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Long Range Hunting & Shooting
With all the discussion about the relative over bore cartridges
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<blockquote data-quote="J E Custom" data-source="post: 1379814" data-attributes="member: 2736"><p>He attempted to redirect the pressure wave by using the double radius to do this, But in truth, by the time the flame front reaches the shoulder, the problem already exist. His shoulder design did help contain the powder longer and allow for more powder along with other chamber design innovations. More shoulder angle and the elimination of the double radius seams to negate any advantages of his design, and with his free bore philosophy the 40o shoulder and his free bore recommendations appear to be more efficient and able to produce even more velocity with the same pressures.</p><p></p><p>Like many, I experimented with the primer tube to move primary ignition to the front of the case for a "Reverse Burn" to see if there was any accuracy advantage. But I did not shoot this system enough to see if there was any throat erosion benefits.</p><p></p><p>The short fat cartridge design with 30 to 40o shoulder angles seem to be the best compromise for efficiency and consistency. Throat erosion rate is yet to be determined in my opinion. The 7mm STW is one of my favorite cartridges but so far it has consumed the barrel the fastest of any of my rifles. (250 rounds down the barrel) But I must admit I pushed it to the limit of its velocity. I also shot a 7mm Remington mag to its limit and beyond for 1000 yard matches (Some brand of Cases lasted 2 firings, others blew the primers the first shot) The rifle loved velocity and the hotter I loaded it, the better it shot. but it has faired better and now has 400 to 500 rounds down the tube and still shoots great with reduced loads, some throat erosion is present but not bad enough to re barrel it.</p><p></p><p>There are plusses and minuses to many design features and to get the best performances for the need/job, some compromises must be made.</p><p></p><p>Just my opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1379814, member: 2736"] He attempted to redirect the pressure wave by using the double radius to do this, But in truth, by the time the flame front reaches the shoulder, the problem already exist. His shoulder design did help contain the powder longer and allow for more powder along with other chamber design innovations. More shoulder angle and the elimination of the double radius seams to negate any advantages of his design, and with his free bore philosophy the 40o shoulder and his free bore recommendations appear to be more efficient and able to produce even more velocity with the same pressures. Like many, I experimented with the primer tube to move primary ignition to the front of the case for a "Reverse Burn" to see if there was any accuracy advantage. But I did not shoot this system enough to see if there was any throat erosion benefits. The short fat cartridge design with 30 to 40o shoulder angles seem to be the best compromise for efficiency and consistency. Throat erosion rate is yet to be determined in my opinion. The 7mm STW is one of my favorite cartridges but so far it has consumed the barrel the fastest of any of my rifles. (250 rounds down the barrel) But I must admit I pushed it to the limit of its velocity. I also shot a 7mm Remington mag to its limit and beyond for 1000 yard matches (Some brand of Cases lasted 2 firings, others blew the primers the first shot) The rifle loved velocity and the hotter I loaded it, the better it shot. but it has faired better and now has 400 to 500 rounds down the tube and still shoots great with reduced loads, some throat erosion is present but not bad enough to re barrel it. There are plusses and minuses to many design features and to get the best performances for the need/job, some compromises must be made. Just my opinion J E CUSTOM [/QUOTE]
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