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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
200 Grain Wildcat - so far so good
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<blockquote data-quote="Fiftydriver" data-source="post: 76678" data-attributes="member: 10"><p>ss7mm,</p><p></p><p>Well, that is a suprise to me but there are often suprises in this old world. Thats why it pays to test something just to see what happens!!!</p><p></p><p>Only problem now is I have a shop full of work to do but also a bench full of prepped cases for my 7mm (will call it my 7mm to be politically correct as to not offend some) /ubbthreads/images/graemlins/grin.gif</p><p></p><p>The reason we decided to go with the fast 1-7 twist barrels is first of all because the computer models recommended this but also because these will be used as big game bullets and rounds so they need to stabilize in every condition, hot, cold, sea level, 14,000 ft, 2800 fps, 3300 fps, everything. </p><p></p><p>Appearently this is a bit more then we needed but then again reliability is the aspect were after. This is good information though and very interesting.</p><p></p><p>I will be testing these bullets soon in my 1-9 twist barrel on my 7mm and will hopefully get the same results as you. We will see.</p><p></p><p>When I was developing loads for my 257 with the 156 gr ULD RBBT I was using a 1-8 Pac Nor barrel as that was the only fast twist 257 barrel I was aware of at the time. With starting loads there was a noticable nose tear on the bullets at 100 yards until velocity reached 2950 fps and then things seemed to round up as far as the bullet holes went.</p><p></p><p>At 500 yards groups were not that impressive until I got to 3100 fps and then they almost instantly tightened up and continued to do so until I topped out in the high 3300 fps range telling me that while the 1-8 twist will stabilize this bullet at top velocities it is marginal.</p><p></p><p>I do not feel comfortable with a twist rate that only stabilizes bullets at the top end of the velocity spectrum. That said, I have tested this 257 with these 156 gr ULDs out to 1/2 mile and they hold their stability well out to this range.</p><p></p><p>Have not tested them at range in cold weather though.</p><p></p><p>This is the reason I chose the 1-7 for the 257 as well as the 7mm.</p><p></p><p>Still, this is very interesting results!!!</p><p></p><p>See, if you would have asked Richard or myself if this would work we would have said probably not but just proves you need to get some and try them for yourself. Nothing substitutes for good ol fashion range testing.</p><p></p><p>I think I will load some up early this morning, go put in a full day in the shop and then either test them tonight or early inthe morning when its cool.</p><p></p><p>Great report, keep us posted!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 76678, member: 10"] ss7mm, Well, that is a suprise to me but there are often suprises in this old world. Thats why it pays to test something just to see what happens!!! Only problem now is I have a shop full of work to do but also a bench full of prepped cases for my 7mm (will call it my 7mm to be politically correct as to not offend some) [img]/ubbthreads/images/graemlins/grin.gif[/img] The reason we decided to go with the fast 1-7 twist barrels is first of all because the computer models recommended this but also because these will be used as big game bullets and rounds so they need to stabilize in every condition, hot, cold, sea level, 14,000 ft, 2800 fps, 3300 fps, everything. Appearently this is a bit more then we needed but then again reliability is the aspect were after. This is good information though and very interesting. I will be testing these bullets soon in my 1-9 twist barrel on my 7mm and will hopefully get the same results as you. We will see. When I was developing loads for my 257 with the 156 gr ULD RBBT I was using a 1-8 Pac Nor barrel as that was the only fast twist 257 barrel I was aware of at the time. With starting loads there was a noticable nose tear on the bullets at 100 yards until velocity reached 2950 fps and then things seemed to round up as far as the bullet holes went. At 500 yards groups were not that impressive until I got to 3100 fps and then they almost instantly tightened up and continued to do so until I topped out in the high 3300 fps range telling me that while the 1-8 twist will stabilize this bullet at top velocities it is marginal. I do not feel comfortable with a twist rate that only stabilizes bullets at the top end of the velocity spectrum. That said, I have tested this 257 with these 156 gr ULDs out to 1/2 mile and they hold their stability well out to this range. Have not tested them at range in cold weather though. This is the reason I chose the 1-7 for the 257 as well as the 7mm. Still, this is very interesting results!!! See, if you would have asked Richard or myself if this would work we would have said probably not but just proves you need to get some and try them for yourself. Nothing substitutes for good ol fashion range testing. I think I will load some up early this morning, go put in a full day in the shop and then either test them tonight or early inthe morning when its cool. Great report, keep us posted!!! Kirby Allen(50) [/QUOTE]
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200 Grain Wildcat - so far so good
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