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Seating Berger VLD Bullets

 
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Old 10-20-2012, 09:36 AM
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Re: Seating Berger VLD Bullets

Correct advise above.

1. The time to worry about COAL from tip of bullet to bottom of brass is to fit your magazine.
2. For optimum uniformity, weigh every bullet and measure every bullet from base to ogive and sort accordingly. Personally, I get lazy and don't do this as much.
3. Sort brass by weight.
4. neck turn all brass.

The 4 items above are to tighten uniformity.

The other thing to remember is that you need a seating stem cup that is for a VLD style bullet as mentioned previously.

Finally, the ogive is not a single point on the bullet but a short distance measured on the bullet surface where all of that part of the ogive may contact the lands depending on how your rifling was cut by the reamer. So, even if you sort bullets by length from base to ogive, it may or may not make a difference as to accuracy and precision. So I only sort bullets by length if I have time and I'm not feeling lazy. I have found that in my hunting world and distances under 600 yards, it has made very little difference.

So even if you have 2 loaded cartridges where the COAL is even 0.015 difference but the OAL from ogive to brass bottom is 0.010 or less, this doesn't necessarily mean that they will shoot differently. I'd much rather have loaded ammo that is concentric on a concentricity gauge with a couple thousandths difference in length (with respect to ogive) as compared to exact same seating depth but concentricity is over 0.002-0.003.




You can see here the rifling marks. They are not a single exact point but a short flat length. So even though the overall initial rifling contact may be a spread of up to, say, 0.004 or 0.005 thousandths, if you are seating bullets and are still w/i that range when measuring to ogive, you should be ok.



I use the Sinclair concentricity gauge. This little tool will tell you how well your finished rounds really are:




clear as mud?
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