I’m not a top shooter by any means and your mind is probably made up so don’t flame me ! but I’ll try,
firstly from what I’ve experienced consentricity is down the list of things that affect accuracy at least in my testing.
Second I use a press that is older than my kids but do enjoy semi custom dies over fighting the process.
Thirdly when developing loads I just follow what the target tells me and what the say is hot loads don’t necessarily repeat
Fourthly, who’s McMillan? Maybe the guy that beat him was full length sizing hell I don’t know.
Yeah Barrels cost money but you can win them at events if your willing to FL size.
No flaming on the first part.
I would not say concentricity is down the list. Bullet runout, bullet alignment in the case, FWIW, even full length sizers are HUGE on concentricity. My question is then, why go all through all the steps to get concentricity when the finished product is off in the chamber? Concentricity IS one of the top two concerns when reloading for competition.
That leads us to the second point about custom dies. Some of the top shooters dies aren't really FL sizing dies. They are custom made for MINIMAL separation of the case to the chamber. So, they are barely sizing just a smidge more than what a neck sizer would take down. If that. Often the same reamer is used for the die as the chamber it's just pushed in .002" short. That leaves the shoulder getting bumped back .002". And, since there is very little taper on the 6-Dasher and 6-BRA, there is very little sizing on the case walls.
I also understand that brass has an elasticity that steel does not. It also comes back to original shape and size better. Thus why cases can be extracted more easily. It's also why custom dies have to size them less.If you run brass too hot, no matter what way you size, you're going to have sticky bolt lift. Or, blown primers. I watch guys all the time chasin' the unicorn of hotter and hotter loads. Just find an accurate node that is below pressure problems and you will not have hard to move brass.
After reloading some brass as much as 20 rounds reloaded on it I've not had to FL size. I'm not shooting as fast and may have to call wind that tiny bit better, but I consider that knowing your ballistics. Loading hot eats barrels and destroys brass which leads to inconsistency.
I doubt if any of the guys Speedy asked how they size would take a brand new RCBS, Redding, Lee or Lyman 'off-the-shelf' die if he handed it to them so they could use that for their next match. Those are made for the masses. Again, customs are made to fit with very little brass movement.
Now for the flame. You need to find out who Mac McMillan was. Read up, there is a lot of good information. The guy that beat him, Stinnet, as I understand uses a custom die to FL size.
All target shooters strive for perfect shot placement. Well one man has come closer to perfection than any other shooter who ever lived. You are looking at Michael Stinnett's .
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We reported two weeks ago that Texas shooter Mike Stinnett nailed a .0077 group in competition -- the smallest 5-shot group ever shot at 100 yards. This has now been officially recognized as a new NBRSA record, <a href=http://bulletin.accurateshooter.
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There is a lot more to this than just FL sizing.