H1000 vs. RL33 vs. IMR 7977

[MudRunner2005]

I just shot some IMR7977, H1000, and Retumbo in my 300 RUM on same day trying some different loads.

One thing I noticed, and I wasn't looking for it, was the IMR7977 seemed to make my barrel hotter than the other two powders.

I just wished I'd had a temp gun with me to check barrel temperature.

Interesting that you're in Canada..., the IMR7977 is made in Canada. I guess it has to leave Canada, brought to the USA by Hodgdon/IMR, then get returned to Canada for distribution...

I experienced this with H1000, when comparing it to 7828 SSC. Which is funny because 7828 is a faster powder... But seemed to shoot cooler. I tested it in .257 Wby, 7mm RemMag, .300 WinMag, and 7mm STW. All produced similar results.

I've also had horrible lot-to-lot consistency, and inconsistent loads and velocities, and temp sensitivity with H1000. Which is complete opposite of what the majority consensus is.

 

[Wachsmann]

I tried the 7977 as well in my 6.5 and my rum..In both the velocity was less about 100fps less than retumbo and about 50fps less than H1000. I also did not have very good grouping but I did not try real hard working up a load since the velocity was so much slower.

 

[Buska]

I've been playing with 7977 quite a bit lately and am really liking it. I load it in a 25-06 AI with 115 VLDs and a 270 win with 160 gr Nosler Partitions. Accuracy has been really good but what I'm really liking is the added velocity. In the 25-06 AI I'm getting 3440 fps without pressure and really good accuracy. In the 270 I'm getting 2950 fps with the 160s. Not pushing it all that hard either, stopped at 58.8 grains which is still over a grain under "book" max. Velocity was good and accuracy was good so I just stopped. I was using retumbo in the 25-06 AI before I switched to 7977. Liked it just fine but wanted to experiment and glad I did

 

[boscodog]

Benchracer,
I went a different route.

Full case to the bottom of the neck = QL load density of:

H1000 = 114.8%
Retumbo = 113%
IMR7828SSC = 113%
IMR7977 = 111.5%
RL-33 = 108%

Are we on the same track now.

Cliff

Cliff,
What case are you measuring from, I've been crushing 109grns of RL33 in a standard edge. I love this powder in my gun, all stats are great!

Tom

 

[CliffM]

Tom,
That was using a 6.5 Sherman case, which has a water capacity of 75.5gr with Norma .270 brass.

Cliff

 

[Bbear]

I run RL33 in my 264 WM. Velocities are in the 3225-3250 range with the 142 NABLR. For 7977, my results are similar to Buska - running it in my two 25-06's with 110 AB's. Velocity in one is right at 3225 and in the other one 3175.
Initial loads were developed with temps in the 50's. Loads fired when temp was in the low 100's the RL33 was running about 50-60 fps faster. The 7977 was about 25-30 fps faster. Accuracy was still good in both.

 

[marshal]

Where in Canada are you and where was the powder?

Nechako sports in Vanderhoof has some 7977 in stock

 

[rgmeddn]

Aside from the differences in speed and availability, has anyone used 7977 enough to have an opinion about the major advertised difference; less copper fouling?

 

[Petersen]

I've been playing with 7977 quite a bit lately and am really liking it. I load it in a 25-06 AI with 115 VLDs and a 270 win with 160 gr Nosler Partitions. Accuracy has been really good but what I'm really liking is the added velocity. In the 25-06 AI I'm getting 3440 fps without pressure and really good accuracy. In the 270 I'm getting 2950 fps with the 160s. Not pushing it all that hard either, stopped at 58.8 grains which is still over a grain under "book" max. Velocity was good and accuracy was good so I just stopped. I was using retumbo in the 25-06 AI before I switched to 7977. Liked it just fine but wanted to experiment and glad I did

Where did you start and end for powder charge in the 25.06AI?

 

[Buska]

Where did you start and end for powder charge in the 25.06AI?

For the 25-06 AI I started at 58.0 grains with 7977. I don't have my notes on me but pretty sure I maxed it at 64.0. Fun to tinker with

 

[Petersen]

For the 25-06 AI I started at 58.0 grains with 7977. I don't have my notes on me but pretty sure I maxed it at 64.0. Fun to tinker with

Mine is shooting 115vld great with moderate load h1000 over 3100. Just got a pound of 7977 and see what it does. Thanks

 

[Buska]

Mine is shooting 115vld great with moderate load h1000 over 3100. Just got a pound of 7977 and see what it does. Thanks

Yeah H1000 is great