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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.270 AM or 7mm AM
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<blockquote data-quote="Fiftydriver" data-source="post: 171092" data-attributes="member: 10"><p>Yes the 195 gr ULD RBBT will tighten up the spread a bit comparing the 270 AM with the 7mm AM but we have found some issues with the 195 gr pills in the 1-8 3 groove barrels designed for the 270 AM.</p><p> </p><p>Main thing is that the jackets on the 169.5 gr are much heavier then the J-4s used on the 195 so when the barrels get a bit of wear on them, they start to be pretty hard on these bullets, do not seem to have any problems with the heavier jacketed 169.5s however.</p><p> </p><p>As such, I recommend the 169.5s as the primary bullet for the 270 AM.</p><p> </p><p>That said, when they work, they are most impressive in that chambering.</p><p> </p><p>To be honest, when both are loaded to comfortable top end pressures for each case design, the 7mm AM will offer 100 fps more velocity then the 270 AM with that bullet weight class, not much but still 100 fps.</p><p> </p><p>Splitting hairs, just get one of either the 270 or 7mm and then a 338 AM for serious work!!! I am sure you would agree!!</p><p> </p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 171092, member: 10"] Yes the 195 gr ULD RBBT will tighten up the spread a bit comparing the 270 AM with the 7mm AM but we have found some issues with the 195 gr pills in the 1-8 3 groove barrels designed for the 270 AM. Main thing is that the jackets on the 169.5 gr are much heavier then the J-4s used on the 195 so when the barrels get a bit of wear on them, they start to be pretty hard on these bullets, do not seem to have any problems with the heavier jacketed 169.5s however. As such, I recommend the 169.5s as the primary bullet for the 270 AM. That said, when they work, they are most impressive in that chambering. To be honest, when both are loaded to comfortable top end pressures for each case design, the 7mm AM will offer 100 fps more velocity then the 270 AM with that bullet weight class, not much but still 100 fps. Splitting hairs, just get one of either the 270 or 7mm and then a 338 AM for serious work!!! I am sure you would agree!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.270 AM or 7mm AM
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