.458 bulging Starline

[laowho]

Thanks Kurt, I pre-poured OE FF @ 68 gr, 69 gr and 70 gr with .060 wads, and compressed .15" Here's what I know now. The distance from chamber to lands is 1/8". On these particular bullets there are 2 profiles: a RN 415 gr that requires 1/2" depth seat to chamber, and; a Postell type 500 gr that requires 9/16" to seat (according to their particular front driving bands). To adequately seat the RN in the 68 gr load I would have to further compress the powder 1/8" for a total compression of 3/16" or .18"--still well w/i the lesser compression that OE is said to prefer. However, for the 69 gr and 70 gr loads afraid the required compression would be too great. But NB, I've read that OE prefers 68 gr. I will however endeavor to compress the 69 gr for the RN at least--should max out at about .30"

Thanks for yer help. It's pretty neat gettin to know the components. But say, would the finer granule powder help here? Just that I've read that FF is specifically for rifle loads, but know I've seen people usin 1.5F. Cheers, Doug