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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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<blockquote data-quote="Tripodmvr7" data-source="post: 1998092" data-attributes="member: 115545"><p>Herewith a QL process in helping someone with load development with a Grendel and 108 Lapua Scenar bullets. Propellant is our local S321 from Somchem.</p><p></p><p>I first ran a calc to get on a node with a safe charge and gave him 27gr as an intermediate start load. He then shot a mini ladder at 200m. The ladder was his choice. Chrony at 5m so I have added 10fps to the readings.</p><p></p><p>I then calculated Node 6 at a charge of 27,2gr and advised him to check loads from 27,2/8 to see which performs best. This advice stems from combining his ladder data where two charges gave identical speeds. This is an indication of a node. The QL prediction is very close, but the practical might show a slight difference.</p><p></p><p>[ATTACH=full]218939[/ATTACH][ATTACH=full]218937[/ATTACH][ATTACH=full]218938[/ATTACH]</p></blockquote><p></p>
[QUOTE="Tripodmvr7, post: 1998092, member: 115545"] Herewith a QL process in helping someone with load development with a Grendel and 108 Lapua Scenar bullets. Propellant is our local S321 from Somchem. I first ran a calc to get on a node with a safe charge and gave him 27gr as an intermediate start load. He then shot a mini ladder at 200m. The ladder was his choice. Chrony at 5m so I have added 10fps to the readings. I then calculated Node 6 at a charge of 27,2gr and advised him to check loads from 27,2/8 to see which performs best. This advice stems from combining his ladder data where two charges gave identical speeds. This is an indication of a node. The QL prediction is very close, but the practical might show a slight difference. [ATTACH type="full" alt="Grendel 108gr Scenar Node 6.png"]218939[/ATTACH][ATTACH type="full" alt="Ruan Mos Speed Grendel.jpg"]218937[/ATTACH][ATTACH type="full" alt="Ruaan Mos Ladder.jpg"]218938[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
OBT method, barrel length vs velocity
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