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Rifles, Reloading, Optics, Equipment
Reloading
Please Help Me Develop a Load for 145 GR LRX in 7 MM WBY Magnum
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<blockquote data-quote="chesspunker" data-source="post: 1461601" data-attributes="member: 106356"><p>I was surprised by my velocity test yesterday for my quest find out where my max load weight for H4831SC is. When I initially tested with Reloader 22, I was at 3300 FPS when I hit 71.1 grains of powder and for that Barnes recipe, the max load is listed at 74.5 grains of powder. I was close to maxing out and was still more than 3 grains from the max with RL 22.</p><p></p><p>I was anticipating the same sort of thing with H4831SC, but what I found is that changes in powder weight with this powder produce way less velocity change. The Barnes recipe calls for the minimum with H4831SC to be 66.5 grains and the maximum to be 73.0 grains. Below is every speed for every shot:</p><p></p><p>66.5 grains = 2872 fps</p><p>67.5 grains = 2999 fps</p><p>68.0 grains = 2967 fps</p><p>68.5 grains = 2960 fps</p><p>69.0 grains = 3022 fps</p><p>69.5 grains = 3040 fps</p><p>70.0 grains = 3059 fps</p><p>70.5 grains = 3087 fps</p><p>71.0 grains = 3067 fps</p><p>71.5 grains = 3106 fps</p><p>72.0 grains = 3140 fps</p><p>72.5 grains = 3170 fps</p><p>73.0 grains = 3173 fps</p><p></p><p>I show absolutely no signs of over-pressure so I'm going back to the range today. I loaded up 9 more rounds starting with 73.5 and going up in 0.5 grain increments. I will be very careful shooting these rounds and as soon as one of them gets very close or slightly above 3300 FPS I will stop. Even at my highest bullet weight of 77.5 grains (I may not shoot that bullet today) I can still hear the powder shaking in the case so I don't think it's compressed.</p><p></p><p>Yesterday I shot three shots in a short period of time and then I would wait 20 minutes until my barrel completely cooled for the next three shots. All of my shots except for one of them was in a vertical line. The first shot from a dead cold barrel was the highest shot. The next shot would be about 1" lower and the third shot would be about 1" lower than the second. They were all in a vertical line with almost no side to side displacement. I'm not sure if this means anything since each shot had 0.5 grains more powder than the next.</p><p></p><p>When I find a velocity node and test for accuracy I'm going to let my gun completely cool down between shots. I also won't have the chronograph strapped to my barrel which might change the way my barrel shoots especially if I let it get hot.</p><p></p><p>Feel free to comment on this post especially if you have anything to add about safety precautions I should take on my test today as I try to find 3300 FPS.</p></blockquote><p></p>
[QUOTE="chesspunker, post: 1461601, member: 106356"] I was surprised by my velocity test yesterday for my quest find out where my max load weight for H4831SC is. When I initially tested with Reloader 22, I was at 3300 FPS when I hit 71.1 grains of powder and for that Barnes recipe, the max load is listed at 74.5 grains of powder. I was close to maxing out and was still more than 3 grains from the max with RL 22. I was anticipating the same sort of thing with H4831SC, but what I found is that changes in powder weight with this powder produce way less velocity change. The Barnes recipe calls for the minimum with H4831SC to be 66.5 grains and the maximum to be 73.0 grains. Below is every speed for every shot: 66.5 grains = 2872 fps 67.5 grains = 2999 fps 68.0 grains = 2967 fps 68.5 grains = 2960 fps 69.0 grains = 3022 fps 69.5 grains = 3040 fps 70.0 grains = 3059 fps 70.5 grains = 3087 fps 71.0 grains = 3067 fps 71.5 grains = 3106 fps 72.0 grains = 3140 fps 72.5 grains = 3170 fps 73.0 grains = 3173 fps I show absolutely no signs of over-pressure so I'm going back to the range today. I loaded up 9 more rounds starting with 73.5 and going up in 0.5 grain increments. I will be very careful shooting these rounds and as soon as one of them gets very close or slightly above 3300 FPS I will stop. Even at my highest bullet weight of 77.5 grains (I may not shoot that bullet today) I can still hear the powder shaking in the case so I don't think it's compressed. Yesterday I shot three shots in a short period of time and then I would wait 20 minutes until my barrel completely cooled for the next three shots. All of my shots except for one of them was in a vertical line. The first shot from a dead cold barrel was the highest shot. The next shot would be about 1" lower and the third shot would be about 1" lower than the second. They were all in a vertical line with almost no side to side displacement. I'm not sure if this means anything since each shot had 0.5 grains more powder than the next. When I find a velocity node and test for accuracy I'm going to let my gun completely cool down between shots. I also won't have the chronograph strapped to my barrel which might change the way my barrel shoots especially if I let it get hot. Feel free to comment on this post especially if you have anything to add about safety precautions I should take on my test today as I try to find 3300 FPS. [/QUOTE]
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Please Help Me Develop a Load for 145 GR LRX in 7 MM WBY Magnum
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