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Hi all,
I'm shooting a Contender with a SSK 10" bull barrel (1:8 twist) primarily using subsonic loadings with Sierra 220 gr and 240 gr MatchKings. Brass is Rem 221 Fireball, primers are Federal, and dies are Hornady. I originally got into the 300 whisper for the sole purpose of using it to develop suppressors (I’m a part time gunsmith and Class II manufacturer). However it is such a pleasure to shoot and the accuracy is so impressive, I wish I would have bought it a long. Most of the loads I’m shooting were developed using Quick Load and, so far, the most accurate has been Vit 3N37 with a Sierra 220 gr MK at around 1000 FPS (this load yields a load density of around 61%). The extreme velocity spread for this load has been around 12-15 FPS and group size has been around 3/8” to 1/2” at 50 yards (I currently have an Aimpoint M2 1X with a 4 moa dot which hampers accuracy testing at much beyond 50 yards). Another powder that has tested well so far has been Alliant Herco with the same bullet (load density is around 81% and extreme spreads around 10-15 FPS).
I now have 300 Whisper reamers in house and the next project will be a suppressed version built on a Rem 700 SA platform. I’m glad to know there’s finally a place for the Whisper crowd to hang out.
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