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Message: <blockquote data-quote="Hangfire" data-source="post: 3365601" data-attributes="member: 27673">I've had a 14" Contender barrel, a 15" Encore barrel and a Remington XP-100 rebarreled to 300 Whisper for IHMSA silhouette competitions and they were real tack drivers and they all three liked the same load.Fire formed 221 Fireball brass.Remington 7 1/2BR primers.Sierra 168 gr. HPBT Matchking bullets.18.5 grs. Accurate AA1680.As most here know the 300 Whisper, 300 BO and 300-221 are all three pretty much the same round but since JD Jones of SSK invented and patented the 300 Whisper cartridge the cartridge name and case dimensions had to be changed very slightly to keep from stepping on JD's toes.For Contender and Encore barrels, frames, handgun scopes etc. contact Ed Kirkpatrick in OKC, his web site is not up to date and he's not real good about returning calls or emails so just keep calling (day or evenings) till he actually answers the phone.........405-879-0879.</blockquote>