annealing velocity change???

[stvnbrg]

Hi. I have a .223 and previously at 700 with non annealed brass I'm consistently dialing for 21.25 minutes. I annealed my brass this last time and my drop is now 21.75 ! All other variables the same, is this loss of velocity due to annealing??

[Derek M.]

Several factors could contribute, like temperature, a different lot # of primers, powder, etc. One thing I noticed was a drop in velocity going from new brass to once fired in my 280 Remington with Norma brass. I went from 57.5 grains of powder for virgin brass to 57.7 in once fired just to maintain the same velocity.

I do not know honestly but would think annealing would be closer to the bottom of causes for what you are seeing.

[Joe King]

just a change in barometric pressure and humidity can cause that much of a change in trajectory.

[stvnbrg]

Normally I would agree however I have been using , with outstanding accuracy thus far, the Applied Ballistics app from Bryan litz which has inputs for those values and which have never been wrong before. Information on this is tough to find! One theory I found was less neck tension due to softer brass makes for lower pressure and reduced velocity. Thoughts?

[Greyfox]

I have found annealing to tighten velocity spreads, but not effect average velocity to the degree that you describe. But that's just my experience.

[Derek M.]

I have gone back and forth over the years on it mostly depending on time and laziness but I think I'm going back to annealing after every shot just for consistency. I doesn't take long to do it in small batches.

[elkaholic]

The only difference I have seen is lower es/better accuracy (especially vertical).....Rich