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Rifles, Reloading, Optics, Equipment
Reloading
How to tighten up my group.
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<blockquote data-quote="Aussie" data-source="post: 127285" data-attributes="member: 2447"><p>lefty ,</p><p>Either there's a lot of cart before the horse happening here or others are making very positive assumptions about your level of reloading and load development experience .</p><p>How did you arrive at your chosen powder charge ? Did you work up at 0.3 gn or 0.5 gn increments checking and comparing each charge weight for accuracy ? Alternatively did you try a ladder test ?This is basic stuff and comes long before you start stuffing around with different primers , seating depths or neck sizing vs FL sizing .A half grain change in powder charge can halve group size or double it , particularly in a sporter weight barrel . In small cartridge cases you can measure accuracy differences with 0.2 gn changes in charge weight .</p><p>What you are looking for is a charge weight that produces a group with minimal vertical dispersion . Most horizontal dispersion is usually due to shooter error , rifle / scope problem or wind .</p><p>If you can't find a charge weight that provides </p><p>acceptable vertical dispersion then the first place to go is a change of powder or projectile . There's only one way to develop the most accurate load for your rifle and that's systematic trial and error . To minimise wasted time , effort and money you should start with the factors that have greatest influence first .</p></blockquote><p></p>
[QUOTE="Aussie, post: 127285, member: 2447"] lefty , Either there's a lot of cart before the horse happening here or others are making very positive assumptions about your level of reloading and load development experience . How did you arrive at your chosen powder charge ? Did you work up at 0.3 gn or 0.5 gn increments checking and comparing each charge weight for accuracy ? Alternatively did you try a ladder test ?This is basic stuff and comes long before you start stuffing around with different primers , seating depths or neck sizing vs FL sizing .A half grain change in powder charge can halve group size or double it , particularly in a sporter weight barrel . In small cartridge cases you can measure accuracy differences with 0.2 gn changes in charge weight . What you are looking for is a charge weight that produces a group with minimal vertical dispersion . Most horizontal dispersion is usually due to shooter error , rifle / scope problem or wind . If you can't find a charge weight that provides acceptable vertical dispersion then the first place to go is a change of powder or projectile . There's only one way to develop the most accurate load for your rifle and that's systematic trial and error . To minimise wasted time , effort and money you should start with the factors that have greatest influence first . [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How to tighten up my group.
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