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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/07/2011 at 20:42
JF4545 View Drop Down
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Guys,
Ive still got lots to learn about reloading. I bought 2 OAL Guages today plus the Brass that screws onto them. These are Hornady Guages and 1 is Rounded for Autos, Pumps and Levers. The other a staight Guage for Single Shots and Bolts. It really makes the process alot easier..
   So now if someone would just tell me how far to keep the bullets off of the lands that would be very helpful.. Where do I start on a 7mm-08 or a 270wsm?                                              Is the starting point always the same? 
How FAR can I go?
Thanks Alot in Advance!!!
Any other reloading tips you may have? I would be grateful?
 
J..........


Edited by JF4545 - August/08/2011 at 17:58
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/07/2011 at 21:19
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Pretty much I am just getting in here to learn more myself... But  in theory, the over-all length of the round is dictated only by the where the lands are in the rifle. And if the bullet is still in the cartridge. I usually start at the o.a.l. listed in the books, and then work out.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/07/2011 at 23:06
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A case length gauge just measures bullet seating depth and possibly trim length of the case. I don't know for sure, not having one.

Anyway, seating depth is what's important here. That is individual to your rifle's chamber and the bullet you use. Its easy to measure. Mark a loaded cartridge with a sharpie and experiment with seating depth to see when the lands leave a mark on your loaded bullet. Using a cleaning rod you can measure the jump to the lands of a loaded round. Some rifles like a jump, some like the bullet jammed into the lands, others in between.

Don't over-think reloading. Get the equipment and put a few dozen reloads on paper. The process will unravel more easily that way.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2011 at 07:26
jonoMT View Drop Down
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Three things to keep in mind regarding seating length:

  1. Tangent ogive bullets are less sensitive to seating depths than secant ogive bullets. In other words, it isn't necessary like it can be with a secant ogive.
  2. Your rifle's chamber may be so long-throated that you either can't reach the lands because the bullet won't have enough seating depth to stay in the cartridge or even if it does it won't fit in a magazine or feed easily
  3. Seating depth will affect pressure. Proceed with caution and consider ladder tests changing only one variable at a time, such as powder amount or seating depth.
I just load to OAL and focus on other reloading issues, such as making sure necks are safely set back so that they don't exceed the proper length. That's where a case-length gauge is an essential tool, along with a high-quality caliper.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2011 at 12:06
JF4545 View Drop Down
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Originally posted by jonoMT jonoMT wrote:

Three things to keep in mind regarding seating length:

  1. Tangent ogive bullets are less sensitive to seating depths than secant ogive bullets. In other words, it isn't necessary like it can be with a secant ogive.
  2. Your rifle's chamber may be so long-throated that you either can't reach the lands because the bullet won't have enough seating depth to stay in the cartridge or even if it does it won't fit in a magazine or feed easily
  3. Seating depth will affect pressure. Proceed with caution and consider ladder tests changing only one variable at a time, such as powder amount or seating depth.
I just load to OAL and focus on other reloading issues, such as making sure necks are safely set back so that they don't exceed the proper length. That's where a case-length gauge is an essential tool, along with a high-quality caliper.
 
Hi Jon, Nice to hear from you!
As I said I have much to learn. OAL on my 7-08 is 2.800 and Im loading 140gr. Accubonds, is the AB a Tangent ogive bullet?   Im wanting a 1" group or under and Im awfully close if I keep it to no more than 3 shots....
  


Edited by JF4545 - August/08/2011 at 17:56
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2011 at 15:39
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If you blew the primer, you had way too much pressure. I think seating the bullet out to touch the rifling will raise the pressure. That isn't the thing to do for hunting rifles. Barnes recommends a .050 thousands bullet "jump" for their bullets.Bucky
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2011 at 17:28
jonoMT View Drop Down
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The AB is a tangent ogive. So the nominal OAL of 2.8 is just fine. It's one less thing to mess around with and keeps your cartridges usable in the magazine. As long as you're using decent brass (and if I recall, you got some Lapua) and good primers then you can minimize load development to a couple powders and do ladder tests with loads in increments of .3 grains. Read up on Jason Baney's ladder test article: http://www.6mmbr.com/laddertest.html

You don't have to go to 1000 yards to apply it. I've found it works well @ 300 too. One improvement you can make regarding the section entitled "Managing Test Targets" is to get a package of different colored Sharpies. (Don't go with Bic, they're crap and I had to iron the target flat to see the colors). I found it really adds to consistency if you can just keep the same point of aim on one target and cycle through all your rounds, e.g. 39.0, 39.3, 39.6, 39.9, 40.2, 40.5...39.0, 39.3, 39.6, 39.9, 40.2, 40.5
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/08/2011 at 17:54
JF4545 View Drop Down
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Thanks Jon!  I will read thruogh this a couple of times, then send you a PM so we can discuss it some. I  should have just asked you this directly to begin with. Someday I will remember.....

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