.431 Jacketed Bullets in .4295 Throats -- Problem??

[paul105]

David,

Lateral difference on 25 yd target group above -- I adjusted windage (don't remember if 3 or 4 clicks left) after 240gr JFP Zero and before shooting 260gr WFNGC.


Shot the following targets today at 50 yards. Rested on my range bag. All shots felt good.

240gr Zero JSP (.431), 23.5gr H110, Fed 155 Mag Match, New Top Brass



240gr Hornady XTP (.430), 23.5gr H110, Fed 155 Mag Match, New Top Brass



260gr WFNGC (.432) Mt Bul Works, 23.0gr H110, Fed 155 Mag Match, New Top Brass




Paul

[paul105]

Quick update FWIW:

Ordered a lee .429 push thru, cast bullet sizer die and ran the .431 zeros thru it. Not much resistance and the bullets come out exactly .430 on my Mitutoyo digital micrometer. They are a "snug" fit (bases fit but can't be pushed thru from the front of the cyl) in the M69s throats You can do a bunch of these in short order. Note that Hornady’s XTPs are .430 so the resized Zero’s should be good to go for anyone with concerns.

Tried these .430 Zeros over 9.0gr of Hodgdon Universal. Max load on Hodgdon’s online data is 10.2gr with 240gr Nosler Jacketed, so the usual cautions are in order. Shot very well in the 2 ¾” M69 at 25 yds rested over my range bag. The one (xed out) on the lower right was my bad. Didn’t chrono or compare to .431s. Just a guess, but these are probably running around 950 fps +- in the 2 ¾” bbl.