After you shoot with new brass, neck size and decap, can you load it the same as originally and expect similar results? Or does this change the pressure?

I have about 25 new Winchester brass left then I'll start reloading the once fired Winchester and Remington. I'll test some loads with the Remington to make sure I'm okay with pressure and all but as far as the Winchester, can I load it the same as I did before? I'm talking about a .25-06 just in case it makes a difference.

Theoreticaly I think you could notice a difference between once fired neck sized and the original never been fired. I have done this in hunting application and still gotten acceptable groups, benchrest guys may disagree.

matt

No matter what brass is used I wouldn't skip trimming the case to spec length if necessary.
I haven't seen any indications that using twice fired or more brass changes the pressure significantly.

My rifles shoot more consistently using brass that's been fired formed in each specific rifle.

Yeah. It's been fire formed in my gun. Was just wondering if I need to be carefull with pressure differences. And I do plan to trim the cases after neck sizing.

It all depends on your rifle, some have tight chambers while others allow for more expansion of the brass. The fireformed brass if anything will have slightly larger dimensions resulting in slightly larger case volume. You might notice a reductin in velocity but it probally will be less than the standard variation between shots.

I would expect there to be more of a difference in case volume between different manufactures of Brass than you will find with the new and fireformed brass.

Case trimming check legnth, often times it is not required between loadngs. Good practice it to trim to uniform then check for case legnth. Case legnth is much more critical in pistol rounds that headspace off the case mouth than bottle neck rifle rounds

I always run new brass thru a decapper/sizer die just deep enough to make sure the case mouth is perfectly concentric and the correct size....aka known as "neck sizing". Then a few strokes with a hand held case mouth deburring tool for inside case mouth smoothness. But then this is the same exact proceedure I do for all my fired brass too each time after they have been fired, and measured to see if I need to trim the brass to length.
I only Full Length resize all brass to be used actually hunting so I don't get a stuck case in the chamber while in the field BTDT and a REAL PIA.

What ammo I shoot in the field, especially where I am going to be sneakin' & peekin' still hunting, is usually my oldest or most worn brass...so if I drop one and loose it, it's no big loss & so what. Historically 90+% of my game shots are under 150- 200 yards and what I hunt with will group out of a cold barrel dead nutz where I put the scope Period at least "one more time" or it doan't go huntin'
Ron