Posted: 8/15/2016 12:38:37 PM EDT
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Ive turned necks, fireformed about 50 cases, all lapua, applied 1.4 thousandths neck tension to a 14.2 thousandths thick neck im using berger 185 hybrids 20 thou off lands and i measure each charge to within a few kernals difference (best i can possibly do on a rcbs beam scale, i take my time and make sure theyre as perfect as i can make them
Am i leaving out any crucial steps? Using a redding comp die set So far still working on loads but started getting decent accuracy @ 2450-2500 @ 42.5gr imr 4064 and below Going to work up charges from 42-40 todayas 44-42 did ok with the best being 42.5 and 42 slightly Trying to make a good 1000 yard gun out of my dt srs covert 27" long the shortest 1k yard gun ive ever seen. Learning now its mostly about the ammo and techniques I didnt know if i should fireform them before turning necks or just turn them and use them so i did half of them, what do you guys think who have been able to get very low SD numbers After i find a good charge i will work on seating deapths a bit Should i bother segregating cases by volume? I heard that wouldnt help much but idk Right now using the berger bullets, im not going to touch them because i doubt i could improve them any |
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I guess you didn't listen to my advice about loading some up and see what you get then try one thing at a time.
Or didn't you turn the necks yet? I showed you my results with LC 7.62 brass no neck turning. I think a good load is more important than brass prep minutiae when you start with quality brass. And you are starting with good brass. I like to fire form before getting too serious about results. |
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I tumble, size, trim/chamfer/deburr mouth, uniform primer pocket which is more for cleaning it out and then load. That's it. Use quality components and you don't have to go super BR anal on brass to get good accuracy. Cool, that is exactly what I do. I was wondering if I didn't do enough, but now I feel confident my brass prep is good. |
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14mm thick neck is over 1/2 an inch! thick of brass! you your rifles throat would have to be 1.410 " Quoted:
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Ive turned necks, fireformed about 50 cases, all lapua, applied 1.4mm neck tension to a 14mm thick neck 14mm thick neck is over 1/2 an inch! thick of brass! you your rifles throat would have to be 1.410 " Lol you could be right, i hate metrics. Its 14.2 something thing, with 1.4 something neck tension I guess i meant to say thousandths? Lol |
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Quoted:
I guess you didn't listen to my advice about loading some up and see what you get then try one thing at a time. Or didn't you turn the necks yet? I showed you my results with LC 7.62 brass no neck turning. I think a good load is more important than brass prep minutiae when you start with quality brass. And you are starting with good brass. I like to fire form before getting too serious about results. Took all your advice, compiled my results and they are by far the best ive done so far but i just want to continue to learn and develop. Ive shot 50 bullets during load testing so far, neck turned lapua brass and have been adjusting powder charges, almost done with that, then ill get back to playing around with seating deapth i started @ 20thou off as per bryan litz reccommendations. So far the lower i go in powder the better it shoots so i need to see where that stops before im completely done and ready to try deapth tests I just thought this was a more appropiate thread for asking these specific questions. Thx for all the help! Its good to know that, apart from uniforming already nicely uniformed primer pockets, im already hitting all the high notes and my results are starting to show. 6 batches of 5 rounds each, all the loads had a extreme deviation of 10 amongst others in the load so im really excited to finish up load dev and go out to 1k yards Ps my bullets from a 16" barrel dont go transsonic till approx 1200-1400 yards if i read correctly Berger 185 hybrid @ 2450 fps |
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Took all your advice, compiled my results and they are by far the best ive done so far but i just want to continue to learn and develop. Ive shot 50 bullets during load testing so far, neck turned lapua brass and have been adjusting powder charges, almost done with that, then ill get back to playing around with seating deapth i started @ 20thou off as per bryan litz reccommendations. So far the lower i go in powder the better it shoots so i need to see where that stops before im completely done and ready to try deapth tests I just thought this was a more appropiate thread for asking these specific questions. Thx for all the help! Its good to know that, apart from uniforming already nicely uniformed primer pockets, im already hitting all the high notes and my results are starting to show. 6 batches of 5 rounds each, all the loads had a extreme deviation of 10 amongst others in the load so im really excited to finish up load dev and go out to 1k yards Ps my bullets from a 16" barrel dont go transsonic till approx 1200-1400 yards if i read correctly Berger 185 hybrid @ 2450 fps Quoted:
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I guess you didn't listen to my advice about loading some up and see what you get then try one thing at a time. Or didn't you turn the necks yet? I showed you my results with LC 7.62 brass no neck turning. I think a good load is more important than brass prep minutiae when you start with quality brass. And you are starting with good brass. I like to fire form before getting too serious about results. Took all your advice, compiled my results and they are by far the best ive done so far but i just want to continue to learn and develop. Ive shot 50 bullets during load testing so far, neck turned lapua brass and have been adjusting powder charges, almost done with that, then ill get back to playing around with seating deapth i started @ 20thou off as per bryan litz reccommendations. So far the lower i go in powder the better it shoots so i need to see where that stops before im completely done and ready to try deapth tests I just thought this was a more appropiate thread for asking these specific questions. Thx for all the help! Its good to know that, apart from uniforming already nicely uniformed primer pockets, im already hitting all the high notes and my results are starting to show. 6 batches of 5 rounds each, all the loads had a extreme deviation of 10 amongst others in the load so im really excited to finish up load dev and go out to 1k yards Ps my bullets from a 16" barrel dont go transsonic till approx 1200-1400 yards if i read correctly Berger 185 hybrid @ 2450 fps Transonic starts about Mach 1.2. So if it is 70° the speed of sound will be 1129fps so transonic will be 1129*1.2=1355fps So transonic velocity is 1355fps. In that case at sea level with 2450fps you start going transonic at 855yds and go subsonic at 1080yds. |
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How high do you live?
