Best Powder for 300WM 200 gr Accubond?

[sambo3006]

I'm going to work up a load for my buddy's 300WM for our elk hunt in October. What powder would be the best burning rate and stability for this round with the 200 gr Nosler AB? I have IMR 4350, 4831, 7828, RL22, H1000 and Retumbo on hand. I have seen similar top velocities listed in various manuals--2950 to 2975 fps-- with powder ranging from IMR 4350 to H1000. Case capacity is a consideration since this is a factory gun and the rounds have to be seated for the magazine. The loads of 4350 were 8 or more grains less than the H1000, I don't remember exactly. 4350 seems fast for a 200 gr bullet and H1000 seems slow.
I have had great luck with IMR 7828 in my 7STW, 7RUM and 338RUM. Anybody tried this powder for 300WM 200 gr AB?
Thanks in advance for your input.

Sam

 

[magicofmt]

I had the best luck with H-1000, it shot better than the others in my gun.

 

[chain]

Between 76.3 and 76.7 gr of H-1000 shoots best for me. I am fine tuning tonight or Fri. Will have chrono then too

 

[longgunshooter]

IMR 4831 did ok for groups but i never had a chrony with me while i was testing them.
so far i have opted to go with 73gr R-22 w/ the AB's,getting low 2900's out of my 25" factory tube while printing sub moa 5 shot groups @ 100 yds. COAL 3.630
will try to test the same load @ 300yds here soon.

 

[duckinalaska]

Hey guys take a look at this web page

 

[sambo3006]

I chrony'd a few loads today. I decided to forgo the H1000 due to case capacity reasons. My friend's gun is a Savage detatchable magazine 24" barrel and he wants rounds to fit the mag. I have to seat the 200's very deep to go in the mag. I was compressing loads on the upper end of all three of these powders. Here is what I got. All loads were a grain or so over the listed max (I worked up in 1 grain increments). New Winchester brass, Fed 215 match primers, Temp 74.

IMR 4831 72 gr 2923 fps
IMR 7828 75 gr 2923 fps
RL22 73 gr 2930 fps

Extraction was easy on all loads and there were no bright marks on case heads. Some flattening of primers but no cratering.

I think I could go up another grain or grain or 2 with any of these powders. I might reach 3000 fps which would be outstanding, but I'll settle for whatever I can safely get. Next step will be shooting some groups. Fun fun!

 

[sambo3006]

Shot a couple of rounds today with 75 gr RL 22 and 200 AB.(easy extraction with 74 gr, no marks on case head) Easy bolt lift and extraction and just a faint hint of a shiny mark on the case head. This is definitely max that I would be comfortable with. Temp was 70. Shot 1 was 3020 fps and shot 2 was 3009 fps. Recoil isn't really that bad suprisingly. I'll have to shoot some groups when I get another cool day. This should be an elk thumper. I think my hunting buddy will be pleased with the performance of this load.

 

[ATH]

I've used 74gr Re22, only shot a couple over the chrono so far just under 3000. No pressure signs, easy bolt lift (factory Sendero).

Obviously work up though, I started under 70.

 

[Hired Gun]

While not a 300 Win I have found IMR7828 works best on my 200 grain Accubond in my 300Wby. 85.5 grains yeilds 3100 fps and .5 moa accuracy.

 

[RogerK]

I fired 73.5 grains of R22 behind a 180 grain Barnes X FB bullet. That was my standard load for something like 15 years until I burned out the barrel of my Model 70. That took 5,000 rounds.