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Where to start seating A-Max and SMK?

 
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  #8  
Old 09-22-2010, 07:30 PM
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Re: Where to start seating A-Max and SMK?

What do you guys start with as a normal seating depth when you are trying to work up a new load. Do most of you start at the lands and work back or do you start with a certain jump measurement and work around that to tune. I have only been reloading for about 6 months and this is one of the things that I ponder over. Thanks Jason
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Old 09-22-2010, 07:44 PM
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Re: Where to start seating A-Max and SMK?

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Originally Posted by jrw1976 View Post
What do you guys start with as a normal seating depth when you are trying to work up a new load. Do most of you start at the lands and work back or do you start with a certain jump measurement and work around that to tune. I have only been reloading for about 6 months and this is one of the things that I ponder over. Thanks Jason
There is some good starting info in the above posts. VLD's near or into lands and tangent ogives (spitzers) about .020" off. Some folks have had some luck seating the VLD's quite a ways off the lands and not paying too much attention to the 100 yd. groups but checking the accuracy at longer ranges. TEST TEST TEST! That's why we have lots of good barrel makers....Rich
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  #10  
Old 09-22-2010, 07:48 PM
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Re: Where to start seating A-Max and SMK?

I pick a moderate load(nothing extreme) and adjust to determine best seating first.
Then go to powder adjustments.

I know of no reason that seating rules of thumb would hold from one gun to another(unless the same reamer was used). Seemingly forever shooters declared jammed as best for VLDs, -until Berger debunked this. Now people aren't so afraid of 'evil' VLDs.
But if you WANT your seating at some particular value, you can of course tweak powders to get the best THAT seating will produce for you.
I suspect this is most common...

My opposite approach on this is based on experience with one gun long ago. And it's worked with every other since.
One powder optimum seating point, held for another powder, and another. Even though velocities and performance(tune) were completely different between them, best seating point still held as best -for that chamber.
So I strongly feel that seating is not a tuning tweak at all, but a prerequisite to potential performance.

Last edited by Mikecr; 09-23-2010 at 09:43 AM.
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  #11  
Old 09-23-2010, 12:07 PM
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Re: Where to start seating A-Max and SMK?

If you want a rifle that can feed from the magazine then I'd start there. You would be surprised at just how many rifles shoot good groups at .100"-.200"-.300" off the rifling. I have a custom .308 that I was working up loads for. I really don't care about feeding from the magazine but just for the heck of it I loaded some 165gr Accubonds to fit in the magazine. They were .125" off the rifling. To my surprise it was the most accurate load for that bullet in that particular rifle. A-Max bullets hated it that far off but the Accubond was at its best at a full 1/8" off the rifling. Go figure.
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  #12  
Old 09-23-2010, 03:15 PM
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Re: Where to start seating A-Max and SMK?

Yes, the forgiving tangental ogives like the AB or SMK can often work surprisingly far off the lands. But in my experience, rarely do secant ogives like A-max's and Bergers shoot good groups jumping very far at all, and the VLD's shoot best more often than not around 10 to 15 thou into the lands. This is at 100 yards anyway, but as Elkaholic and others have said, the VLD's may shoot ok further out even if not too flash at 100 yards. Its just much easier doing your initial load development at 100 yards, then going back to 600 and 1000 yards to confirm what you're seeing at 100. Occasionally you'll get a load that performs good at 100 that looses it further out and vice versa, but this is the exception. Usually a load that groups great at 100 yards with a low ES will work great at long range.
Greg
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  #13  
Old 09-23-2010, 04:11 PM
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Re: Where to start seating A-Max and SMK?

Quote:
Originally Posted by Varmint Hunter View Post
If you want a rifle that can feed from the magazine then I'd start there. You would be surprised at just how many rifles shoot good groups at .100"-.200"-.300" off the rifling. I have a custom .308 that I was working up loads for. I really don't care about feeding from the magazine but just for the heck of it I loaded some 165gr Accubonds to fit in the magazine. They were .125" off the rifling. To my surprise it was the most accurate load for that bullet in that particular rifle. A-Max bullets hated it that far off but the Accubond was at its best at a full 1/8" off the rifling. Go figure.
Again, this is an example of tangent vs. secant ogive. The secant (more often than not) likes to be close or into the lands.......Rich
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  #14  
Old 09-23-2010, 05:46 PM
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Re: Where to start seating A-Max and SMK?

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Originally Posted by elkaholic View Post
Again, this is an example of tangent vs. secant ogive. The secant (more often than not) likes to be close or into the lands.......Rich
Can you provide a basis for this? A logical reason?
I wonder, because I've never seen one.

Why does ANY bullet 'like' one seating over another, in a particular chamber?
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