turned the necks to get the thickness the same all the way around. After resizing and firing again the bullets lined up much better and group size was down to 5/8 inch at 200 yards.Sometimes that little extra cost for better brass would save time and money in the long run. Cheap brass, especially specials on brass should be avoided or at least measured before purchasing.
The idea of pushing the bullet back to straight will only work if the bullet is crooked. Measure close to neck and near the tip, if they are close to the same ,check wall thickness. The little things do make a difference!