N570 powder

[ARlife4me]

Thanks for the info guys .I may try the n570 and might try the n565 i have a 28 inch barrel

568 runs closer to 570 speeds ~30fps than 565 does with more case fill. 568 is a little slower burning, but provides more fill. 565 would be a better choice over 560 as case fill advantage, but will lose ~30-50fps if velocity matters.

if i can get top velocity and accuracy, why not!

 

[6.5x300 WBY]

I also have a 338 378 interested to know how it does

What have you loaded in your 338-378?

I have
300gr Berger
285gr ELDM's
267gr HHT
230gr ELDX's

Right now since this is a relatively new cartridge for me i am working with Retumbo and 267gr HHT. I'm at 3150 fps. It seems with this powder it's a good top load. Just need to work the seating depth for accuracy. Might also Try N570 with it. Possibly US869.

Thinking of trying / Buying LRT.

 

[JamesWilson5]

What have you loaded in your 338-378?

I have
300gr Berger
285gr ELDM's
267gr HHT
230gr ELDX's

Right now since this is a relatively new cartridge for me i am working with Retumbo and 267gr HHT. I'm at 3150 fps. It seems with this powder it's a good top load. Just need to work the seating depth for accuracy. Might also Try N570 with it. Possibly US869.

Thinking of trying / Buying LRT.

I loaded the 270 grain eldx

 

[Mike Matteson]

I have a 338 Allen Xpress (imp. 338 Lapua). My best load and velocity was with RL 33. Velocity with 300 gr. Berger's was right around 2,950 fps with a 26" barrel. Don't get too worked up over velocity - especially at the muzzle. You will find the all the big 338 cartridges tend to shoot within a 150 fps of each other. If you create a ballistic drop chart for the various competing cartiridges, you will find that the difference in velocity downrange varies only by 30-50-fps at long range distances. Not enough to worry about. Base your choice on availability of components, ease of reloading, what fits best into your rifle, etc. It's hard to go wrong with any of the big 338's.

50 fps makes as much as 14" difference at a 1000yds.

 

[JamesWilson5]

Im trying to get max velocity but safely i got just factory barrel on 338-378 but a 28 and 30 inch barrel on my 338 rums

 

[Shane Lindsey]

26" 338 Lapua
90.8gr N570 w/ 300 Berger
Peterson Brass
Fed215
2800 FPS

 

[skipglo]

I have a 338lm and I'm waiting to try these powders i have on hand for 265-300grs

570
568
LRT
33

Also going to try 570 in 300wm & 264wm

33 was specifically developed for the 338 lm. But as scarce as plutonium! Unless you have an 8 lb jug you'd be wasting your time ....but I guess... what else would you do with it?

 

[azsugarbear]

To my mind, 50 fps is statistically meaningless at 1,000 yds. Here's how I look at it. When shooting long distance (typically defined as 1,000+ yds), we dial up for our shots. Gravity is a constant, so for slower bullets we simply dial another MOA or two. No big deal. However, it is the wind and not gravity that gets us into trouble at longer ranges.

Assumption: 300 gr. Berger, shot at 7,000' elevation, 49 degrees and 10 mph wind.
2,950 fps muzzle velocity yields a wind call of 3.05 MOA and 2,133 fps at 1k yds.
2,800 fps muzzle velocity yields a wind call of 3.3 0 MOA and 2,008 fps at 1k yds.

Out west, the winds are rarely constant in terms of speed and direction, so most shooters end up dialing for elevation (gravity/air density), but holding for the wind in order to make last second adjustments depending on what the wind is doing at the moment of the shot. The 0.3 MOA difference between the two muzzle velocities is almost impossible to compensate for with most reticles when holding for wind. In the end, we just add it to our fudge factor.

The only other criteria I look at when analyzing ballistic data is the down rang velocity to ensure the bullet still has enough speed to open properly and perform as it should. For Berger's, that tends to be minimum of 1,800 fps. Given the same bullet, both velocities mentioned above provide admirable wind deflection and down range speed to ensure optimim bullet performance. That is my reasoning behind the statement that 150 fps muzzle velocity variance doesn't really matter much.

 

[Get_Saum]

My 338 Lapua improved has a 26" Proof barrel. Currently shooting Lapua brass, Hornady 285 eldms @ 3045 with 103.5 grs of N570, cci 250

 

[JamesWilson5]

Good velocity

 

[ARlife4me]

33 was specifically developed for the 338 lm. But as scarce as plutonium! Unless you have an 8 lb jug you'd be wasting your time ....but I guess... what else would you do with it?

I bought an 8#er from a member on here and I haven't had time to use any. LRT was developed for 338lm also. From the supply I have I'll be limited to 560-800 rounds and less after load development. Possible uses I'm looking at is for 264wm, 300wm and 338lm. I need to decide on which 1?

 

[LongBomber]

50 fps makes as much as 14" difference at a 1000yds.

I don't see 50 fps between cartridges as a large advantage. I would pick something with the most consistent brass available over going to a larger case with that small of a gain.

50fps extreme spread in the loads from one rifle would be huge I agree, 14" vertical is a killer for making long distance hits.

 

[Shane Lindsey]

I bought an 8#er from a member on here and I haven't had time to use any. LRT was developed for 338lm also. From the supply I have I'll be limited to 560-800 rounds and less after load development. Possible uses I'm looking at is for 264wm, 300wm and 338lm. I need to decide on which 1?

I saw about 100 FPS difference with a 300wm/215s from H1000 to N570.