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Rifles, Reloading, Optics, Equipment
Reloading
Strange load development results
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<blockquote data-quote="Krazy" data-source="post: 106718" data-attributes="member: 3285"><p>Well here is an update. I don't really understand why it works like this but it seems that seating the bullet deeper in the case makes the powder burn more efficiently. Here is what happened:</p><p></p><p>I tried faster powders (IMR 4350 &amp; H4831) and just broke 3100 FPS at max charge with slight pressure signs. I also tried a slower powder (H1000) and maxed out without pressure at just under 3100 FPS. So back to RL22 as at least I got 3125 with it. I started playing with seating depths and found that the deeper I seated the bullet in the case the more effect each grain of powder had on velocity. For example: </p><p></p><p>.03 off the lands with a 165 TSX</p><p></p><p>77 grains of RL22 got me 3100 FPS</p><p>78 grains got me 3096 FPS</p><p>79 grains got me 3056 FPS</p><p></p><p>Seems the powder stopped 'working' at 77 grains. In each case there were no pressure signs.</p><p></p><p></p><p>I moved to .05 off the lands and found that:</p><p></p><p>77 grains of RL22 got me 3057 FPS</p><p>78 grains got me 3125 FPS</p><p>78.5 grains got me 3161 FPS</p><p>79 grains got me 3195 FPS</p><p>79.5 grains got me 3187</p><p></p><p>Seems that at this bulet seating the powder stopped 'working' at 79 grains. In each case there were no pressure signs.</p><p></p><p>I am going to try seating at .07 off the lands next to see if it will allow the powder to use the full 80 grains that my book says is max.</p><p></p><p>The consequence of gaining velocity using this method, however, seems to be accuracy. Not much so far though as the 78.5 shot .7 and the 79 shot 1.18. At .03 off the lands 77 shot at .7 while 78 and 79 shot .6 even though velocity dropped and ES increased.</p><p></p><p>So that's my story - is this typical or is my rifle a freak?</p><p></p><p>Thanks for all the help......... </p><p></p><p>The OAL for this bullet in this rifle is 3.567. I guess I should have started at 3.34 like my manual said and I would not have experiened these issues - i just thought I would get better performance closer to the lands so that is where I started.</p></blockquote><p></p>
[QUOTE="Krazy, post: 106718, member: 3285"] Well here is an update. I don't really understand why it works like this but it seems that seating the bullet deeper in the case makes the powder burn more efficiently. Here is what happened: I tried faster powders (IMR 4350 & H4831) and just broke 3100 FPS at max charge with slight pressure signs. I also tried a slower powder (H1000) and maxed out without pressure at just under 3100 FPS. So back to RL22 as at least I got 3125 with it. I started playing with seating depths and found that the deeper I seated the bullet in the case the more effect each grain of powder had on velocity. For example: .03 off the lands with a 165 TSX 77 grains of RL22 got me 3100 FPS 78 grains got me 3096 FPS 79 grains got me 3056 FPS Seems the powder stopped 'working' at 77 grains. In each case there were no pressure signs. I moved to .05 off the lands and found that: 77 grains of RL22 got me 3057 FPS 78 grains got me 3125 FPS 78.5 grains got me 3161 FPS 79 grains got me 3195 FPS 79.5 grains got me 3187 Seems that at this bulet seating the powder stopped 'working' at 79 grains. In each case there were no pressure signs. I am going to try seating at .07 off the lands next to see if it will allow the powder to use the full 80 grains that my book says is max. The consequence of gaining velocity using this method, however, seems to be accuracy. Not much so far though as the 78.5 shot .7 and the 79 shot 1.18. At .03 off the lands 77 shot at .7 while 78 and 79 shot .6 even though velocity dropped and ES increased. So that's my story - is this typical or is my rifle a freak? Thanks for all the help......... The OAL for this bullet in this rifle is 3.567. I guess I should have started at 3.34 like my manual said and I would not have experiened these issues - i just thought I would get better performance closer to the lands so that is where I started. [/QUOTE]
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Strange load development results
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