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Case fill and burn %
- Thread starter coop2564
- Start date
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Zen Archery
Well-Known Member
- Joined
- Dec 27, 2012
- Messages
- 1,537
What cartridge? Too many variables. Pay attention to loads under 70% fill.
My preference is 90% and up, regardless of cartridge.
I was always taught 90% case fill. I see my best results with 90% or more.
fseaman
Well-Known Member
90% plus on fill. Burn rate to match bullet+cartridge parameters. Book will guide powders.
COAL is also a big deal unless you go by book.
QuickLoad has the tools to indicate %fill and %burn. GRT might as well but I am being slow to learn it over QL for 10 years plus.
I have other tools as well but those are attainable easy enough.
COAL is also a big deal unless you go by book.
QuickLoad has the tools to indicate %fill and %burn. GRT might as well but I am being slow to learn it over QL for 10 years plus.
I have other tools as well but those are attainable easy enough.
waveslayer
Well-Known Member
100% with slight compression if possible, with 100% burn rate depending on barrel length, powder and what pill I'm using
fseaman
Well-Known Member
QL calculates all that.
I prefer %100 but it's not absolute. It's what is accurate.
My personal is that too low a %burn makes it harder to be accurate. "Upsets" the bullet on barrel exit. Lots of slomo video on YouTube shows it. Will the bullet stabilize after "distance"? I think so.
Perfect is not perfect. Preference is confidence.
I recently got GRT but its really off on many of my calibers, like 6.5 Grendel its way off on pressure and velocity for me using TAC and CFE223. My Hornaday book shows max at 31.2 cfe223 using 123 eldm @2500. GRT with all that data plugged in show that is 17k under max and only 2200 on velocity. Some others it shows to be off on fill and burnt % too, compared to my reloader books. so having a hard time thinking its worth spending any time on.
Per my previous response, I prefer >90%, so most strive towards a 100% fill ratio and sometimes beyond.
fseaman
Well-Known Member
GRT is free, isn't it?
An extremely quick and dirty on QuickLoad comes up with that exact FPS on a 6.5 Grendel+123 ELDM and indicates "max".
QL shows same FPS with 28.9 of TAC.
QuickLoad may be a valid investment for you.
Is this 6.5 Grendel one of your rifles? If yes, gas or bolt? Barrel? COAL you intend to use? I can "refine" and find full case full burn.
fseaman
Well-Known Member
BTW: It seems hard to reach %100 burn with the 6.5 Grendel in my quick and dirty model.
High 90s fill, easy.
So far the only powder that makes %100 fill, %100 burn is Accurate 2495 at 29.1gn.
High 90s fill, easy.
So far the only powder that makes %100 fill, %100 burn is Accurate 2495 at 29.1gn.
Yes, its free and mostly based on Europe data and powders. If I plug in like 30-06 using reloader powder its real close. But off using many Hodgdon powders, some are close within 100fps and maybe 2k on pressure. But my 6.5 grendel is 18" gas. If you have any data for 85gr hammer hunter or 123gr eld on TAC. my 85gr is 2.1660col, the 123 2.245. case is 35.8 h2o.
the slower the powder and shorter the barrel= less burn/burn completion. for the slowest powders you need a longer barrel and/or smaller case capacity. slowest powders tend to perform better in longer barrels as velocity won't decrease as much as medium to medium slow does (again it depends on case capacity). take something that holds 80-100grs with 8133, rl50, h50, 24v41 and 20n29 and with a 30" barrel you still might not get 95% burn rate. i like at least 92% fill and have gone as much as 115%.
