sorting brass and bullet data for best accurac

[offgridkid]

Ok, no sled it is. . .I will report back on my own findings.

On another note, i posted this at another site and was wondering what you all thought on this:

I am having trouble with the whole "case weight" thing, for example, case #17 in my most recent batch has a weight of 170.40 grains and a volume of 45.46 grains (99% iso alcohol) and case #5 has a weight of 172.88 grains and a case volume of 45.22, less than case #17.

I turned the necks on both so there should be no expansion diffs or tension issues wrt the bullet, so why would weight even come into play? isn't the whole purpose to make sure that pressure is constant and that would be more a function of volume than weight in my opinion. Now, all else being the same, I would imagine that a heavier case would have, on average, thicker body walls and that might influence expansion and therefore pressure in the case.

am I missing the obvious. . . .would not be the first time :-[

 

[Larryh128]

The big thing with a lead sled is that it really needs to be able to move under recoil. If it's tied down too much by weight, then the rifle is going to "jump" at the muzzle more than normal. It will absolutely effect groups. I use a lead sled quite often on my mags especially to keep any trigger jerking out of the equation, BUT I don't use any weight on it & it moves under recoil. The sled weighs 18-20 pound so that weight alone really will tame a hard kicker. Using this method, I don't see any difference in point of impact between sled or no sled as long as I'm not tweeking the trigger.

 

[Leaddog]

Coverdog- I've heard of folks weighing primers, but is there any data to support the concept?

 

[Bart B.]

For folks weighing primers, how do you separate the weight of the cup, seal and anvil from the priming compound?

Best 600 yard grouping I know of happened back in 1971. WCC58 unprepped full length sized Western match cases full of 42 grains of IMR4064 under Lapua 185-gr. FMJRB .3092" match bullets shot in a SAAMI spec chambered Hart 1:11 twist Hart barrel screwed into a pre-'64 Model 70 action conventionally epoxy bedded in a wood stock. Rifle was clamped in a machine rest and held much the same way people do with one hand gripping the fore end and the butt locked into their shoulder. Bullets had been spin tested for perfect balance.

Several 10-shot groups were fired and ranged from about 1.5 inches down to under 0.7 inch. One of them about 9/10ths inch was pictured in a late '71 issue of American Rifleman with a Lapua bullet advertisement. Later that morning, 40 shots of the same ammo and rifle were fired into 1.92 inch at 600 yards.

 

[gatorman]

All the talk of sorting brass and primers,etc....I tried this for a long time and logged loads of information..
plus talkedto several top dogs at the 1000 yard in Pennsylvania...I found out most of it was a waste of time.
Most shooter throw the powder charge as well....The only things I do now,it to weight the powder charge
and bullets..My main thing for shooting is a good sight picture and consistent hold on the rifle and trigger
squeeze....All that other stuff is a waste of my shootin time...And thats all I got to say about that...Go
shoot-shoot-shoot