• If you are being asked to change your password, and unsure how to do it, follow these instructions. Click here

300 win mag N570

I know right! It makes this 300 win mag close to 300 rum velocities... According to the VV app, they recommend starting at 77.8 and max at 81.8 for Lapua Scenar-L 220 grain bullets with 2566 to 2753 FPS but that was from a 24.5" test barrel.
 
just a small point of order.
you shot 3 shot GROUPS, you did not shot a ladder.
groups in steps, ladder is SINGLE shots in steps
i have 2 300's currently doing well on rl26, but will try 570
 
Alliant's website list RL-23's description as using "TZ® technology provides exceptionally consistent velocities across temperature extremes" but RL-26 as
"Controlled temperature stability". Not sure that means the same thing or just marketing hype.
 
just a small point of order.
you shot 3 shot GROUPS, you did not shot a ladder.
groups in steps, ladder is SINGLE shots in steps
i have 2 300's currently doing well on rl26, but will try 570

I shot a ladder previously to determine velocities and look for max pressure. I really needed more yardage for ladder. See below:
F50A717A-5CBB-4D74-8327-3B5ED71CA679.jpeg
 
so the load development kinda goes like this:
LADDER...find a node or 2 plus max
3 shot GROUPS eval the nodes from above
5 shot GROUPS proof the 3 shot data from above
TUNE adjust oal and small powder charge changes for the "best".
retest at temp and elevation where use is expected

5
I shot a ladder previously to determine velocities and look for max pressure. I really needed more yardage for ladder. See below:
View attachment 136020
 
Yeah pretty close... I try to do 3 shot groups at 0.1 grain increments after verifying node with .5 grain jump. That will let me know high and low end of node. Pick the powder charge in middle of node. Then do seating test adjustment to finalize the load.
 
In order to fine tune my powder charge, I loaded 3 rounds each from 78.5 to 79 in 0.1 grain increments.

If I could shoot better and not pull one every now and then, it would be better... overall I like 78.8 due to chrono results and groups. Also the 78.8 poi is about the same as 78.7 and 78.9.

4b2a329094873708443761295b1abbf3.jpg


91a6df7b86cd5c4930c4dac6ff7e1fca.jpg


ae416ada0976132ee1d734b82d96bd64.jpg


3fbd8c57d402d9ea6e5dd7e2dfcd4a99.jpg


15e9e77c2c820126ac1006223a69f850.jpg


8d857a3ed19f1c03a2a53dc8b3cd5185.jpg
 
Thanks. I'm still amazed at the velocity. My Rum with 8 more grains of powder is getting the same velocity but with the 230 Bergers. The 300 win mag load is smoking and has no pressure sign.
 
Alliant's website list RL-23's description as using "TZ® technology provides exceptionally consistent velocities across temperature extremes" but RL-26 as
"Controlled temperature stability". Not sure that means the same thing or just marketing hype.
RL26 is not a temp stable powder.
 
Danny, I hear what you keep saying. Saying it and sharing a post from 24hourcampfire doesn't make it true. I use it and have my own opinion of it, as others on here do. I think I know your opinion of it but do you have any experiences with it you'd like to share?
 
Warning! This thread is more than 4 years ago old.
It's likely that no further discussion is required, in which case we recommend starting a new thread. If however you feel your response is required you can still do so.
Top