I am using 24.5 gr H4895 75gr BTHP
My book said that this will give me about 50,000 PSI but when ever I talked to Hornady they say
that's too hot.

I don't see any signs of pressure not to mention that m855 and m193 is anywhere from 55,000 to 60,000. I also did mention to them that I am using an AR15 with 5.56mm chamber. They all said that's too hot, what gives.

CYA. Did you ever consider reloading the same shell several times with usual procedures and careful checking of primer appearance, possible case wall thinning, primer seating, and so on? Every gun is different, including custom pressure guns at Hornady.

I loaded enough for my battle pack.
I will stick to 24gr Varget now.

quote:

I am using 24.5 gr H4895 75gr BTHP
My book said that this will give me about 50,000 PSI but when ever I talked to Hornady they say
that's too hot.

What book are you looking at? Hodgdon'd data shows a max of 23.8 with a 75 gr JLK VLD and 23.0 with a 77 gr Sierra both in excess of 50k psi. If the bullets are at all similar then the 24.5 grains is over max.

LWD

I've never tried that combo. Loadtech calls it around 55250.

quote:

Originally posted by 1lostinspace:

My book said...

You must not be using the same 'book' as me, cause this is what my 'book' says:

quote:

We have to note that military chambers do not necessarily meet current SAMMI chamber specifications, also military 5.56mm Ball ammunition does not necessarily meet current SAMMI ammo specs. So, we advise against firing any military ammunition in any commercial chamber. Further, we strongly caution against using commercial ammunition or handloads in military chambers. Use extreme caution.

another problem of too hot of loads is bolt slam on any semi- auto.it wears the rifel/pistol out fast.

what loading book are you using and what volume is it?im thinking your using a book from the 70's

Err on the side of caution.

It looks hot to me but only you are responsible for your actions. Nate

22 Grains of IMR4895 and the 77 Grain Sierra, is to hot in my DPMS AR Barrel. The bolt tears the extractor groove right off. But I have another AR that handels the load easily. It seems then, that all these barrel, chambers are different, and a wise shooter pays attention to what his equipment does whith what he feeds it. For if he dosen't, and the equipment has problems, it will surly let him know, QUICK!

Jerry

quote:

Originally posted by 1lostinspace:
I loaded enough for my battle pack.
I will stick to 24gr Varget now.

I`d take a second look at this load also.


Hornady lists their 75gr HP with 23.5 gr of Varget for the 223.
Sierras #5 shows 23.9gr varget with their 77gr MK, and Hodgdon lists 23.9 gr Varget with a Sierra MK for the 223 in their 2006 magazine type manual.
The Sierra and Hornady listings are specificly for AR15 type rifles, the Hodgdons is generic. I`d cut a gr off both loads to start and see how they shoot.
There is no real need to run the 223 at max with this bullet. The RCBS load program I have shows a 75 gr Hornady at 2700 fps as dropping 53.9" and when driven at 2600 fps 59" at 500 yds, this is with a 200 yd zero. I doubt you`ll notice the extra 5" in the field.

i got my data from Hodgdon magazine that just came out it list 24.5 H 4895 and 25 varget with 75 gr bullet

May I inquire as to " WHY " you want to proof the weapon ?. I doubt very seriously if it's any more accurate than if you cut that load by 10 -12 % .

It's hard on the weapon when banging 55K and above pressure not to mention on the cases .

I load for accuracy not velocity !.Every once in awhile they collide but more times than not it's slower producing better accuracy .

Just my $ 0.0025 worth of input .

Shoot Straight Know Your target . ...

actually I get sub moa at 200 with H4895

You guys are right I think I am going to stay with 24 gr Varget but 24.5 H4895 shoots best out of my AR

Well so do I and sub of .5 " . I still see no real reason to " Proof " the weapon every time though .

Mine actually shoots 62 -70 grain better I'll post at another time . this is with 55 grain Remington bulk YES bulk bullets . With 25.5 grains BL-C2 powder . STD max magazine length for feeding .

As you can see I spare no expense for my targets !. Ha Ha

Your looking at 16 Shots total . 5 Factory Winchester upper left . 10 hand loads plus a fowler to start off with . Note points of impact changes . My 10 measure .325 " Winchester are all over the place vertical stringing !.

Shoot Straight Know Your target . ...
AR 15 100 yd 55 grain

quote:

i got my data from Hodgdon magazine that just came out it list 24.5 H 4895 and 25 varget with 75 gr bullet

My 2007 Hodgdon manual does not list this bullet. What year are you looking at? Is the 2008 edition out?

quote:

but 24.5 H4895 shoots best out of my AR

Who cares how well it shoots if it beats your gun apart?

