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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
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<blockquote data-quote="Black Diamond 408" data-source="post: 111574" data-attributes="member: 1563"><p>Goodgrouper;</p><p></p><p>Well the only powder i havent tried yet is the VV20N29 cannon powder, I think Kirby is going to try it in his monster. US869 works if you run the pressures up to top.</p><p>BMG50 powder is cleaner at 145 on up, I think Kirby is at 149 in his 338AM. The WC872 i have just started load development, 145.5 is a starting load i tried yesterday. I will bump up some incrementel loads to 150 and see where the pressures top out. I suspect it will be cleaner burning at higher pressures.</p><p></p><p>US869 </p><p>142grns 3250fps</p><p>144grns 3365fps</p><p>147grns 3495fps</p><p></p><p>HBMG50 </p><p>142grns 3350fps - fireforming load - 98% case form</p><p>147grns 3505fps</p><p></p><p>WC872</p><p>142grns 3200fps</p><p>146grns 3400fps</p><p>150grns ? not tested yet</p><p></p><p>These tests are from my original gun, not the carbon fiber bbl. There was some pressure signs at the top loads, then found out my neck was a little tight, shaved off .002 and all was fine. 3350-3495 is the operating range for this particular rifle.</p><p></p><p>My case is just a bit smaller than Kirby's 338AM, i can fill the case with US869 and WC872 for top loads, BMG50 there is a little room left but the load has topped out pressure wise.</p><p></p><p>This is new territory, takes a while to get all the powders checked out. /ubbthreads/images/graemlins/grin.gif</p><p></p><p>From trigger pull to 500yard hit, less than 1/2 second with 300grn pill! .4783 of a sec to be exact.</p><p></p><p> 1 second to 1000yds.</p><p>1.7 seconds to 1500yds</p><p>2.69 seconds to 2000yds</p><p></p><p>all at 3450fps bullet speed and 300MK bullet 1200ft elevation.</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="Black Diamond 408, post: 111574, member: 1563"] Goodgrouper; Well the only powder i havent tried yet is the VV20N29 cannon powder, I think Kirby is going to try it in his monster. US869 works if you run the pressures up to top. BMG50 powder is cleaner at 145 on up, I think Kirby is at 149 in his 338AM. The WC872 i have just started load development, 145.5 is a starting load i tried yesterday. I will bump up some incrementel loads to 150 and see where the pressures top out. I suspect it will be cleaner burning at higher pressures. US869 142grns 3250fps 144grns 3365fps 147grns 3495fps HBMG50 142grns 3350fps - fireforming load - 98% case form 147grns 3505fps WC872 142grns 3200fps 146grns 3400fps 150grns ? not tested yet These tests are from my original gun, not the carbon fiber bbl. There was some pressure signs at the top loads, then found out my neck was a little tight, shaved off .002 and all was fine. 3350-3495 is the operating range for this particular rifle. My case is just a bit smaller than Kirby's 338AM, i can fill the case with US869 and WC872 for top loads, BMG50 there is a little room left but the load has topped out pressure wise. This is new territory, takes a while to get all the powders checked out. [img]/ubbthreads/images/graemlins/grin.gif[/img] From trigger pull to 500yard hit, less than 1/2 second with 300grn pill! .4783 of a sec to be exact. 1 second to 1000yds. 1.7 seconds to 1500yds 2.69 seconds to 2000yds all at 3450fps bullet speed and 300MK bullet 1200ft elevation. Dave [/QUOTE]
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Testing two rifles, identical chambers ...different barrels
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