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Question for FIFTY (Kirby Allen)????
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<blockquote data-quote="Fiftydriver" data-source="post: 110304" data-attributes="member: 10"><p>Would just like to make one correction to your post. The actual BC of the 142 gr ULD RBBT in 25 cal is more on lines with 0.700.</p><p></p><p>With this number the two Allen Mags, 257 and 270 loaded with the 142 and 169.5 gr ULD RBBTs are pretty much ballistic twins.</p><p></p><p>It is true the 156 gr ULD RBBT has a higher BC then the 169.5 gr ULD RBBT 270 bullet but in my testing it will top out around 3300 fps with a comfortable load compared to nearly 3400 fps or a bit more in some cases with the 270 AM.</p><p></p><p>This is all besides the point anyway, I do not recommend either one of these for any type of varmint hunting use. They can certainly be used for that but the user must realize that barrel life is limited anyway and when used in such a role either will be very hard on a barrel.</p><p></p><p>As a big game rifle they will last many many seasons and in most cases a lifetime of serious big game hunting.</p><p></p><p>They are both extreme performance rounds. The 270 has the dramatic advantage in user friendliness as far as case forming and loading. The 257 AM is on the very top of the 25 cal performance pile and as such is a very extreme and sometimes finicky round with special limitations in powders that can be used to load her.</p><p></p><p>Just wanted to offer my opinion between the comparision.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 110304, member: 10"] Would just like to make one correction to your post. The actual BC of the 142 gr ULD RBBT in 25 cal is more on lines with 0.700. With this number the two Allen Mags, 257 and 270 loaded with the 142 and 169.5 gr ULD RBBTs are pretty much ballistic twins. It is true the 156 gr ULD RBBT has a higher BC then the 169.5 gr ULD RBBT 270 bullet but in my testing it will top out around 3300 fps with a comfortable load compared to nearly 3400 fps or a bit more in some cases with the 270 AM. This is all besides the point anyway, I do not recommend either one of these for any type of varmint hunting use. They can certainly be used for that but the user must realize that barrel life is limited anyway and when used in such a role either will be very hard on a barrel. As a big game rifle they will last many many seasons and in most cases a lifetime of serious big game hunting. They are both extreme performance rounds. The 270 has the dramatic advantage in user friendliness as far as case forming and loading. The 257 AM is on the very top of the 25 cal performance pile and as such is a very extreme and sometimes finicky round with special limitations in powders that can be used to load her. Just wanted to offer my opinion between the comparision. Kirby Allen(50) [/QUOTE]
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