Originally Posted by MikeS
At the end of the day I like to decide what matters for me based on my own results.

1000 yards prone/sling/irons groups

.284 Win, 184 Bergers SD 5.4 FPS Vertical 6.56"

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.308 Win 155 Bergers SD 13.1FPS Vertical 16.37"

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This group has double the shots of the first, but you can clearly see the elevation differences corresponding different velocities shown on the right.

The "positive compensation" effect mentioned in other posts above is not to be discounted, but I'm not certain it can be relied upon over different conditions.
Mike i agree 100% if I wanna change something I tezt it myself, I consider myself lucky I can lean on a very successful 1,000 BR shooter if have a gun that isn't were I want it all I have to do is text him a pic of my targets and he gives me suggestions after we text or talk about it.
I've also shot with him for a couple years alot when he does his testing which is usually Jan and Feb in Montana winters which aren't very pleasant we always set are targets up and everything ready and are shooting as soon as we can see. He would shoot at 890 and me at 700.
One mourning I watched him test 3 different firing control systems different bolts with different weight springs and pin dia. in his BAT action Light Gun, pretty eye opening at the rests. How many do that? or even measure pinfall, protrusion or change springs? My guess is not many.
I know some dont even own an annealer, couldnt tell you there runout because they don't measure it, use mandrels to open up necks because they don't want to disturb the carbon inside the neck its there lube albeit you have to turn necks for that or clean case only the outside they wipe it down with alcohol to get all the case lube off. Grip on bullet is another big one and only using inline dies to " feel" the seating force you can never do that with the " Competition " seater.
I'm not to the point yet were I use a force pack but if I feel any difference in seating a bullet the round comes apart and I start over. Everything I just mentioned was basically taught me by some really good 1,000 BR shooters because I asked questions and saw the results for myself on target not because some article, computer or number said otherwise.
People can believe this stuff or not it really doesn't matter to me but some just wanna attack you because some 9,10 20 year old article says different.