300wm / Starting Charge weight

[Deleted member 107666]

I know the book says 72....

Have yet to find/see data from anyone who's had pressure (or a node) down near 74 grains of H1000 shooting berger 215s.


I fire formed with 73gr, H1000 and Berger 215s, loaded at 2.781 CBTO (.020 OTL) No pressure signs, grouped about barely sub MOA to .6 moa throughout seating depth test.


Seeing nobody ever posts a node or pressure signs that early, can I jump up to 74.5 or 74.8 to start?


Seems to be the recipe for 215s is about 76-76.5 gr of H1000 or so at .020 OTL...


Just trying to save time, am i risking anything not starting at 73.3 or 73.5?


Lastly...with 300wm, am I wasting brass doing the initial workup at .3 gr increments? Should I go .5 gr increments to find the node and fine tune from there with .2 or .3 increments?


Thanks all.

 

[MagnumManiac]

I run 78gr with 215's.
The node is wide, a full 2gr above/ below 77gr in 2 of my rifles, the other likes a different powder.
I can drop .3gr and have no change in group size, or go up .3gr and have pressure with 78.3gr and group size stays stable.
These are NOT factory barrels, they have A-191 chambers.
I fine tune with. 3gr increments and work up with .5gr increments.
The only time I use .2gr ibcrements is if the case is smaller than 22-250/Creed dimensions.

Cheers.