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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm ai too long for savage short action?
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<blockquote data-quote="AZShooter" data-source="post: 1035689" data-attributes="member: 5219"><p>This has been an interesting discussion. There are so many 6mm variants and so little time to try them all. </p><p></p><p>TBRice23:</p><p> You could just use the chambering with the bullet seated deeper than the preferred base to shoulder junction. I wanted my 6mm-284 to be a repeater in a SA model 700. I put in a Wyatt's mag box which helped some but not enough. I seated the 105 berger hybrids to fit and feed and the heck with the bullet anywhere close to rifling. The rifle shoots very accurately with a significant jump to lands. Using RL-33 in the 1 in 7.5 twist 28" 5R Bartlein barrel yields 3425 fps.</p><p></p><p>----------------------</p><p></p><p>Speaking of sending in a reamer short or long......I will soon own a 6 BR. While I will certainly make this chambering I have another one in mind. I will plunge it deeper to headspace as a 243. I did this with a 30 BR reamer and am delighted with the 30 BR/308's performance. I wish I could claim the idea for the 6BR/243 but the gentlemen mentioned in the article below thought of it first. The description is grafting a 6 BR front to a 243 base. I copied this from an article:</p><p></p><p>"Gunsmith Mike Sosenko and long-time AccurateShooter Forum member John Adams have been using a modified .243 Winchester case with great success in Varmint Silhouette matches at the Pala Range in Southern California. Officially called the ".243 BR-K" (and informally dubbed the "6BR Long"), the wildcat is basically a</p><p></p><p> .243 Winchester with less body taper and a 30-degree shoulder.</p><p></p><p> The design essentially grafts a 6mmBR Norma "top end" to the .243 Winchester case. After fire-forming, Mike and John can reload this case using normal, unmodified 6BR neck-sizing and seater dies.</p><p></p><p>Compared to a .243 Winchester, the .243 BR-K's body length is about .006″ longer, and the shoulder is about .0055″ wider. The main difference is the shoulder angle (30° vs. 20°), and the location of the neck-shoulder junction ("NSJ"). Based on reamer prints, the base to NSJ dimension is 1.718″ on the 6BR Long, compared to 1.804″ for the .243 Winchester. Neck length is a bit shorter because "the neck shrinks a little when the shoulder blows out" according to Sosenko. We've provided a mock-up diagram of the .243 BR-K, but you should check with Dave Kiff of Pacific Tool & Gauge for exact dimensions. Dave created the reamers for both the 6mm and 22-caliber versions of this wildcat. Ask for the "22 BR-K" or ".243 BR-K" reamer designs."</p><p></p><p>--------</p><p></p><p>The advantage of both the 30BR/308 and the 6BR/243 is that no custom dies are needed. Just use the BR dies. Both chamberings will require neck turning. I setup the 30 BR for a fitted neck so I don't size the brass after firing. Might do the same with the 6BR/243. For anyone not familiar with this read what Virgil did in the story: "Secrets of the Houston Warehouse" <a href="http://www.angelfire.com/ma3/max357/houston.html" target="_blank">Secrets of the Houston Warehouse</a></p><p></p><p>Just love LRH and the stuff we can learn or share here. </p><p></p><p>Ross</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1035689, member: 5219"] This has been an interesting discussion. There are so many 6mm variants and so little time to try them all. TBRice23: You could just use the chambering with the bullet seated deeper than the preferred base to shoulder junction. I wanted my 6mm-284 to be a repeater in a SA model 700. I put in a Wyatt's mag box which helped some but not enough. I seated the 105 berger hybrids to fit and feed and the heck with the bullet anywhere close to rifling. The rifle shoots very accurately with a significant jump to lands. Using RL-33 in the 1 in 7.5 twist 28" 5R Bartlein barrel yields 3425 fps. ---------------------- Speaking of sending in a reamer short or long......I will soon own a 6 BR. While I will certainly make this chambering I have another one in mind. I will plunge it deeper to headspace as a 243. I did this with a 30 BR reamer and am delighted with the 30 BR/308's performance. I wish I could claim the idea for the 6BR/243 but the gentlemen mentioned in the article below thought of it first. The description is grafting a 6 BR front to a 243 base. I copied this from an article: "Gunsmith Mike Sosenko and long-time AccurateShooter Forum member John Adams have been using a modified .243 Winchester case with great success in Varmint Silhouette matches at the Pala Range in Southern California. Officially called the “.243 BR-K” (and informally dubbed the “6BR Long”), the wildcat is basically a .243 Winchester with less body taper and a 30-degree shoulder. The design essentially grafts a 6mmBR Norma “top end” to the .243 Winchester case. After fire-forming, Mike and John can reload this case using normal, unmodified 6BR neck-sizing and seater dies. Compared to a .243 Winchester, the .243 BR-K’s body length is about .006″ longer, and the shoulder is about .0055″ wider. The main difference is the shoulder angle (30° vs. 20°), and the location of the neck-shoulder junction (“NSJ”). Based on reamer prints, the base to NSJ dimension is 1.718″ on the 6BR Long, compared to 1.804″ for the .243 Winchester. Neck length is a bit shorter because “the neck shrinks a little when the shoulder blows out” according to Sosenko. We’ve provided a mock-up diagram of the .243 BR-K, but you should check with Dave Kiff of Pacific Tool & Gauge for exact dimensions. Dave created the reamers for both the 6mm and 22-caliber versions of this wildcat. Ask for the “22 BR-K” or “.243 BR-K” reamer designs." -------- The advantage of both the 30BR/308 and the 6BR/243 is that no custom dies are needed. Just use the BR dies. Both chamberings will require neck turning. I setup the 30 BR for a fitted neck so I don't size the brass after firing. Might do the same with the 6BR/243. For anyone not familiar with this read what Virgil did in the story: "Secrets of the Houston Warehouse" [url=http://www.angelfire.com/ma3/max357/houston.html]Secrets of the Houston Warehouse[/url] Just love LRH and the stuff we can learn or share here. Ross [/QUOTE]
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6mm ai too long for savage short action?
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