For those of you who remember, I posted a while back regarding my GAP M2008 .338 LM and the loads I developed using RL25 and RL22. Here is my original thread -
http://www.snipershide.com/forum/ubbthre...rue#Post1281417
Since that time I have taken the gun out to 1000 yards numerous times and came to the conclusion that RL25 works for the 250gr Scenars and 300gr SMK, but I was not pleased with the frequent vertical stringing. Before I go on, I will probably continue to use RL25 for my 300SMK's but I'm going with H4831SC for the 250 Scenar's.
Back in October I worked up a load using H4831SC and 250 Scenar's. I started at 90.0gr and worked my way up to 93.5 gr. I did not have any pressure signs in any of the loads used. But during my load development, I noticed this:
H4831SC SHOOTS!
The 90gr load chronied at 2890fps while the 90.5 gr load was going 2910fps and the 91.0 was at 2947fps. Keep in mind that these eight shots were done in a row. The only reason the 90.5 and 91 gr shots are higher is due to the fact I adjusted the scope up 1 MOA.
I took this load out to 1000 yds and noticed the vertical was just about eliminated.
I bought 8 pounds of H4831SC and recently verified that 91.0gr is good for that batch also. I did notice that the new lot of H4831SC produced a little better velocities, and the groups were still very good.
I'm also pleased with how consistent the velocities are (I know...you can't determine ES and SD from only three shots).
The reason for posting this is not to say, "Look at my groups" but rather that H4831SC is a powder that will work for the 250gr bullets in the .338. Some say that this powder is too fast and they may be right for the gun that they are shooting. But I have found it works very well in my gun.
My next load development will be with Retumbo (which I have already pushed the 300SMK to 2850 without pressure signs) and H1000 for the 300SMK's.
http://www.snipershide.com/forum/ubbthre...rue#Post1281417
Since that time I have taken the gun out to 1000 yards numerous times and came to the conclusion that RL25 works for the 250gr Scenars and 300gr SMK, but I was not pleased with the frequent vertical stringing. Before I go on, I will probably continue to use RL25 for my 300SMK's but I'm going with H4831SC for the 250 Scenar's.
Back in October I worked up a load using H4831SC and 250 Scenar's. I started at 90.0gr and worked my way up to 93.5 gr. I did not have any pressure signs in any of the loads used. But during my load development, I noticed this:
H4831SC SHOOTS!
The 90gr load chronied at 2890fps while the 90.5 gr load was going 2910fps and the 91.0 was at 2947fps. Keep in mind that these eight shots were done in a row. The only reason the 90.5 and 91 gr shots are higher is due to the fact I adjusted the scope up 1 MOA.
I took this load out to 1000 yds and noticed the vertical was just about eliminated.
I bought 8 pounds of H4831SC and recently verified that 91.0gr is good for that batch also. I did notice that the new lot of H4831SC produced a little better velocities, and the groups were still very good.
I'm also pleased with how consistent the velocities are (I know...you can't determine ES and SD from only three shots).
The reason for posting this is not to say, "Look at my groups" but rather that H4831SC is a powder that will work for the 250gr bullets in the .338. Some say that this powder is too fast and they may be right for the gun that they are shooting. But I have found it works very well in my gun.
My next load development will be with Retumbo (which I have already pushed the 300SMK to 2850 without pressure signs) and H1000 for the 300SMK's.
