Guess I was wrong about speeds with using RE17 in my 6 Creed, results inside.

[JGorski]

Took my new chronograph out today and tested 2 different powders in my 6 Creed, RE17 & H4350, got some pretty decent groups, mild to no wind helped that, I'm sure. All these groups were shot at 300yds.
1st load was 41.2grs RE17, AV 3122fps, SD 29 group size-.914"
2nd load was 41.4grs RE17, AV 3125fps, SD 9 group size .914", but that was 4 shots.
4th load was 41.5grs H4350, AV 3104, SD 13, group size 1.120"
5th load was 41.9grs H4350, AV 3136fps, SD 9, group size 1.142", with 4 of the 5 going .402"
7th & 8th are the same as 5th load and can be seen on the same target, loaded those 10 shots at the range as verifying test loads, unfortunately they werent as accurate as that 4 shot group in the original 41.9grs H4350. 3rd & 6th groups were left out cuz they didnt cut the mustard.
Any thoughts where I should proceed from here? My thoughts are to try 41.3grs RE17 & load more of the 41.5grs H4350, please gimme your thoughts.

 

[ddavis]

Looks like velocities are pretty similar. I'd do what I could to make the H4350 work for me, as it will be less temp sensitive. I'm sold on Hodgdon's Extreme line of powders. I had bad luck with temp changes and Reloder powder.

 

[turbo54]

You mean trajectory from 100-300 of a high speed, relatively low drag bullet isn't sufficient to back-calculate velocity?

 

[JGorski]

You mean trajectory from 100-300 of a high speed, relatively low drag bullet isn't sufficient to back-calculate velocity?

Pretty much.