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The Basics, Starting Out
Rifle build
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<blockquote data-quote="Fiftydriver" data-source="post: 75000" data-attributes="member: 10"><p>Jrdoty,</p><p></p><p>Barrel changes really depend on whats need to set up headspace. Some barrels will bolt on as is and for those generally $20. If the headspace is long on the new barrel it is a simply task to take a bit off the barrel shoulder to bring headspace into spec, for this $50.</p><p></p><p>If the headspace is short, significantly short where truing up the bolt lugs and botl face will not bring a barrel into headspace spec and the chamber must be lengthened then yes it would run in the $150 to $175 range.</p><p></p><p>My 7mm Allen Mag is based on a full length 338 Lapua case with the Allen Mag shoulder configuration and min body taper. For comparision, my 270 Allen Mag based on the 7mm RUM case has a case capacity filled to the mouth with WC872 of 124 gr. We are predicting the 7mm Allen Mag will be at least 135 gr capacity with basically the same neck length and volume so it will be a +10 gr capacity increase. </p><p></p><p>Also, the shorter case length of the 7mm Allen Mag will allow the long ULD bullets to be seated out of the powder capacity much more then the 270 Allen Mag offering an even greater usage of the cases capacity.</p><p></p><p>Another advantage is the strength of the Lapua case. This case will handle higher loading pressures then the RUM case and as such will have an even greater velocity and performance advantage then the case capacity would have you believe.</p><p></p><p>This is not to say the 270 AM is not a great round. It is a fantastic round, the 7mm AM will just be different in a couple ways and as such will also be a bit more expensive to build. especially in a repeating form.</p><p></p><p>Redding is already in the process of building the Full Length sizing dies and I will be furnishing the BR in-line seating dies chambered with the same reamers used in the rifles.</p><p></p><p>We are predicting 3200 fps with the 200 gr ULD in a 30" 1-7 twist 3 groove Lilja barrel. This with a B.C. in the very high .9 range should result in some amazing ballistic numbers.</p><p></p><p>The best thing is that the 200 gr ULD RBBT as well as the lighter 175 gr version are built on a tapered jacket designed for use on medium big game at any range.</p><p></p><p>I am hoping to take a couple days this weekend and get my 7mm Allen Mag test rifle built and on the range so I can report on this new hot rod 7mm. We are looking to top the Lazzeroni 7.21 Firebird by at least 100 fps in velocity with all bullet weights. We also hope to get 3900 fps with a 140 gr Bonded Wildcat or Accubond for those that want the ultimate 600 yard pronghorn rifle with lazer flat trajectory!! We will see what happens.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 75000, member: 10"] Jrdoty, Barrel changes really depend on whats need to set up headspace. Some barrels will bolt on as is and for those generally $20. If the headspace is long on the new barrel it is a simply task to take a bit off the barrel shoulder to bring headspace into spec, for this $50. If the headspace is short, significantly short where truing up the bolt lugs and botl face will not bring a barrel into headspace spec and the chamber must be lengthened then yes it would run in the $150 to $175 range. My 7mm Allen Mag is based on a full length 338 Lapua case with the Allen Mag shoulder configuration and min body taper. For comparision, my 270 Allen Mag based on the 7mm RUM case has a case capacity filled to the mouth with WC872 of 124 gr. We are predicting the 7mm Allen Mag will be at least 135 gr capacity with basically the same neck length and volume so it will be a +10 gr capacity increase. Also, the shorter case length of the 7mm Allen Mag will allow the long ULD bullets to be seated out of the powder capacity much more then the 270 Allen Mag offering an even greater usage of the cases capacity. Another advantage is the strength of the Lapua case. This case will handle higher loading pressures then the RUM case and as such will have an even greater velocity and performance advantage then the case capacity would have you believe. This is not to say the 270 AM is not a great round. It is a fantastic round, the 7mm AM will just be different in a couple ways and as such will also be a bit more expensive to build. especially in a repeating form. Redding is already in the process of building the Full Length sizing dies and I will be furnishing the BR in-line seating dies chambered with the same reamers used in the rifles. We are predicting 3200 fps with the 200 gr ULD in a 30" 1-7 twist 3 groove Lilja barrel. This with a B.C. in the very high .9 range should result in some amazing ballistic numbers. The best thing is that the 200 gr ULD RBBT as well as the lighter 175 gr version are built on a tapered jacket designed for use on medium big game at any range. I am hoping to take a couple days this weekend and get my 7mm Allen Mag test rifle built and on the range so I can report on this new hot rod 7mm. We are looking to top the Lazzeroni 7.21 Firebird by at least 100 fps in velocity with all bullet weights. We also hope to get 3900 fps with a 140 gr Bonded Wildcat or Accubond for those that want the ultimate 600 yard pronghorn rifle with lazer flat trajectory!! We will see what happens. Good Shooting!! Kirby Allen(50) [/QUOTE]
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