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Rifles, Reloading, Optics, Equipment
Reloading
Pressure build near max for ball powders
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<blockquote data-quote="Tac-O" data-source="post: 2726036" data-attributes="member: 109994"><p>I thought I'd read in my loading manuals somewhere that ball powders will build pressure very quickly when you get near max, ie they have a steeper pressure curve than extruded powders. I looked and can't find that statement in them though. Maybe I read it on here or in a reloading video, but I can't find it in the search here.</p><p>So, specifically for Ramshot Hunter and Staball 6.5, but also for ball powders in general, do you start seeing larger jumps in velocity when doing a pressure ladder with ball powders when you get close to pressure?</p><p></p><p>Here's my pressure ladder data from last weekend. It is an AI case, so I assume that it is masking some pressure signs. I can't believe that I'm not at max pressure with the higher end charges of staball.</p><p></p><p>185 juggernauts</p><p>Cci200</p><p>30-284AI (68.75gr H20 cap, use 30-06 data)</p><p>Peterson brass</p><p>24" 10twist 4 groove</p><p>Temperature 32F, although cartridges were stored in my house overnight</p><p></p><p>All recorded with a Caldwell chronograph. It was in the shade, so it should have read these accurately.</p><p></p><p></p><p>Hunter - *1gr charge jump from 58-59</p><p>56.5 - 2798</p><p>57 - 2795</p><p>57.5 - 2793</p><p>58 - 2809</p><p>59 - 2874</p><p>59.5 - 2857</p><p>60 - 2873</p><p>60.5 - 2917 full case</p><p></p><p>Staball - *1.5gr charge jump from 56-57.5</p><p>54.5 - 2708</p><p>55 - 2700</p><p>55.5 - 2732</p><p>56 - 2732</p><p>57.5 - 2862</p><p>58 - 2881</p><p>58.5 - 2906</p><p>59 - 2942</p><p></p><p>[ATTACH=full]431887[/ATTACH]</p><p></p><p>No definitive pressure signs but a very slight ejector mark on the highest hunter charge.</p><p></p><p>For a follow up, I want to shoot 10 rounds each of one charge of each powder, but not sure which one to pick. I don't want to base that on any kind of apparent "node", but want to pick a charge that is 1-1.5gr below max. I'm thinking maybe 59-59.5 for hunter and 57.5 - 58 for staball.</p><p></p><p>Thoughts and experiences?</p></blockquote><p></p>
[QUOTE="Tac-O, post: 2726036, member: 109994"] I thought I'd read in my loading manuals somewhere that ball powders will build pressure very quickly when you get near max, ie they have a steeper pressure curve than extruded powders. I looked and can't find that statement in them though. Maybe I read it on here or in a reloading video, but I can't find it in the search here. So, specifically for Ramshot Hunter and Staball 6.5, but also for ball powders in general, do you start seeing larger jumps in velocity when doing a pressure ladder with ball powders when you get close to pressure? Here's my pressure ladder data from last weekend. It is an AI case, so I assume that it is masking some pressure signs. I can't believe that I'm not at max pressure with the higher end charges of staball. 185 juggernauts Cci200 30-284AI (68.75gr H20 cap, use 30-06 data) Peterson brass 24" 10twist 4 groove Temperature 32F, although cartridges were stored in my house overnight All recorded with a Caldwell chronograph. It was in the shade, so it should have read these accurately. Hunter - *1gr charge jump from 58-59 56.5 - 2798 57 - 2795 57.5 - 2793 58 - 2809 59 - 2874 59.5 - 2857 60 - 2873 60.5 - 2917 full case Staball - *1.5gr charge jump from 56-57.5 54.5 - 2708 55 - 2700 55.5 - 2732 56 - 2732 57.5 - 2862 58 - 2881 58.5 - 2906 59 - 2942 [ATTACH type="full"]431887[/ATTACH] No definitive pressure signs but a very slight ejector mark on the highest hunter charge. For a follow up, I want to shoot 10 rounds each of one charge of each powder, but not sure which one to pick. I don't want to base that on any kind of apparent "node", but want to pick a charge that is 1-1.5gr below max. I'm thinking maybe 59-59.5 for hunter and 57.5 - 58 for staball. Thoughts and experiences? [/QUOTE]
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Pressure build near max for ball powders
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