Headspace plays a huge factor in velocity. But what’s practical accuracy? And does velocity deviation really matter?
This is a VR to Tim R. @ PC Bullet Empire video HERE
Innovation in the Arcane Art of Reloading… Lets gather ideas, thoughts and join my journey with me to find that accurate load in both precision long range and cast lead shooting.
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What Hornady comparator bushing are you using to measure headspace. The reason I ask is because I load huge volumes of 6.5 CM and my case measurements of a fired case are around 1.539 +/- .001. I use the .400 bushing because SAAMI shows it’s drawing measurements at .400″ on the neck. So please explain! Also, as a serious handloader, I only neck size bolt action brass and bump the shoulder back .002″ to allow for bolt closing without resistance. My bolt action loads have ES averaging 9.0 and SD’s at around 5. I also neck turn all brass after… Read more »
Hey Mike. The Hornady cooperators are kinda generic to accommodate multiple cartridges so the 400 comparator doesn’t exactly read from the Datum line. I just use the 400 as a reference from fire formed brass. I’m doing things a lil different. I full length bump size with a headspace that’s about 1 to 1.5 thousandths over my chamber. Annealed everytime after firing. I let the bolt do the final sizing. Neck turned to allow the bullet to fall into the case with very slight resistance on fired cases
Just trying to show support over here as well as over “there” 😉 I learn so much from watching you. Have you used the Mica dry lube that Midway sells?
Has it been your experience that similar weight cases from the same manufacturer have similar water volume (as determined by weight change empty to full)? In other words, with Starline for instance, might one select groups of cases entirely by weight of processed brass (shoulder bumped and trimmed) for acceptable or better accuracy out to say 500 yds?
Actually I noticed that after fire forming and measuring volume on cases that weight near the same the volume also was the same for quality brass like peterson, starline, lapua. The others that weight more or less also had the same volume Also the rounds that produced flyers I separated and found those cases having high deviation in case volume. I think thats also a good method to weedout without measuring volume. If your shooting to 500yds the benefits of volume sorting really wont show much so I wouldn’t sweat doing so
As I said on the “other place”, this is definitely a “keeper” video. Good info well presented. Thanks!
Thanks brother! Hey anymore adventures anytime soon? Your articles always intrigue me
super video. really nice handwriting. lol how do you like that mec press? I am just starting to load 6.5 Grendel but first I am redoing my bench. (big project.) again really like the vid. very informative.
I thought my handwriting was barely legible haha. The Grendel is definitely a really cool cartridge. I hope to get one. Let us know how this goes!
after watching the video I went and bought one f those powder funnels. so you did have an impact. lol
my bad o0n the press. it’s a forester and how do you like it compared to the others? I have an old ( really old ) redding single stage and am thinking of getting a newer single stage.
Wow very interesting video, a question can neck turn also happen with pistol brass? When you say neck turn what do you specifically mean?
Hey Mario! Since bottle necked cartridges are swedged and formed (almost all cases in fact) the drawing process leaves differences in thicknesses on the neck area. These different thicknesses release the bullet at different pressures. Neck turning helps uniform this. Its mostly aimed towards precision long range when shot for shot velocities are needing to be the same. I wouldnt sweat getting into it unless your needing to shoot super tight groups or 1K. Also there isnt a need or ability to turn down straight walled cartridges so your good there for pistols
Good stuff Mr. Eye… I think I know what neck turning is.
Haha Im still figuring it out aswell. But no worries ill never mislead anyone. Lots of research and learning behind the scenes…. i guess my obsession gets the best of me sometimes lol
Outstanding Kenny…just friggin outstanding!
Hey Charlie! Thank you sir! I appreciate the folks siting through this one… it was lengthy lol
Might have been lengthy but it was worth the time and then some! I didn’t notice the time actually…I was engrossed.
Excellent video and extremely informative. That is some really great information. I cannot wait to try to put this information to use and see what I can do with it. Thanks again for taking the time and putting this out there.
Much appreciate that brother! I tried to get this article out before it uploaded to YT. Thank-you for commenting on here. I know with all your hard work on that Valkyrie is gonna pay off and it’s helping many of us
Many thanks. I hope that some one is getting something out of it. At the very least you’ll know what to do.. Lol..