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G'day from Australia,
I am currently load testing a 300 Whisper for a friend. It's a MAB (Australia) single shot bolt action. 30" Heavy S/S MAB barrel, 1/8 Twist. Big gun! Only just started loads last week. Way too sub sonic! Dont need a supressor when your making less noise than a .22. Getting consistant results is a whole different issue.
Also been testing a Jongmans single shot bolt action with a 15" S/S, 1/8 twist barrel. Have a 155grn Hornady A-Max load at super sonic getting 1/4 to 1/2" groups. 220grn Sierra HPBT Match getting 1/2" but just over sub sonic. Have tried 240grn pills but can't get stabilization at 100 yards. Boy do those have some torque!
Would be great to hear from some of you guys that hunt with this caliber and if anyone has any advise on this cal with long barrels.
Cheers,
caithness77
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