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2.260 c.o.a.l vs 2.250 in 223

Nosler recommends setting the coal on their 223 55gr Varmegeadon fb tipped at 2.260
I goofed on a batch and set them at 2.250 which is 10 thousands shorter.
Now, I am using 23gr. of H335 which is at 80% of case volume and their lowest load for the H335.
Granted I will see a slight increase in pressure but, IMHO being its 5.56/223 its probably really a slight change being bottlenecked cases.
Am I correct in this thinking being they are still is what is considered saami max col
How much powder do you think that would equal if one where to try to obtain that said pressure in a recommended 2.260 col/coal case.
I have no calculations to know how much powder fits in a neck area of a 223 round at a height of 10 thousands of a inch area.
OR another way I could ask is do you think with the slightly shorter coal I will exceed say pressure of one loaded at 24 gr. to a length of 2.260?
Thanks
 
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Really just suck it and see.
Who knows, your rifle might like the shorter COAL.
Each rifle is different and until you work through careful load development there is no way to tell what will work best.
My 223 doesn't like H335 much in all the bullet weights I use.
 
That's from a accuracy standpoint "just suck it and see" I presume.
I am wondering from a weight and volume change difference.
I wonder how much the volume inside the cartridge changes upon that difference and what the pressure change is.
 
I normally shoot 25gr of H335 with 55gr pills as short as 2.240 (normally 2.250 though) in 1:9, 1:7.7, 1:7 barrels with 5.56, 223RemMatch and wylde chambers. This load is not over pressure in any of them. Book length for the 55spr sp is 2.20.
 
If this is for an AR15, 2.26" is asking for trouble. It is inviting magazine jams because bullets vary in length by more than 10 thou. Keep your loads at or below 2.25" and you will never have a problem.
 
That's from a accuracy standpoint "just suck it and see" I presume.
I am wondering from a weight and volume change difference.
I wonder how much the volume inside the cartridge changes upon that difference and what the pressure change is.


You will not see any change in pressure and you will not see anything else - stop worrying and shoot them.
 
You will not see any change in pressure and you will not see anything else - stop worrying and shoot them.

+1 On that... I only load around 2.220 with a hotter load and have no problem.. As stated above any longer than what your loading and they won't fit in your magazine...
 
Col difference is due to magazine differences. My steel mags lete seat to 2.265; friends Magpul is 2.250 to feed reliably.

Change in seating depth will cause pressure changes; physics is physics. Always work up loads. Is the change significant for your load in your rifle? Only you can say; my rifle isn't yours.

-Mac
 
Col difference is due to magazine differences. My steel mags lete seat to 2.265; friends Magpul is 2.250 to feed reliably.

Change in seating depth will cause pressure changes; physics is physics. Always work up loads. Is the change significant for your load in your rifle? Only you can say; my rifle isn't yours.

-Mac

"Change in seating depth will cause pressure changes; physics is physics."

You can debate the number of angels on the head of a pin all you want to, but the 1/100th" seating change is so far down in the variances (aka "NOISE") that is a silly discussion best left for people that are bored and have too much time on their hands.

He is asking for practical information, not theoretical monologues.
 
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Nosler recommends setting the coal on their 223 55gr Varmegeadon fb tipped at 2.260
I goofed on a batch and set them at 2.250 which is 10 thousands shorter.
Now, I am using 23gr. of H335 which is at 80% of case volume and their lowest load for the H335.
Granted I will see a slight increase in pressure but, IMHO being its 5.56/223 its probably really a slight change being bottlenecked cases.
Am I correct in this thinking being they are still is what is considered saami max col
How much powder do you think that would equal if one where to try to obtain that said pressure in a recommended 2.260 col/coal case.
I have no calculations to know how much powder fits in a neck area of a 223 round at a height of 10 thousands of a inch area.
OR another way I could ask is do you think with the slightly shorter coal I will exceed say pressure of one loaded at 24 gr. to a length of 2.260?
Thanks

You are over thinking this, 10 thou is going to make very little if any difference. Go shoot.

It is good to pay attention to your load process but Nosler data is given using their brass. Are you using their brass? Case capacity varies from one manufacturer to the other.

80% case fill is kind of low for a good working load IMO.
 
If this is for an AR15, 2.26" is asking for trouble. It is inviting magazine jams because bullets vary in length by more than 10 thou. Keep your loads at or below 2.25" and you will never have a problem.

Some of my magazines I load as far out as 2.295 and feed reliably(not 55gr bullets though). Measure your mags to be sure, pmags are usually on the shorter side. Also making sure your upper is in spec at the feed ramps, polish any overlap the barrel extension may have there.
 
USGI mags should not be loaded with ammo having a nominal length greater than 2.25".

(Notice I don't go to the thou place - it isn't relevant.)
 

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