Guy Miner
Master Loader
- Apr 6, 2006
- 17,695
- 5,562
Excellent! 
IMR 7977 and the 25-06
- Thread starter Bbear
- Start date
ElmerThud
Handloader
- Jul 16, 2011
- 807
- 116
I'm trying to figure out what's the big difference with IMR7977 & IMR4831.
Is it just that the metering is easier & a few more fps than IMR4831?
I'd certainly agree metering 4831 isn't so clean & easy, but I get 3120fps with small ES with bullet seating 110AB's .45" (ogive to lands) and that's in a 22" barrel. Also, an easy peasy 3/8" MOA @ 100yds.
Or is the propellant (7977) designed for heavier bullets than I use?
Although I guess there's no real need for me to improve, there is that 'holy grail' thing makes me wonder :roll:
The thing is, I can't get hold of any in the UK just yet. If anyone did have stock it's gone & there aint no more right now!
Cheers, ET
Is it just that the metering is easier & a few more fps than IMR4831?
I'd certainly agree metering 4831 isn't so clean & easy, but I get 3120fps with small ES with bullet seating 110AB's .45" (ogive to lands) and that's in a 22" barrel. Also, an easy peasy 3/8" MOA @ 100yds.
Or is the propellant (7977) designed for heavier bullets than I use?
Although I guess there's no real need for me to improve, there is that 'holy grail' thing makes me wonder :roll:
The thing is, I can't get hold of any in the UK just yet. If anyone did have stock it's gone & there aint no more right now!
Cheers, ET
Bruce Mc
Handloader
- Oct 26, 2005
- 1,236
- 508
7977 is a little slower than 4831 but its biggest benefit is its improved temperature stability.
ElmerThud
Handloader
- Jul 16, 2011
- 807
- 116
SJB358":1twf1mkx said:
I think you're very likely right Scotty. Since I din't have real extremes of temperature here in the UK, there's nothing to worry about with IMR4831, although I must admit if I were loading large quantities of ammunition, an easier flow through the thrower would be nice.
I guess if some IMR7977 turns up in the UK I'd give it a go just for a better flow through the thrower.
Cheers, ET
