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Rifles, Reloading, Optics, Equipment
Reloading
What to do when load data just doesn't exist?
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<blockquote data-quote="Dioxin" data-source="post: 1109542" data-attributes="member: 91707"><p>I've an Accuracy International rifle in 7.5 x55 Swiss, which I intend to use initially for punching paper/steel at long range.</p><p>The issue that I have is that load data is non existent.</p><p>I'm using Sierra Matchking 190 grains with Reload Swiss RS62 powder, and RWS 5620 Berdan Primers.</p><p>Reload Swiss give data for 175 grain Matchkings and 180 grain Norma HMK</p><p>Matchking has a powder range of 47-52 grains</p><p>Norma HMK has a powder range of 42-46 grains</p><p></p><p>I took the heavy bullet data as a base and at each .4 grain interval I made 5 rounds.</p><p>Carefully fired them, checking for pressure signs after every firing, none seen.</p><p></p><p>As I'm trying to extend my range as much as possible, I'd like the highest safe velocity, then tune downwards from there to find an accurate load.</p><p></p><p>Is the correct approach to continue .4 grain increments until I see pressure signs then use the powder charge below that as my powder/bullet combination max charge?</p><p></p><p>Let me know if you need more info.</p></blockquote><p></p>
[QUOTE="Dioxin, post: 1109542, member: 91707"] I've an Accuracy International rifle in 7.5 x55 Swiss, which I intend to use initially for punching paper/steel at long range. The issue that I have is that load data is non existent. I'm using Sierra Matchking 190 grains with Reload Swiss RS62 powder, and RWS 5620 Berdan Primers. Reload Swiss give data for 175 grain Matchkings and 180 grain Norma HMK Matchking has a powder range of 47-52 grains Norma HMK has a powder range of 42-46 grains I took the heavy bullet data as a base and at each .4 grain interval I made 5 rounds. Carefully fired them, checking for pressure signs after every firing, none seen. As I'm trying to extend my range as much as possible, I'd like the highest safe velocity, then tune downwards from there to find an accurate load. Is the correct approach to continue .4 grain increments until I see pressure signs then use the powder charge below that as my powder/bullet combination max charge? Let me know if you need more info. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What to do when load data just doesn't exist?
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