I have designed a rim thickness gauge utilizing a digital indicator.
Would there be much interest in these if I made a batch?
yep, pics please
yes thanks i would be in for 2 of them
Measuring the rim can help with cheap ammo but with match ammo it’s a waste of time.
What would help shooters is something that is about 3/4 of a chamber long you put the bullet into and measure what is left sticking out. The reason is most lots vary in length and if you can workout what length your barrel likes it can cut down on the amount of testing you need to do.
RBA HoF #1 (2007)
Great feedback, I will try and come up with a design that will do both.
I second Peter's info.
If you succeed to built such a device, I'm in!
Congratulations on your win, you are now in a small but very elite club.
Thank you Peter!
Would that measure the over length of the bullet
If that so then you would have to make sure all the rims are all the same thickness
what I think we need to know, is the distance from under the case rim , to the beginning of the first drive band
That may mean removing the wax in that area .
I’m not worried about the rims only the length. This is not new Calfee found the same thing a few years back and tried to talk Eley into printing that length on the box.
If I find a good lot for a barrel I might take one round out of 10 boxes measure them and take an average, they are not all the same. When I need to go testing I’ll measure the test lots and because I keep a lot of data on each barrel I know which barrel to start testing that lot in and it saves time and cash.
Peter are you measuring from the head of the case to the tip of the projectile Or from under the
case rim to the first drive band
That will give you a idea of how deep the projectile is going into the lands
I’m just putting the bullet into the chamber size hole and measuring what is left sticking out, so that would be from the driving band to the end of the case. You can measure it anyway you want I played with it and that’s what I settled on and for me it works.
With good bullets one does not get much rim thickness variation .I know ,
But if it does you will get a different reading your way.
The distance I think we need to know is where the rim touches the end of the barrel to the first drive band
on the projectile and that can vary, Just thinking peter
I have been measuring bullets for allmost 3 years. As Peter Armstrong is suggesting. I use a 1 1/100 of a millimetre dial gauge when measuring, I’ve been useing Lapua ammunition for about the same period, and quite frankly I don’t know why I bother to measure. What concerns me is the wax that accumulates on the case with the gadget I use, after haveing measured a box of ammo, does the wax affect the grip between the case and the chamber wall? not only that, but I was getting so much wax on my screwed up old fingers, that I was dropping bullets when loading. I used Midas + for the 2017-18 TRA Nationals with only enough plus some from David Keen for that shoot, ( thanks Dave ) I didn’t have enough to measure so just shot them out of the box. For me measuring bullets is questionable if useing good quality Ammo. Kind regards, Roy Helbig.
Name Pts Sh 1 D Kerr 189. 3 2 M Tallar 99. 2 3 M Huebner 95. 2 4 R Marshall 83. 2 5 C Whittleton 81. 3 6 S Sori 80. 2 7 B Atkinson 79. 2 8 D Parsons 77. 2 9 E Parsons 73. 210 D McKillop 65. 2
Name Pts Sh 1 B Wilson 113. 2 2 B Simmons 106. 2 3 R Cox 106. 2 4 B Jupp 102. 2 5 N Bardell 100. 2 6 R Powell 100. 2 7 N Digweed 98. 2 8 P Sullivan 94. 2 9 M Cole 92. 210 B Mitchell 89. 2