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Long Range Hunting & Shooting
Some guidance so I don't blow myself up...
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<blockquote data-quote="liltank" data-source="post: 327199" data-attributes="member: 13275"><p>Range update in the spirit of learning about powders and the effects of temperature. I went to the range today for some pressure testing. Now my warm weather load (70-90 degrees) is a 200grn. SMK with 61.5 grns of RL17. This produced .75" groups at 100yrds with a velocity of 2950. </p><p></p><p>Today I started at 59.5 grns of RL17 with a 208grn Hornady A-Max. The temperature at the range is between 40 and 45 degrees. I moved in half grain increments. I only went to 63.0 grains thinking this would far exceed my maximum with a heavier bullet. I ran out of tests bullets with little to no pressure signs. I went home and put together more starting at 63.5grns to 66.0grns in half grain increments. This time I pulled out the chronograph. I duplicated and exceeded my summer velocities using a heavier bullet. My max speed when i started getting ejector marks is around 3060fps. I am going to load a batch at 64.0, 64.5, and 65.0 grains. 65.5 and 66.0 grains produced a heavy bolt lift and ejector marks. </p><p></p><p>With a drop of 40 degrees avg. I am able to increase my loads by 3 to 4 grains. In the summer 62grns is my max and had poor performance. I have the bullet set .010" off the lands.</p><p></p><p>Tank</p></blockquote><p></p>
[QUOTE="liltank, post: 327199, member: 13275"] Range update in the spirit of learning about powders and the effects of temperature. I went to the range today for some pressure testing. Now my warm weather load (70-90 degrees) is a 200grn. SMK with 61.5 grns of RL17. This produced .75" groups at 100yrds with a velocity of 2950. Today I started at 59.5 grns of RL17 with a 208grn Hornady A-Max. The temperature at the range is between 40 and 45 degrees. I moved in half grain increments. I only went to 63.0 grains thinking this would far exceed my maximum with a heavier bullet. I ran out of tests bullets with little to no pressure signs. I went home and put together more starting at 63.5grns to 66.0grns in half grain increments. This time I pulled out the chronograph. I duplicated and exceeded my summer velocities using a heavier bullet. My max speed when i started getting ejector marks is around 3060fps. I am going to load a batch at 64.0, 64.5, and 65.0 grains. 65.5 and 66.0 grains produced a heavy bolt lift and ejector marks. With a drop of 40 degrees avg. I am able to increase my loads by 3 to 4 grains. In the summer 62grns is my max and had poor performance. I have the bullet set .010" off the lands. Tank [/QUOTE]
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Some guidance so I don't blow myself up...
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