Just starting to reload this weekend...

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3 things that reduced my groups by the most.
Case neck inside surface texture.
Do this measure the ID of the neck with your calipers applying steady tension and then spin the case with your fingers while measuring.
Does it feel gritty???
Now take a nylon bore brush in a drill and run it through the case neck while spinning.
Check neck ID again and feel surface texture.. is it smoother?

If you are not brushing case necks there is accuracy to be found if your necks are rough feeling.

VLD chamfer the case mouth.
I use this.
https://ads.midwayusa.com/product/1...MI6q-Hk7X-5gIVCtvACh36DwsmEAQYASABEgKIYfD_BwE

Keeps from peeling the guilding metal from the bullets and much more consistent seating.

And finally the measurement of the case ogive. Talking base of the case to the middle of the shoulder.

If you have more lube on a case than another or if the neck on one case is rougher than another or the alloy or hardness is different after sizing you can have a lot of different ogive measurements.
One reason to keep lot numbers of brass the same and number of firings and annealing of case necks.
 

retrieverman

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I’ve been handloading for my rifles for about 15 years and have taken the minimalist approach.
I use a RCBS Rock Chucker press only for sizing brass and prime with a RCBS hand primer tool. I “measure” powder with Lee dippers and use Lee hand presses for seating bullets and crimping.
My friends who are anal about case prep and powder measurement still can’t figure out how my loads are at least as consistent and accurate (if not more so) as theirs.
 
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I have a load for .243 that is more accurate if I use a lee dipper than if i weigh the powder.
I never figured that one out.
Actually I did. Seems volume is much more important sometimes.
I was at a buddies place and he had a steel plate at 500 yards 18"x18".
I took some loading stuff to his place to make loads for my .308 but no scale.. just a 454 case pinched down to allow 41.5-42 gr of IMR 4064.
I hand cleaned the cases and dipped the load and he never missed the target shooting my .308.
Blew his mind how it could be accurate and not weighed and just hand cleaned cases.
Reloading from the trunk of my car.

Yea I brushed the necks.
 

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