Favorite .338wm powders?

I had tried IMR 4350 with 250 Partition in 338 Win Mag - current loading for that rifle is RL-19, Fed 215 primers, W-W cases and 225 Accubond bullets. Notes that I can find say that I used R-P cases, Fed 215 primers, RL-15 powder and 200 grain Ballistic Tips. I also used the RL-19 with 210 grain Partitions - Fed 215 primers and R-P cases.
 
thank you for the the responses. I will more than likely be shooting 225gr speers, maybe some interlocks. Was looking at accubonds but the prices are ridiculous. Looks like 4350 it is as RL 19 is so scarce, I managed to get some 15 today for a good price but gonna use that in my 7/08
 
Any reason IMR 4350 rather than H4350?
I load 225gr and 250gr bullets/338Mag with H4831sc with good velocity/accuracy results. I have used RL19 also, but it is impossible to find in my experience of late.
 
big bear said:
Any reason IMR 4350 rather than H4350?
I load 225gr and 250gr bullets/338Mag with H4831sc with good velocity/accuracy results. I have used RL19 also, but it is impossible to find in my experience of late.
Click to expand...
IMR is just what I have a supply of currently, due to powder prices I kind of just buy what comes available at an affordable price.
 
big bear said:
Any reason IMR 4350 rather than H4350?
I load 225gr and 250gr bullets/338Mag with H4831sc with good velocity/accuracy results. I have used RL19 also, but it is impossible to find in my experience of late.
Click to expand...
No reason, Imr always worked well. IMR and H 4831 work good as does rel 22 and 19.
 
I'm not going to knock any of the 4350 burn rate powders, but IMHO, they're to fast for the 338Win Mag with bullets 225 grain and heavier.

IMHO, there isn't much sense going to a magnum cartridge if you aren't going to shoot medium to heavy bullets in the caliber.

Norma MRP

VVN160/VVN165/VV550/VV560

Hybrid 100V/Superformance

Rl19/RL22 if you can find it

IMR4955/IMR7828

ALL WITH MAGNUM PRIMERS

With magnums, I find the most consistent accuracy and close to best velocities will be had with powders which fill the case to the shoulder or even slightly compressed.

You can't do that "safely" with any of the 4350 burn rate powders

Some I have listed are close but all are slower.

I helped a young fellow this spring with a Winchester Mod 70, 338 Win Mag, loaded with Hornady 225grain FBSP Interlock bullets to work up a load with the powders he had on hand. He got the rifle from his deceased Uncle as a "legacy" about ten years ago, and he was always afraid to shoot it.

He had several pounds of IMR4350, which his uncle also used to load for the rifle, but couldn't get it to shoot better than sub 3inch groups at 100 yds.

I looked up some of the loads, used back when I felt I needed this much power, in my notebook.

The one load which stood out in four different rifles, was with IMR7828 "original"

76.0 grains IMR7828 over CCI250 primers under Hornady 225 FBSP Interlock bullets = 2750fps from 24 inch barrels.

The young fellow's rifle really liked this load, and groups went to sub 2 inches at 100yds. He's going to play with seating depth a bit as he still has about .075 of space left in his mag well. With cup and core bullets, getting the bullets close to the leade, usually improves accuracy. I guess that will depend on how deep the throat is in his rifle.

All of the other powders mentioned worked well, depending on which bullet they were used under.

The IMR7828 was the one powder which worked well with all weights, even with lighter bullets down to 200 grains.
 
You must log in or register to reply here.
Back
Top Bottom