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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
3 groove Barrels
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<blockquote data-quote="J E Custom" data-source="post: 256538" data-attributes="member: 2736"><p>Well I promised that I would update everyone on this biuld and finally got to do some</p><p>testing today.</p><p></p><p>I started with the 60gr bullets to see if they would stabilize because the 1 in 15 twist</p><p>is recomended for 55gr to 40gr and I wanted to find the upper limmits in bullet weight.</p><p></p><p>The 3 groove barrel performed very good and appears not to foul bad like Kirby said.</p><p></p><p>Group size was not that good ( Just under 1 MOA ) .921 but velocity for the 60gr bullet</p><p>was = 3917,3921 and 3910 ft/sec with a SD of 0006 and avg 3915 ft/sec.</p><p></p><p>Velocity was over 100 ft/sec faster than my listed load and I'm assuming that the barrel</p><p>has a lot to do with that.</p><p></p><p>The load was hot and bolt lift was stiff but signs of pressure were not bad.</p><p></p><p>Now I will load the lighter bullets ( 40gr,45gr,50gr and 55gr ) to find out what it likes.</p><p></p><p>If the velocity increase holds up I should be able to reach 4500 ft/sec with the 40gr </p><p>ballistic tip ( Don't know why I would want to ,but it is an experimental rifle so I will</p><p>try).</p><p></p><p>When I get the accuracy that I want I will post pictures of the rifle and targets with</p><p>the load and performance data.</p><p></p><p>These velocitys were measured on a oehler 35p crony and are not dangerous but I will load</p><p>down about 1gr once I reach the pucker factor on each load .</p><p></p><p>Just an update if anyone is interested</p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 256538, member: 2736"] Well I promised that I would update everyone on this biuld and finally got to do some testing today. I started with the 60gr bullets to see if they would stabilize because the 1 in 15 twist is recomended for 55gr to 40gr and I wanted to find the upper limmits in bullet weight. The 3 groove barrel performed very good and appears not to foul bad like Kirby said. Group size was not that good ( Just under 1 MOA ) .921 but velocity for the 60gr bullet was = 3917,3921 and 3910 ft/sec with a SD of 0006 and avg 3915 ft/sec. Velocity was over 100 ft/sec faster than my listed load and I'm assuming that the barrel has a lot to do with that. The load was hot and bolt lift was stiff but signs of pressure were not bad. Now I will load the lighter bullets ( 40gr,45gr,50gr and 55gr ) to find out what it likes. If the velocity increase holds up I should be able to reach 4500 ft/sec with the 40gr ballistic tip ( Don't know why I would want to ,but it is an experimental rifle so I will try). When I get the accuracy that I want I will post pictures of the rifle and targets with the load and performance data. These velocitys were measured on a oehler 35p crony and are not dangerous but I will load down about 1gr once I reach the pucker factor on each load . Just an update if anyone is interested J E CUSTOM [/QUOTE]
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3 groove Barrels
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