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Author Topic: 458 SOCOM Load Data  (Read 27771 times)

bartonmd

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Re: 458 SOCOM Load Data
« Reply #15 on: May 01, 2012, 10:12:56 AM »

From Barnes for the 300gr TTSX/Tac-TX bullet:

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hardwickbv

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Re: 458 SOCOM Load Data
« Reply #16 on: May 11, 2012, 04:53:56 PM »

Not too impressed with these numbers


AR-Comp with 325 grain FTX OAL 2.20

39.4 grains 100% case fill gives 1537 FPS 22793 PSI 3807 PSI at Muzzle

Bob
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Flintknapper

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Re: 458 SOCOM Load Data
« Reply #17 on: May 11, 2012, 08:35:16 PM »

Not too impressed with these numbers


AR-Comp with 325 grain FTX OAL 2.20

39.4 grains 100% case fill gives 1537 FPS 22793 PSI 3807 PSI at Muzzle

Bob

It wasn't too hot with the 405 REMY either. There are better powders. What is the length of the FTX bullet, I did not have that parameter to enter.
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244

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Re: 458 SOCOM Load Data
« Reply #18 on: May 11, 2012, 08:51:53 PM »

I measured the Hornady 325 gr FTX at 1.103", FYI.  Thank you Gentlemen for your help.

I agree that AR-Comp seems a little too slow.  Too bad PP 300 MP, Varmint, and 2000 MR aren't in the QL database.
« Last Edit: May 11, 2012, 11:13:23 PM by 244 »
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Quinc

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Re: 458 SOCOM Load Data
« Reply #19 on: December 03, 2012, 10:51:20 PM »

Chronograph 10ft away from muzzle.


Rem 405gr Bullet
Starline Brass
IMR 4198 33gr
CCI 300
OAL 2.135

AVE. FPS 1296fps
No pressure signs:



500gr HRN FMJ
Starline Brass
IMR 4198 22gr
CCI 300
OAL 2.035

AVE. FPS 708.1

^This load leaves alot of unburned powder in the barrel. I will post back with the same load and magnum primers.

RRA 16" Carbine with newly MicroSlicked bolt.








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Deprime

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Re: 458 SOCOM Load Data
« Reply #20 on: November 12, 2013, 11:44:52 AM »

New guy from Indiana.  I've been lurking for a while and have gotten a lot of good info from this site.  Just now getting around to posting.

Here are some loads that I tested the other day using the Hornady 325gr FTX.

I was shooting a RRA Mid-length upper on a Spikes lower with the RRA 2-stage trigger.  I was using a Lead Sled and Vortex Strikefire for my optic.

The chronograph was approximately 6 feet from the muzzle.

In case anyone was curious as to the large jumps in powder charges between the loads I was using intermediate single round loadings for pessure checks.  I did not have enough components to load a full 5 rounds for each powder charge increment.  DO NOT USE THE MAX LOADS LISTED IN THE TABLE BELOW AS THEY EXHIBITED OVERPRESSURE SIGNS

I see that some others have been going with up to 2.200" COAL with this bullet.  I might try some other test loads with a longer COAL to try and get some more velocity without showing pressure signs.

I was happy with the 35.5 grains of IMR4198 (1.88" group) and will be going with that load as my hunting load for the time being.

« Last Edit: November 13, 2013, 12:25:19 AM by Deprime »
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Big Bore

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Re: 458 SOCOM Load Data
« Reply #21 on: November 12, 2013, 02:37:31 PM »

I cannot help but notice the huge jumps in your powder charge, around 1.3 gr. for H110 and as much as 1.5 gr. with IMR 4198.  Please tell me you were not increasing your load by that much in your load ladder.  You should not be increasing your load by more than .5 gr of powder with each load tested, and remember, by the time you see ANY flattening of the primers you are already way past safe pressures.
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Deprime

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Re: 458 SOCOM Load Data
« Reply #22 on: November 13, 2013, 12:22:02 AM »

I cannot help but notice the huge jumps in your powder charge, around 1.3 gr. for H110 and as much as 1.5 gr. with IMR 4198.  Please tell me you were not increasing your load by that much in your load ladder.  You should not be increasing your load by more than .5 gr of powder with each load tested, and remember, by the time you see ANY flattening of the primers you are already way past safe pressures.

