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IMR 8208 XBR + .308 A-Max

This is a discussion on IMR 8208 XBR + .308 A-Max within the Ammunition forums, part of the M14 M1A Forum category; I am new to reloading and was wondering if anyone has any load data with 8208 XBR with .308 Hornaday A-Max bullets. I was thinking ...


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Old June 11th, 2012, 04:48 PM   #1
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IMR 8208 XBR + .308 A-Max

I am new to reloading and was wondering if anyone has any load data with 8208 XBR with .308 Hornaday A-Max bullets. I was thinking of using 39.5gr on the low end as I'm not looking to push my gun to the limits any info would be greatly appreciated.

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Old June 11th, 2012, 05:08 PM   #2
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Please be careful with IMR 8208XBR
I would not recommend it for bullets over 150 grains.
Pressure can spike very quickly with this powder.
RAMMAC and I did load testing when this powder first came out.
It seems to be most accurate at pressures I am not comfortable putting my rifle through.
If others have had better results, please chime in.

Glenn

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Old June 11th, 2012, 05:17 PM   #3
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I have found 8208 to be a bit hot for my 155 smk's.

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Old June 11th, 2012, 06:54 PM   #4
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I've been trying to find a good load with it using 175gr SMKs. I've gotten reasonable results. I've still yet to get the results I've gotten using IMR 4064 or RE15.
Your absolutely correct about pressure spikes. I've also found bullet seating depth to be very critical to pressure as well. I blew the ejector off my bolt. BE CAREFUL!!!

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Old June 11th, 2012, 10:30 PM   #5
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I like IMR 8208 XBR It flows nice and burns clean, I use 147g pulled Israeli FMJBT.
I shoot them out of a 22 inch SS NM SA
I have loaded 42g and 41g my next loading will be 40g
I do not have a chronograph, The empty's land at 2:00 about 6 feet away.
The 42g are not too hot, I'm just a cheap B that likes to get the most out of a pound of powder.

I know... Put it on paper..

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Old June 12th, 2012, 05:55 AM   #6
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These last few months I burned a case of 8208 for my short line ammo. My previous number 1 gun loves the charge at 44 grains pushing molied 155 Noslers, the current 14 I am using in competition prefers 42 grains pushing the same bullet. I use it for my hunting load as well, out of the 22 incher I get over 2800 FPS pushing the 155 VLDs and the accuracy is great. The charge is 45 grains in once fired Remington cases.

The best feature of the powder is the kernel size - meters great thru the powder measure in the Dillons. I am now working on the 2nd case of powder. As much as I shoot I needed a powder that meters well, it gives me the confidence that the charges will be within the acceptable window of my target weight cranking the ammo through the Dillons.

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Old June 12th, 2012, 12:15 PM   #7
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From what I'm reading on the forums this powder can be difficult to manage. I'm very new to reloading so will use it for my .223 rounds that I have already loaded successfully with and pick up another powder thats less volatile for my .308 loads. Thanks for all of the replies and assistance.

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Old June 12th, 2012, 11:16 PM   #8
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Quote:
Originally Posted by tguth01 View Post
From what I'm reading on the forums this powder can be difficult to manage. I'm very new to reloading so will use it for my .223 rounds that I have already loaded successfully with and pick up another powder thats less volatile for my .308 loads. Thanks for all of the replies and assistance.
If that's the way you feel you may be missing out on a great powder. There are many out there that will do the job, and there's better.
With a improper load the best powder can hurt you.
I have a can or two of 4895, and 4064 both great powders but I'm using 8208 from now on.

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Old June 12th, 2012, 11:58 PM   #9
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From what I have read and researched the issues turn up on shorter barreled actions like the SOCOM or to a lesser degree Scout models. Still why stress an action when there are others out there that will do essentially the same thing without the extra danger/potential wear.

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Old June 13th, 2012, 07:31 AM   #10
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This powder was to my understanding, introduced or maybe should say reintroduced at the request of bench rest shooters. I guess many years ago, this powder or one very similar in characteristics, was on the market and bench rest shooters loved it. For whatever reason it was discontinued. Now it's back.

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Old June 13th, 2012, 08:22 AM   #11
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Yes that is what i gathered as well. Bench rest shooters who were using bolt guns and out of 20+ inch barrels. I'll stick to the tried and true 3031 and 4895.

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Old June 13th, 2012, 08:42 AM   #12
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For what it's worth, here are some pressure and speed estimates based on a 168gr Hornady A-Max bullet in a higher volume commercial case (like Lapua) and an average milsurp case, both charts also use a COAL of 2.83" which reduces pressure a little;

COMMERCIAL CASE


MILSURP CASE


NOTE - the Pmax column is equivalent to the chamber pressure that the rifle would experience. Pmuz is related to the gas port pressure but it is at the muzzle instead of the port and it is about half the value that the port pressure would be.

In general, 42-43 grains would produce pressures of about 53,000 - 57,000 PSI in the higher volume commercial cases. Military surplus cases would only need about 1 grain less to produce pressures in the same general range.

After reviewing the data a little more, it seems that the pressure produced by IMR 8208 XBR raises in a linear fashion (it doesn't jump unexpectedly high at any point) but it does produce higher pressures quicker than the more commonly used M1A powders.

The port pressures seem to be more mild than the other common powders.

Barrel length will not change the chamber pressure profile of any powder so regardless of which M1A model you are using the pressures will react the same as the charts above indicate. The barrel length will have an effect on muzzle velocity and the shorter barrels will of course produce slower speeds compared to the longer barrels. Faster burning powders will, in general, produce higher velocities out of the shorter barrels, that being the reason that I use IMR 3031 or IMR 4198 with my SOCOM. The faster powder (IMR 4198) works better with the lighter bullets so I assume that I could use IMR 8208 XBR with a lighter bullet but I've already found a good load using other powders.

My best 8208 load was 44gr in a Lapua case, under a 155gr Hornady A-Max. Pressure was about 54,000 PSI, port pressure was just about maxed, and velocity was 2750 fps, but I found that I got lower pressures (about 49,000 PSI) and about the same speed and accuracy with IMR 3031, so I decided to use the powder that didn't pound the rifle as hard. I might get back to trying 8208 in the future but right now I don't have the time or inclination to experiment with it again.

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Old June 13th, 2012, 08:44 AM   #13
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8208 in the M14

8208 is an excellent powder for the M14. I'm using and have been using for two years 40.7 grs. of 8208 CCI BR2 primer and a 167 gr Lapua Scenar. Accuracy in most rifles is far above average. It is our QC load for accuracy. It rivals FGMM.

Burn characteristics are excellent for the M14.

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Old June 13th, 2012, 12:23 PM   #14
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"Barrel length will not change the chamber pressure profile of any powder so regardless of which M1A model you are using the pressures will react the same as the charts above indicate. The barrel length will have an effect on muzzle velocity and the shorter barrels will of course produce slower speeds compared to the longer barrels."

This is true but if someone is trying to get the velocity up in a short barreled gun they may inadvertently add too much powder and damage the gun because the shorter barrel does reduce velocity. I should have been a little more clear. I have seen people do it in short barrel AR's and AK's (10.5 and 11.5 inch) to offset the negative effects of the short barrel in relation to velocity and thus increasing the charge even slightly can get you in dangerous territory really quick with this powder. I think the disclaimer would be use this powder only if you have a fair amount of reloading experience.

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Old June 13th, 2012, 12:50 PM   #15
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Sounds like something to avoid for a new reloader.

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