Load thoughts...

[300BLK]

Has anyone run WW 748 through GRT?  Data that I looked at suggested higher velocity with 748 than Staball Match, but not as much as AA 2520.
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So I finally got my hands on some N140 and made a preliminary model for my 20" gas gun. It is just a blank slate that I filled with my numbers and as of now un-tested to confirm. 

1) I simply replaced the N140 for W748 and this is what it produced.

2) W748 is not well represented in GRT powder, meaning there are not a lot of submissions to "fine tune" the powder character.

Caveat lector

Hodgdon shows  27.4gr charge under the 107gr SBT and 2.26 OAL @ 2623fps and 51,500 PSI, so a gas gun load.    Boltguns will take a longer OAL and more powder.