LWD

Well, 25 grains of H 4895 are not "too hot" with a 75 grain bullet in my Savage 12, or in my Ruger with the PacNor barrel, with a one in 8 twist...

nor is 25 Grains of Varget either...

both are very accurate, including H 4895, and H 4895 in one of my least favorite powders to boot!!!

quote:

Originally posted by LWD:

quote:

I am using 24.5 gr H4895 75gr BTHP
My book said that this will give me about 50,000 PSI but when ever I talked to Hornady they say
that's too hot.

What book are you looking at? Hodgdon'd data shows a max of 23.8 with a 75 gr JLK VLD and 23.0 with a 77 gr Sierra both in excess of 50k psi. If the bullets are at all similar then the 24.5 grains is over max.

LWD

no offence, but its only .7gr over max...books are a great guide but i certainly dont live my life by them.

quote:

Originally posted by Jerry Eden:
22 Grains of IMR4895 and the 77 Grain Sierra, is to hot in my DPMS AR Barrel. The bolt tears the extractor groove right off. But I have another AR that handels the load easily. It seems then, that all these barrel, chambers are different, and a wise shooter pays attention to what his equipment does whith what he feeds it. For if he dosen't, and the equipment has problems, it will surly let him know, QUICK!

Jerry

Excellent post!
-----

Hey 1lostinspace, If you would like to find out what is actually going on in your rifle, so you are not totally lost-in-space, you might want to try measuring CHE & PRE. It only takes a short amount of time to learn and you will no longer have to be concerned about your Pressure being too high (or too low). It works with ALL cartridges, in every action type, and won't cost you an arm and a leg.

Best of luck to you.

quote:

no offence, but its only .7gr over max...books are a great guide but i certainly dont live my life by them.

Well, it's only .7 over max for one bullet that's he's not using and 1.5 over max for another bullet that he's not using!

I certainly agree that with any given rifle some loads may be workable that are over maximum that would not be in other rifles.

However, the key points here are (1) that the bullet manufacturer tells him it's too hot and (2) that he's using this load based on non-existent data---this load is not listed in the 2007 Hodgdon manual or on its website.

LWD

no you guys this data comes from Hodgdon new magazine. not to mention I have a 5.56mm chamber that can with stand 17,000 psi more than a .223

quote:

Originally posted by 1lostinspace:
...not to mention I have a 5.56mm chamber that can with stand 17,000 psi more than a .223

Is it made from that new Kryptonite I've been hearing about? If so, then that makes all the difference in the world!

Overload to your heart's content. Just be sure you notify any innocent bystanders in the vicinity of your shooting point at the range.

By the way, if you already know it all, why did you bother to ask us in the first place?

Great Post!! lol!!!

Jerry

quote:

Originally posted by onefunzr2:

quote:

Originally posted by 1lostinspace:
...not to mention I have a 5.56mm chamber that can with stand 17,000 psi more than a .223

Is it made from that new Kryptonite I've been hearing about? If so, then that makes all the difference in the world!

Overload to your heart's content. Just be sure you notify any innocent bystanders in the vicinity of your shooting point at the range.

By the way, if you already know it all, why did you bother to ask us in the first place?

Military M16s have slightly more headspace and have a longer throat area, compared to the SAAMI .223 chamber spec, which was originally designed for bolt-action rifles. Commercial SAAMI-specification .223 chambers have a much shorter throat or leade and less freebore than the military chamber. Shooting 5.56 Mil-Spec ammo in a SAAMI-specification chamber can increase pressure dramatically, up to an additional 15,000 psi or more.

I am making sure that the info that I have read is the same. There is no reason for you to try and mock me. Kryptonite that's a good one.

Still see NO real reason to beat or proof a weapon every time you use it !. Throats them faster to boot !.

If it's not as accurate with a lessor charge then Yea bust the gills , but I'd be surprised if it's not just as accurate or more accurate with less powder !.

Shoot Straight Know Your Target . ...

quote:

Originally posted by Dr.K:
Still see NO real reason to beat or proof a weapon every time you use it !. Throats them faster to boot !.

If it's not as accurate with a lessor charge then Yea bust the gills , but I'd be surprised if it's not just as accurate or more accurate with less powder !.

Shoot Straight Know Your Target . ...

That what I thought too, I worked up to that load and found out that my gun shoots 24.5 grain h4895 in 75gr more accurate then anything else.
Also 24 gr varget worked good. But I hear you for plinking i plan on using a medium load, but for my battle pack I am loading to the max.

Are you planning on going into battle?

quote:

Originally posted by craigster:
Are you planning on going into battle?

How do you plan for a battle?

here is the data from their website

Load Type: Rifle
Starting Loads

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Maximum Loads

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Bullet Weight (Gr.) Order BW Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure

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75 GR. JLK VLD 75 H4895 .224" 2.250" 22.5 2696 39,900 CUP 24.5 2905 50,000 CUP