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Posted: 2/22/2016 11:36:11 AM EDT
Has anyone done anything with IMR 7977 in 300WM yet?

I have been looking for a temp stable powder and tried 75grs behind a 180gr Nosler Ballistic Tip hunting bullet at 3.34 OAL.  Using CCI LRM primer.

Velocities came in at 2850 instead of the roughly 2950 the Hodgdon data shows.  This is quite a bit less.  I verified the chrono with known loads and it is dead on.

I'm getting powder crunch when completing the seating so I don't have much volume left.  Data max shows 75.4.

Anyone run into a similar low velocity showing from 7977 or should I switch to the next faster in the Enduron line, the 4955 and leave the 7977 for 200+ gr loads?

As a comparison, I have been using IMR4350 in 300WM in this same rifle since the late 90s and velocities match expected results.
Link Posted: 2/22/2016 12:22:02 PM EDT
Is your barrel length comparable to the test gun?  Any other component changes?
Link Posted: 2/22/2016 6:19:00 PM EDT
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Originally Posted By towgunner11H:
Is your barrel length comparable to the test gun?  Any other component changes?
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Same bbl length - 24".

Only change from published data is the bullet.  I loaded both 180 Nos BT Hunting and 10 Hornady 180 BTHP.  Both shot within a few feet of each other and 100 lower than published load.

The Hodgdon data is for a SPR MT-SP whatever that is.
Link Posted: 2/22/2016 7:30:16 PM EDT
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Originally Posted By opnblstr:


Same bbl length - 24".

Only change from published data is the bullet.  I loaded both 180 Nos BT Hunting and 10 Hornady 180 BTHP.  Both shot within a few feet of each other and 100 lower than published load.

The Hodgdon data is for a SPR MT-SP whatever that is.
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By opnblstr:
Originally Posted By towgunner11H:
Is your barrel length comparable to the test gun?  Any other component changes?


Same bbl length - 24".

Only change from published data is the bullet.  I loaded both 180 Nos BT Hunting and 10 Hornady 180 BTHP.  Both shot within a few feet of each other and 100 lower than published load.

The Hodgdon data is for a SPR MT-SP whatever that is.


Speer mag tip spire point? Something like that probably.

Check those against ballistics of your bullets. We use Nosler partition 180's. Deadly on anything! Friend took them elk hunting last year.. Way overkill (unless you are shooting at a good distance).

Was accuracy any good? We planned to try 7977 next.

Link Posted: 2/22/2016 7:35:36 PM EDT
As for the powder crunch... using a drop tube will help the powder settle better in the case.
Link Posted: 2/23/2016 6:48:38 PM EDT
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Originally Posted By djryan13:


Speer mag tip spire point? Something like that probably.

Check those against ballistics of your bullets. We use Nosler partition 180's. Deadly on anything! Friend took them elk hunting last year.. Way overkill (unless you are shooting at a good distance).

Was accuracy any good? We planned to try 7977 next.

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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By djryan13:
Originally Posted By opnblstr:
Originally Posted By towgunner11H:
Is your barrel length comparable to the test gun?  Any other component changes?


Same bbl length - 24".

Only change from published data is the bullet.  I loaded both 180 Nos BT Hunting and 10 Hornady 180 BTHP.  Both shot within a few feet of each other and 100 lower than published load.

The Hodgdon data is for a SPR MT-SP whatever that is.


Speer mag tip spire point? Something like that probably.

Check those against ballistics of your bullets. We use Nosler partition 180's. Deadly on anything! Friend took them elk hunting last year.. Way overkill (unless you are shooting at a good distance).

Was accuracy any good? We planned to try 7977 next.



Yes.  Fired in a Ruger M77MKII from the late 90's, 100yd groups while chronoing were slightly under 1 MOA just laying the rifle across a fore-end sandbag in hellish winds.  I have no doubts it would get better if I really tried for accuracy.  Recoil was much less than I expected - far less than a similar rifle in 30-06 shooting the same bullets even 100fps slower.  The -06 loads were with IMR4350.

I am certainly encouraged by this powder.  Mainly wanting to modernize my powders and cut down on all the different powders I have in the house.  I'm at about 100 pounds of various powders now in stick including 8 pounders of common stuff like TG and Universal.  I have found that CFE Pistol does a great job in most of my pistol calibers like 9, 40, 10, and 38 special.

I'd like to get it down to one powder for common pistol like the above, one for open gun 38 Super, one for small rifle like 223, one for 308 class, and one for the big magnums like the 300WM.
Link Posted: 2/23/2016 6:49:10 PM EDT
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Originally Posted By bfoosh06:
As for the powder crunch... using a drop tube will help the powder settle better in the case.
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Going to go look for one now!
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