MudRunner2005
Well-Known Member
I've had some 7977 for years (since it hit the shelves), but due to life getting in the way, I had not gotten around to trying it until about a month or 2 ago. It's similar to H1000 in burn rate, so slightly slower than 7828 (which I have had excellent luck with in my .25-06 AI and .30-06 AI). I tried the 7977 in my .300 Ackley, and was getting good velocities, excellent case fill, and an SD of 7, and an ES of 14 (MSv2 readings). So, appears to be VERY consistent burning. I instantly became a big fan when I saw those ES & SD numbers.I've always had great luck with 7828 but with these lighter bullets I'm thinking H1000 in the WBY. I haven't reloaded 257 WBY in a few years so I'll be going back to the books and doing some comparative research. Have not tried 7977 in anything yet.
With the heavier 131 ACE's, I could see 7977 being one of the top performing powders in the .25-06 Rem/AI, and the .257 Wby with it's full case fill and slower burn rate/lower pressures.
I've been wanting to get some 8133 to try. It's supposed to be similar to RL-33 in burn rate, but being an Enduron powder, extremely temp stable and consistent. If it's anything like 7977, I think Hodgdon/IMR has found a winner for the big magnums. I'd like to try it in my 7mm STW's and .300 Ackley.