Something to share

[bruce moulds]

kurt,
thank you for sharing this.
chris,
the fourth prolate does certainly look the best in the photos.
the 50 cal greaser makes me rest my case with bore riding noses being potential sources of lead in bpcr barrels as opposed to smokeless.
bullet no 6 from the left seems to have bumped up the most in the base area, while bullet no 11 looks to have more bumpup 1/2 way along the shank.
the latter is what I would have expected more than the former.
just goes to show the benefits of this kind of testing.
I have never really had bumpup problems when using just a 0.030 or 0.060 wad only with fixed ammo, but I have never had access to snow either.
I think that a thinner harder wad transmits the shock of the powder better than softer wads in combination with lube wads, causing a more sudden bumpup and a quicker seal in the bore.
the creedmoor shooters preferred just a thin "pasteboard" wad or even one of drafting paper, and this could be what allowed the use of the harder alloys they used.
of course this precluded shooting dirty.
keep safe,
bruce.