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Reloading
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<blockquote data-quote="Lefty7mmstw" data-source="post: 842573" data-attributes="member: 48043"><p>I have run up rl33 in the lh 7stw and lh 300 rum with heavy bullets. I did comparisons vs. retumbo and other similar powders available and used their data with the 7stw subbing in the 171 barnes for the 175 speer. What I found with the 171 wasn't spectacular, with my rifle eating 82 and 84 grain charges and being slightly over-pressure (slightly heavy lift and flattened primers without loosening pockets or deforming the head) with 86 grains. The accuracy wasn't terribly great, but I suspect that is my rifle's 10" twist with the long hp style bullet. My rl 50 groups, rl25 groups, and retumbo groups also confirmed the edge of stability also with the 171 barnes, with ammo turning in .25 moa at 100 one day (with rl25 mostly) and 2 moa + from the same box of ammo another day. With all the messing around with the lh stw, I've already got 300 confirmed holes in paper (saved targets) with another 100-200 rounds fired on top of that. She's turning in .5 moa 5 shot groups at 100 yards with 82 rl25 with the 140 accubond, so I'm sure she's just about shot out.</p><p> </p><p>With the lh 300 rum and the 225 grain hornady the Retumbo top was 89 grains for hodgdon with a 220 partition, sierra runs 89 h1000 with their 220's, and the 300 roy 220 grain data on the rl33 poop sheet shows 89 grains with a 220 sierra, so I simply walked up from 89 grains and finally got good acuracy/ good pressure at 95 grains rl33. The load is turning in 1.1" at 200 in a 9" 300 rum without a brake in flaky wind so I think it'll do. The load has tenatively chronoed ( still need to get it over the oehler) at 3,000 fps which is 130 fps faster than rl50 would do without the compression being asinine. We ( my brother also shot a 300 rum for a bit ( he had a heavier rifle and a brake- pansy)and he was rolling some test loads in nosler brass as a secondary reference) did get rl50 to 3,000 fps with the 225 hdy, but the extra powder compression was beginning to make the seating plug dig into the bullet.</p><p> </p><p> </p><p>I see on the 300 rum bbl life thread you are going from 94 to 103 grains with the 230 hybrid; I think you may want to step down your first couple of loads a bit as that is a rather stiff start to the game. The rum is rather forgiving as to reduced loads as compared to some of the smaller bores with less bullet load. I went from 96 grains i 5010 to 112 grains with the 180 hornady when I was using that powder before settling at 3320 fps with 107 grains i5010. To bad that stuff went bad as it was better performing than most of what's out today. I never got to chrono the 112 grain load but I did load up a box and let my brother get the crap kicked out of him with it before I backed down.</p><p> </p><p> </p><p>With my 7stw ( my old sendero) and rl25 I was shooting 140 sierra's at 3350 fps and 140 accubonds at 3450 fps well before data came out. I cheated a bit there and ran it up starting with rl22/I7828 data for the stw and put a strain gauge on the rifle to confirm. With rl25 I was able to get similar speed to I 7828 using the 140 sierra with 6,ooo psi less pressure and better accuracy to boot. The pressure graphs are in the stw sub-forums if you poke around a bit.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 842573, member: 48043"] I have run up rl33 in the lh 7stw and lh 300 rum with heavy bullets. I did comparisons vs. retumbo and other similar powders available and used their data with the 7stw subbing in the 171 barnes for the 175 speer. What I found with the 171 wasn't spectacular, with my rifle eating 82 and 84 grain charges and being slightly over-pressure (slightly heavy lift and flattened primers without loosening pockets or deforming the head) with 86 grains. The accuracy wasn't terribly great, but I suspect that is my rifle's 10" twist with the long hp style bullet. My rl 50 groups, rl25 groups, and retumbo groups also confirmed the edge of stability also with the 171 barnes, with ammo turning in .25 moa at 100 one day (with rl25 mostly) and 2 moa + from the same box of ammo another day. With all the messing around with the lh stw, I've already got 300 confirmed holes in paper (saved targets) with another 100-200 rounds fired on top of that. She's turning in .5 moa 5 shot groups at 100 yards with 82 rl25 with the 140 accubond, so I'm sure she's just about shot out. With the lh 300 rum and the 225 grain hornady the Retumbo top was 89 grains for hodgdon with a 220 partition, sierra runs 89 h1000 with their 220's, and the 300 roy 220 grain data on the rl33 poop sheet shows 89 grains with a 220 sierra, so I simply walked up from 89 grains and finally got good acuracy/ good pressure at 95 grains rl33. The load is turning in 1.1" at 200 in a 9" 300 rum without a brake in flaky wind so I think it'll do. The load has tenatively chronoed ( still need to get it over the oehler) at 3,000 fps which is 130 fps faster than rl50 would do without the compression being asinine. We ( my brother also shot a 300 rum for a bit ( he had a heavier rifle and a brake- pansy)and he was rolling some test loads in nosler brass as a secondary reference) did get rl50 to 3,000 fps with the 225 hdy, but the extra powder compression was beginning to make the seating plug dig into the bullet. I see on the 300 rum bbl life thread you are going from 94 to 103 grains with the 230 hybrid; I think you may want to step down your first couple of loads a bit as that is a rather stiff start to the game. The rum is rather forgiving as to reduced loads as compared to some of the smaller bores with less bullet load. I went from 96 grains i 5010 to 112 grains with the 180 hornady when I was using that powder before settling at 3320 fps with 107 grains i5010. To bad that stuff went bad as it was better performing than most of what's out today. I never got to chrono the 112 grain load but I did load up a box and let my brother get the crap kicked out of him with it before I backed down. With my 7stw ( my old sendero) and rl25 I was shooting 140 sierra's at 3350 fps and 140 accubonds at 3450 fps well before data came out. I cheated a bit there and ran it up starting with rl22/I7828 data for the stw and put a strain gauge on the rifle to confirm. With rl25 I was able to get similar speed to I 7828 using the 140 sierra with 6,ooo psi less pressure and better accuracy to boot. The pressure graphs are in the stw sub-forums if you poke around a bit. [/QUOTE]
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