In hindsight I should have included this in my initial post.  I had loaded single round intermediate loads between the listed test loads for pressure checks.  I did not have enough components to load a full 5 rounds of each load increment and have enough bullets left for loading up my hunting rounds.

I have revised my table to reflect that the max load shown showed overpressure signs and added to my original post the presence of intermediate loading to check for pressure signs.  Hopefully this avoids any confusion.

BTW, below is a picture of fired cases from the IMR 4198 loads.  The one on the left is the 3.5gr load and on the right is the 37gr load.  The H110 exhibited similar pressure signs with the max loading.

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Big Bore

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Re: 458 SOCOM Load Data
« Reply #23 on: November 13, 2013, 06:18:31 AM »

Good to know.  Years ago I was reading an article put out by either Lyman or A-Square (which by the way, has an incredibly great section in their manual about pressures that every reloader should read) about how they do pressure testing.  They do each load consisting of 10 rounds at each given charge increment in their pressure barrels.  If ANY of the ten loads exceed maximum allowable pressure then that load is considered above maximum and the next lower charge that did not have any of its rounds exceed maximum pressure is re-tested.

  Powders are funny animals and they do not always behave consistently and pressures can fluctuate widely, by several thousand CPU or PSI so that while some loads are a given level may be just fine, one may be enough to actually cause damage to the cartridge or rifle, flattened primers, blown primers, stretched frames…

I know we have all seen proof of this in our loadings.  Everything is going along just fine then all of a sudden a round clocks significantly higher than the others and you may see a flattened primer or even a blown primer.  Humans being what we are, we are very likely to dismiss this as a fluke and continue on loading, and even at the next higher charge we might not see any signs of over pressure and we delude ourselves into thinking we are just fine and dismiss the warning sign.  But we are still into an area where that powder is not stable and can produce unsafe fluctuations in pressure.
  That is the reason one needs to test more than one round at each level.  I know, components are expensive and sometimes limited, but a broken rifle or broken body is even more expensive.  Be extremely careful going up in charge with a sample size of one.  You could find yourself in dangerous territory very quickly.  That one in ten OP round becomes one in five becomes one in three... but if one is doing a sample size of 1, then one may be in the realm were every round is OP with extremely high, even destructive spikes, before anything shows up on the case as being out of normal.

 
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45longcolt

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Re: 458 SOCOM Load Data
« Reply #24 on: November 17, 2013, 11:51:52 AM »

With all the talk of the IMR4198 powder going on and seeing how I just transitioned from RL7 to IMR 4198 I thought I would test some of my loads again today.  I loaded up some cases with 37 grains of IMR4198 powder, old metal can BTW of this stuff, and used 325 grain FTX bullets with CCI 350 primers, 2.22" COL.  I had used this load previously with newer powder and all was OK.  It still did just fine in my rifle.  Here is a shot of (10) cases out of (20) I randomly picked from the lot.



These are older cases so they do show some wear but no bright marks from today's shoot and the primers look fine.  Ejection is 6-10 foot away so that is about right too.  Today I only had a 25 yard spot to shoot from at the target, left my target stand lower piece leaning on the truck as I drove off today.  I am sure someone will keep it safe for me.  Anyway the lower target is (10) shots at 25 yards and the upper one is (4) shots after some scope tweaking.   



No speed checks today.  Recoil felt on par with the RL7 loads if not a tad but stronger.  I have the bruise on my right shoulder to prove all of this too but I had fun making it happen there.   :)

So this really does show that our rifles our a little different than another 458 Socom and one load may do just fine in one rifle but not in another.  We each need to find a balance we desire, safety #1, case life, accuracy and speed. 
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