I tested it in my 22" barreled M70 Featherweight Classic, the Jack O'Connor Commemorative model, which shoots really well. Got about the same accuracy and velocity as with H4831SC, around 2900 from a 22" barrel.

The only problem I found with 7977 was running out of powder space, as it's slower than H4831SC. But the velocity is still plenty for anything I'd shoot with the .270, which is all but the big dangerous game in North American and Africa.

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