rutilate Posted November 23, 2014 Share Posted November 23, 2014 I've just run out of 230gr X-Treme bullets and am moving over to Rainier--but my new chronograph hasn't yet arrived and I can't verify the velocity in the new bullets. It looks like the X-Treme bullets are .452, and the same weight Rainier are .451. Given the slightly smaller diameter, resistance will be somewhat lower through the barrel, increasing velocity by how much? Should I increase the powder charge by .1? I'm currently dropping 4.6 gr Titegroup. My present COAL=1.260, and I'll verify and adjust for profile changes. Link to comment Share on other sites More sharing options...
Dirty Rod Posted November 23, 2014 Share Posted November 23, 2014 (edited) I don't see any measurable difference in velocity moving from .452 to .451 bullets. My guns don't particularly like X-Treme bullets but I do run plenty of Berrys, MG, PD, Ranier, etc all with the same charge for 230gr RN bullets. Edited November 23, 2014 by Dirty Rod Link to comment Share on other sites More sharing options...
rutilate Posted November 24, 2014 Author Share Posted November 24, 2014 Thanks, Dirty Rod. My chronograph has been on backorder since May, and having recently relocated to the Pacific Northwest, it seems to be always raining here and hard to coordinate a time to chronograph, otherwise I'd just test it myself. Link to comment Share on other sites More sharing options...
grouptherapy Posted January 2, 2015 Share Posted January 2, 2015 Wow. My chrono came in 3 days from eBay in feb. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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