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#5768935 - 06/01/15 02:02 PM New IMR 7977 power!!
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
I finally was able to put this new powder through it's paces with a 300 WM and 208 A-max with a customer's rifle for a custom load work up. This new IMR 7977 powder is similar in burn rate to H1000. 7977 did very well, and shot very good. I was able to get 2888 fps, low extreme spreads with no pressure signs in a 26" barrel 300 WM with 208 A-max, which is right in line with H1000. I think this IMR 7977 is a little faster burning than H1000, but for sure slower than 4831. I needed a few grains less to achieve the same speeds as H1000. With H1000 being hard to find, I'd recommend giving this powder a look for applications with 4831, R25, and H1000 reloading data (or any similar burn rates). It is a temp insensitive powder and has the copper fouling reducer built into the powder. I am adding this powder to my inventory to load from.
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#5768969 - 06/01/15 02:21 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
redchevy Offline
THF Celebrity

Registered: 10/25/04
Posts: 26986
Loc: Texas
Sounds like a winner.
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#5769066 - 06/01/15 03:37 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
Gravytrain Online   content
THF Celebrity

Registered: 01/06/11
Posts: 23775
Loc: Rowlett, Tx
Does it meter like varget (eg not that good)?

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#5769110 - 06/01/15 04:00 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
jeff1383 Offline
Tracker

Registered: 05/19/11
Posts: 873
Loc: Frisco
Chad do you think this would be a suitable replacement for h1000/retumbo for the 338 caliber family??

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#5769173 - 06/01/15 04:42 PM Re: New IMR 7977 power!! [Re: Gravytrain]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
Originally Posted By: Gravytrain
Does it meter like varget (eg not that good)?


I am using it in a RCBS Chargemaster to throw the initial charge and trickling up on a digital scale. It meters fine for that. In a powder dump, I'm not sure. The kernels are your typical extruded powder.
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#5769180 - 06/01/15 04:47 PM Re: New IMR 7977 power!! [Re: jeff1383]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
Originally Posted By: jeff1383
Chad do you think this would be a suitable replacement for h1000/retumbo for the 338 caliber family??


Yes. My data shows it is within a grain or two less than H1000 for the same speeds with the 208 A-max. Any data with H1000, R25, 4831, etc, would be a great replacement or a good secondary, backup powder. I will always use H1000. But when I can not get H1000, this IMR 7977 will be the go to powder for me. I am always needing to have good powders I can rely on. And when you run out of your main powder, you must have a second powder to go to. This powder will be another choice, instead of H1000, to choose from when starting a load work up for customers.
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#5769237 - 06/01/15 05:25 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
jeff1383 Offline
Tracker

Registered: 05/19/11
Posts: 873
Loc: Frisco
Thanks for the heads up. I'm in the process of gathering components for my 338nm build that's underway. I can't find h1000 but have stumbled across 8lb jugs of ir 7977.

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#5769242 - 06/01/15 05:27 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
It should do fine for that.
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#5769500 - 06/01/15 07:56 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
Beaubien Offline
Bird Dog

Registered: 02/18/15
Posts: 473
Loc: In the mountains east of ABQ
Thanks Chad, will check it out.
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#5770909 - 06/02/15 04:41 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
Bbear Offline
Tracker

Registered: 11/24/13
Posts: 804
Loc: West Texas
Was thinking of trying this in my 26" 264 Win Mag. Think it might work? I've done just a little work-up with the H1000 I have, just not seeing any of that on the shelves.
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#5770930 - 06/02/15 05:00 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 11932
Loc: Lewisville, TX
Yes, it should be good in a 264 WM.
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Custom and Precision Ammunition!!
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#5770978 - 06/02/15 05:32 PM Re: New IMR 7977 power!! [Re: ChadTRG42]
kmon1 Offline
junior

Registered: 09/27/06
Posts: 22468
Loc: Texas
Have thought about trying 7977 in the 6.5-284, but will probably wait until the supply of H4831 is more depleted.

4166 is catching my attention though for several other rounds.
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