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Powder compacting when seating bullets.

spife7980
You compact it enough and it won’t compact anymore and you can’t hit your proper lengths. Actually start crushing powder and you make more sirface area which makes it burn faster.
Also, sometimes it can push the bullet back out a bit depending on your neck tension.
Nothing inherently bad by compaction on its own.
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Geissele Cut Rifled SPR Build and Barrel Evaluation. (Part 4 (Load Development 28MAY25) Update!!!

Bigjake83
PrimoLuvr said:
Do you have any observations on brass re-sizing for this Geissele chamber vs a CLE?
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No.... fire some ammo through it that has the brass you plan to run, then set your FL Die to bump the shoulder .003

This should honestly be your procedure for any PRECISION Gan Gun.

Also make sure to check neck tenion, if it's too loose the projectiles will slide forward jamming into the lands.

I do this by making some dummy rounds with the resized brass and chambering them with the bolt release a few times to make sure nothing has changed your COAL.
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Why do people load so hot?

diggler1833
bax said:
yeah, okay but I'm not doing case volumes with water for 20 cases so I can make a comment on this board. AND, I would have to put primers into the Lapua which I don't want to do. If I did it right, I would make sure they were all trimmed to the same length - wot I am not doing either :) Funny thing, the Lake City was just annealed and sized so the outside dimensions are essentially identical. I can't say the same for the Lapua. When you start to think about comparisons things get complicated pretty fast. Same thing I said earlier about pressures.
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Why not collect the rest of, and more relevant data? That's like punching your load into your powder thrower and not measuring the result.

I don't do it to "make comments", I do it so I know what I'm working with.

Or, just don't measure anything and keep on keeping on. You do you.
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Powder compacting when seating bullets.

david walter
I have two ARs in 300 HAM'R.

I've been loading up a few hundred 125 TNT with CFEBLK to fireform Starline cases for further reloading with the 130 Hot Cor. The fireforming adds a bit more room for powder.

Lots of comments on the Texas Hunting Forum 300 HAM'R thread about using drop tubes to get more powder in the cases without compacting the powder when seating the bullet.

What's the disadvantage of compacting while seating? Less uniform density in the powder column? Or is it something else.

Or is there really no disadvantage to compacting while seating?
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