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Rifles, Reloading, Optics, Equipment
Reloading
6BR Rem, how to get it correct?
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<blockquote data-quote="Dave King" data-source="post: 95908" data-attributes="member: 3"><p>Some range results, observations and questions.</p><p></p><p></p><p> I shot yesterday trying one load and three different groups of brass.</p><p></p><p> BRASS:</p><p> Set "A" of brass was just prep'd with a ~.2605 neck with a loaded bullet.</p><p> Set "B" was a once fired set of brass of ~.260.</p><p> Set "C" was newly prep'd with ~.261 neck.</p><p></p><p> Load:</p><p> I used 29.0gr of H322, CCI BR4 and Clay Spencer 68gr bullets.</p><p></p><p> Shooting:</p><p></p><p> I used .230 as bullet hole diameter (value to subtract) for calculating group size.</p><p></p><p> I fired one fouler (producing a very small group).</p><p></p><p> <strong>Set "A"</strong></p><p> Group 1: .2605 neck three shots = .159" (.327 tall x .290 wide)</p><p> </p><p> Group 2: .2605 neck three shots = .166" (.335 tall x .368 wide)</p><p></p><p> Group 3: .2605 neck three shots = .247" (.477 tall x .288 wide)</p><p></p><p> Group 4: .2605 neck three shots = .520" (shot by a range visitor) (.750 tall x .546 wide)</p><p></p><p></p><p> </p><p> <strong>Set "B"</strong></p><p> Group 5: .260 neck <strong>five</strong> shots = .428" (shot by a range visitor) (.536 tall x .585 wide) </p><p></p><p> Group 6: .260 neck three shots = .477" (.707 tall x .323 wide) (one round chambered "loose")</p><p></p><p> Group 7: .260 neck <strong>seven</strong> shots = .702" (.865 tall x .634 wide) (there are two fliers and two rounds extracted hard -hot rounds-) The two fliers are high by ~.4"</p><p></p><p> </p><p> <strong>Set "C"</strong></p><p> Group 8: .261 neck <strong>five</strong> shots = .892" (.814 tall x .941 wide)</p><p></p><p></p><p> <strong>Set "A"</strong> again for verification</p><p> </p><p> Group 9: .2605 neck <strong>five</strong> shots = .330". (.561 tall x .546 wide)</p><p></p><p></p><p> I did not clean the rifle between groups.</p><p></p><p> There was some mirage from the barrel (cool day ~55F) but I waited until it was clear before shooting the later groups.</p><p></p><p> I shot from a bipod and sand sock.</p><p></p><p> The scope is a Leupold 6.5 x 20.</p><p></p><p> Distance 100 yards.</p><p></p><p> Wind = ~null</p><p></p><p> Wilson seater OAL = ~2.220 (.020 over stated max length but not touching the lands.) </p><p> </p><p> Neck bushing in resize die = .259"</p><p></p><p> I'm curious as to why some rounds seem hot (extract stiffly as compared to others on the once fired brass).</p><p></p><p> With the case necks so thin (~.009) is there a special method to anneal them?</p><p></p><p> For my 308 brass I use a tub of cold (iced) water, a ~1" blue propane flame and a count of 10 with the tip of the flame touching the middle of the revolving case neck. For these thin necks I'm thinking I'd melt the neck even with a short count.</p><p></p><p></p><p></p><p>Note: The point of impact on groups 1,2,3 and 8 are primarily due to scope adjustments.</p><p></p><p> <img src="http://longrangehunter.com/images/6br-29H322-20Jan2006.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Dave King, post: 95908, member: 3"] Some range results, observations and questions. I shot yesterday trying one load and three different groups of brass. BRASS: Set "A" of brass was just prep'd with a ~.2605 neck with a loaded bullet. Set "B" was a once fired set of brass of ~.260. Set "C" was newly prep'd with ~.261 neck. Load: I used 29.0gr of H322, CCI BR4 and Clay Spencer 68gr bullets. Shooting: I used .230 as bullet hole diameter (value to subtract) for calculating group size. I fired one fouler (producing a very small group). [b]Set "A"[/b] Group 1: .2605 neck three shots = .159" (.327 tall x .290 wide) Group 2: .2605 neck three shots = .166" (.335 tall x .368 wide) Group 3: .2605 neck three shots = .247" (.477 tall x .288 wide) Group 4: .2605 neck three shots = .520" (shot by a range visitor) (.750 tall x .546 wide) [b]Set "B"[/b] Group 5: .260 neck [b]five[/b] shots = .428" (shot by a range visitor) (.536 tall x .585 wide) Group 6: .260 neck three shots = .477" (.707 tall x .323 wide) (one round chambered "loose") Group 7: .260 neck [b]seven[/b] shots = .702" (.865 tall x .634 wide) (there are two fliers and two rounds extracted hard -hot rounds-) The two fliers are high by ~.4" [b]Set "C"[/b] Group 8: .261 neck [b]five[/b] shots = .892" (.814 tall x .941 wide) [b]Set "A"[/b] again for verification Group 9: .2605 neck [b]five[/b] shots = .330". (.561 tall x .546 wide) I did not clean the rifle between groups. There was some mirage from the barrel (cool day ~55F) but I waited until it was clear before shooting the later groups. I shot from a bipod and sand sock. The scope is a Leupold 6.5 x 20. Distance 100 yards. Wind = ~null Wilson seater OAL = ~2.220 (.020 over stated max length but not touching the lands.) Neck bushing in resize die = .259" I'm curious as to why some rounds seem hot (extract stiffly as compared to others on the once fired brass). With the case necks so thin (~.009) is there a special method to anneal them? For my 308 brass I use a tub of cold (iced) water, a ~1" blue propane flame and a count of 10 with the tip of the flame touching the middle of the revolving case neck. For these thin necks I'm thinking I'd melt the neck even with a short count. Note: The point of impact on groups 1,2,3 and 8 are primarily due to scope adjustments. [img]http://longrangehunter.com/images/6br-29H322-20Jan2006.jpg[/img] [/QUOTE]
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