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Rifles, Reloading, Optics, Equipment
Reloading
Ugly extreme spread........now what ?
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<blockquote data-quote="WiscGunner" data-source="post: 1672852" data-attributes="member: 97288"><p>I agree with what other have said regarding neck tention/brass prep. If neck length is not uniform you will have variations in neck holding strength even at the same neck diameters. Also using a mandrel to uniform necks tends to be more consistent than expander balls in a sizing die.</p><p></p><p>I personally think neck turning should be further down the list of priorities when looking for a good load. Especially with quality brass.</p><p></p><p>Granted I reload with once fired Prime/Norma brass but have no need to neck turn to get my SD's into the single digits and ES's below 15</p><p></p><p>My loadup is 41.5gr H4350, CCI BR2, 140eldm 2788fps avg, ES 11, SD 4.74 measured with a Magnetospeed V3. Consistently under .25" 5 shot groups. 1:8 twist 5r Bartein barrel chambered at Patriot Valley Arms</p><p></p><p>Prime/Norma brass cleaned in SS media ( 200pcs at a time to avoid excess tumbling/neck peening) sized in Forster Coax with Forster sizing dies (ball removed), trimmed to length in Giraud trimmer, opened with Sinclair .263 mandrel, primed on Forster Coax. Seated with Forster Micrometer die to 2.210 BTO (.02 off the lands). Groups shrink further off the lands but I figure this helps compensate for throat erosion as the jump increases.</p><p>Measuring done with Mahr digital calipers and Hornady comparitor kit. No neck turning, no primer pocket uniforming, no flash hole deburring, no brass weight sorting. Powder is thrown on an RCBS Chargemaster running on an APC battery backup for consistent voltage (big help)</p><p></p><p>It is also important to remember to use consistent pressure in seating your bullets. Getting lax here will give you some erratic results as well. I lean into my Forster to insure consistency.</p><p></p><p>I don't worry about group size or barrel temp when looking for velocity as long as my firing rate is fast. When doing group testing, I keep the round count under 3 because barrel mirage in my scope start to affect my groups after 4-5 rounds through my medium palma barrel.</p><p></p><p>The other big thing I would look at through is your chronograph. You haven't mentioned what it is. Optical chronographs are very finicky, especially cheep ones! This why Magnetospeeds and LabRadars are so popular. If you know someone whom you can borrow a Magnetospeed from to test your loads, I would highly recommend it. Although, very accurate, they too can have issue if sliding around under recoil as accentuated by pencil barrel profiles.</p><p></p><p>If you have taken short cuts in prep, measuring and equipment, just give up looking for good data and get 200 rounds burnt through your barrel. Then be meticulous so you can be confident in your data.</p></blockquote><p></p>
[QUOTE="WiscGunner, post: 1672852, member: 97288"] I agree with what other have said regarding neck tention/brass prep. If neck length is not uniform you will have variations in neck holding strength even at the same neck diameters. Also using a mandrel to uniform necks tends to be more consistent than expander balls in a sizing die. I personally think neck turning should be further down the list of priorities when looking for a good load. Especially with quality brass. Granted I reload with once fired Prime/Norma brass but have no need to neck turn to get my SD’s into the single digits and ES’s below 15 My loadup is 41.5gr H4350, CCI BR2, 140eldm 2788fps avg, ES 11, SD 4.74 measured with a Magnetospeed V3. Consistently under .25” 5 shot groups. 1:8 twist 5r Bartein barrel chambered at Patriot Valley Arms Prime/Norma brass cleaned in SS media ( 200pcs at a time to avoid excess tumbling/neck peening) sized in Forster Coax with Forster sizing dies (ball removed), trimmed to length in Giraud trimmer, opened with Sinclair .263 mandrel, primed on Forster Coax. Seated with Forster Micrometer die to 2.210 BTO (.02 off the lands). Groups shrink further off the lands but I figure this helps compensate for throat erosion as the jump increases. Measuring done with Mahr digital calipers and Hornady comparitor kit. No neck turning, no primer pocket uniforming, no flash hole deburring, no brass weight sorting. Powder is thrown on an RCBS Chargemaster running on an APC battery backup for consistent voltage (big help) It is also important to remember to use consistent pressure in seating your bullets. Getting lax here will give you some erratic results as well. I lean into my Forster to insure consistency. I don’t worry about group size or barrel temp when looking for velocity as long as my firing rate is fast. When doing group testing, I keep the round count under 3 because barrel mirage in my scope start to affect my groups after 4-5 rounds through my medium palma barrel. The other big thing I would look at through is your chronograph. You haven’t mentioned what it is. Optical chronographs are very finicky, especially cheep ones! This why Magnetospeeds and LabRadars are so popular. If you know someone whom you can borrow a Magnetospeed from to test your loads, I would highly recommend it. Although, very accurate, they too can have issue if sliding around under recoil as accentuated by pencil barrel profiles. If you have taken short cuts in prep, measuring and equipment, just give up looking for good data and get 200 rounds burnt through your barrel. Then be meticulous so you can be confident in your data. [/QUOTE]
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Ugly extreme spread........now what ?
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