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Long Range Hunting & Shooting
7mm stw with 195 berger eol
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<blockquote data-quote="willowwolfe1975" data-source="post: 1579050" data-attributes="member: 94719"><p>So, I think I bit off a bit more than I could chew today. I made far too many test loads to try in the time I had today. My original plan was to test all powders at 0.5 grain steps of Min/Max recommendations. That was 180 rounds, so I had to change to 1.0 grain increments to help narrow things down. Also, I've never fired long batches like that, so barrel heat became an issue creating mirage after every 4-5 rounds. </p><p>Otherwise, I had an exceptional day for shooting. It was quite warm (-22C), wind was NIL and I was able to get a good set up with the wind at my back. Elevation is 224 meters, pressure 100.8 kpa, humidity 76%</p><p></p><p>My method was simple. Each powder had 5 extra rounds made at the minimum charge. These were used to bring temperature up to a running temp. 10 minutes between 5 shot groups, then 20 minutes cool down completely before moving to the next powder.</p><p>All ammunition and rifle was left outside prior to shooting to ensure everything was at a consistent temperature.</p><p>Rifle cleaned between each powder.</p><p>Shooting was prone in the snow using bipod and and rear bag.</p><p>Distance was 100y from muzzle to target.</p><p></p><p>This is what I got...</p><p></p><p>Out of all 5 shot groups, all but one group were sub MOA the largest being 1.029" using the 7828 at 68 grain. The retumbo was nicer to shoot giving a "shove" opposed to a "kick" the 7828 had the sharpest kick. Top loads show no indication of over pressure. I question the final group using the 7977 as a snowmobiler came by and decided to be a spectator. I typically don't have anyone else around when I'm shooting and the guy wouldn't stop talking...With that said I think this load deserves a redo.</p><p></p><p>COAL for all rounds is 3.600 (Olgive 2.999).</p><p>Hornady Brass - New, resized, trimmed to perfect length.</p><p>Primer - Federal 215m</p><p>Bullet - Berger 195 EOL</p><p></p><p>Retumbo - best group with 76.5 grains yielding a 5 shot group of 0.539"</p><p></p><p>IMR 7828 - best group with 68.0 grains yielding a five shot group of 0.619".</p><p></p><p>IMR 7977 - produced the best group today with 72.5 grains yielding a 5 shot group of 0.261 (one nice hole). </p><p></p><p>Despite the best group coming from the 7977, Retumbo's groups were all close in size despite the change in charge.</p><p></p><p>So, from here I guess I'll take the best of each and try to reproduce the results. If I can do that then I'll test either side of the load at 0.1 grain increments then move to testing distance from lands. Then increase charge to find my max.</p><p>Pretty excited with the results so far.</p></blockquote><p></p>
[QUOTE="willowwolfe1975, post: 1579050, member: 94719"] So, I think I bit off a bit more than I could chew today. I made far too many test loads to try in the time I had today. My original plan was to test all powders at 0.5 grain steps of Min/Max recommendations. That was 180 rounds, so I had to change to 1.0 grain increments to help narrow things down. Also, I've never fired long batches like that, so barrel heat became an issue creating mirage after every 4-5 rounds. Otherwise, I had an exceptional day for shooting. It was quite warm (-22C), wind was NIL and I was able to get a good set up with the wind at my back. Elevation is 224 meters, pressure 100.8 kpa, humidity 76% My method was simple. Each powder had 5 extra rounds made at the minimum charge. These were used to bring temperature up to a running temp. 10 minutes between 5 shot groups, then 20 minutes cool down completely before moving to the next powder. All ammunition and rifle was left outside prior to shooting to ensure everything was at a consistent temperature. Rifle cleaned between each powder. Shooting was prone in the snow using bipod and and rear bag. Distance was 100y from muzzle to target. This is what I got... Out of all 5 shot groups, all but one group were sub MOA the largest being 1.029" using the 7828 at 68 grain. The retumbo was nicer to shoot giving a "shove" opposed to a "kick" the 7828 had the sharpest kick. Top loads show no indication of over pressure. I question the final group using the 7977 as a snowmobiler came by and decided to be a spectator. I typically don't have anyone else around when I'm shooting and the guy wouldn't stop talking...With that said I think this load deserves a redo. COAL for all rounds is 3.600 (Olgive 2.999). Hornady Brass - New, resized, trimmed to perfect length. Primer - Federal 215m Bullet - Berger 195 EOL Retumbo - best group with 76.5 grains yielding a 5 shot group of 0.539" IMR 7828 - best group with 68.0 grains yielding a five shot group of 0.619". IMR 7977 - produced the best group today with 72.5 grains yielding a 5 shot group of 0.261 (one nice hole). Despite the best group coming from the 7977, Retumbo's groups were all close in size despite the change in charge. So, from here I guess I'll take the best of each and try to reproduce the results. If I can do that then I'll test either side of the load at 0.1 grain increments then move to testing distance from lands. Then increase charge to find my max. Pretty excited with the results so far. [/QUOTE]
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