At 3600 meters about 670 mb 15 degrees crlcius unmodified nato belgian shells removing projectile and adjusting to 40.5 gn of powder IMR 4064 175 gn sierra matsch king I do have a muzzle speed of 2420 with a ssg69 P1 5 cm groups 300 meter. |
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How high do you live? At 3600 meters about 670 mb 15 degrees crlcius unmodified nato belgian shells removing projectile and adjusting to 40.5 gn of powder IMR 4064 175 gn sierra matsch king I do have a muzzle speed of 2420 with a ssg69 P1 5 cm groups 300 meter. His profile says he's from Kentucky, the highest point in KY is about 4000 ft or 1200 m. eta: that is at the extreme east end of the state, most of the state is about 1000 ft or 330 m. |
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Ok. This explains why 42.5 gn IMR 4064 loads are used for 185 gn projectiles. At my home altitude I might not feel confident using loads over 39 gn because of preassure issues.
Increased air density allows you to use more propellant. Bullets are much faster here. And barrel stabilization of a projectile might work different. I do really have no clue it you can trust in the published ballistic data for high altitudes. I want to participate for the first time at a national benchrest competition with my .308 which will take place at 300 meter altitude in humid enviroment and have no idea how my rifle and ammo are going to behave. Im collecting data of publications at this forum. There are very good posts and guess you guys have a lot of experience shooting in lowlands. So please be patient if I add some new questions in the treads. |
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I live in the south east of the state, high in the appalachian mountains. Perry/knott county to be specific and do most of my shooting on top of mountain strip jobs which are no longer in use(thanks to our dear leader who killed coal)
Ive used up to 44.5gr imr 4064 with no real pressure signs behind the 185 berger hybrids. I also have a 1:8 twist But im definately no pro, just a beginner trying to learn the sport. Going to go to 800 yards this weekend and try my luck. I also have no knowledge of how to tell my current elevation other than its probably decently high on the tops of the appalachian mountains 
Ps these arent seated to mag length, theyre 20 thousandths off lands, oal 2.995" |
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I tumble, size, trim/chamfer/deburr mouth, uniform primer pocket which is more for cleaning it out and then load. That's it. Use quality components and you don't have to go super BR anal on brass to get good accuracy. I do the same and can achieve sub 1/2MOA 5-shot groups with my AT. That is with 168gr BTHP Hornady 2nds as well using BHA Match brass (mixed lots), CCI 200's, and 43.5gr of Varget. I hate load development and brass prep so 1/2 MOA or better is fine with me. |
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Thanks to everyones help, on the brass i neck turned(14.2 thousandths to clean up 90% of the cases), which seem like i did a fair job for my first go at it, i havnt trimmed them ever but check them all every time, just tumble then chamfer/debur necks, and clean primer pockets out. Size and reload on my progressive press. At 3 firings with my lapua brass(ran out of powder which i just bought 16lbs of imr 4064) have had no problems with n/o sizing and am getting unbelievable hair splitting accuracy! Ill trim if any ever grow past sammi max of 2.015 but i dont see it happening at this point, not a single one is even close.
I know some people dont like the brass prep, but i find it very enjoyable after a stressful day to sit and do these little things to my brass. I just enjoy meticulous reloading practices. So i do everything by hand besides the progressive press which sizes and primes and seats for me. I also weigh all my charges on an rcbs chargemaster 1500 Just so everyone knows, i dont really think the neck trimming is all that important, but i bought a sinclair setup for like 250$ ot so and i wanted to try it out. I kind of enjoy doing it now. Overall im going to say im averaging 1/4moa give or take Im going to look for a primer pocket uniformer next month when i buy some more christmas toys for the family As always, I appreciate the honest, helpful feedback of the community! Ps, i use right around 1.4 thou worth of neck tension, which isnt alot but works pretty good for me since i single feed my dta srs these bullets anyways I shot at 270 yards some fgmm 175gr smk factory ammo and hit a 2 inch by 3 inch steel plate(its old tank plating and we usually use it for hand guns thats why that particular target is so small) 4 for 4 times! Realised i had one more bullet after those and rushed the last shot, pretty confident it was my fault but worth mentioning. My hand loads hit 3 for 3 pretty much all in the same spot +\- maybe a quarter inch windage( there was no wind, thats just how it was stringing) i didnt really measure just checked after i finished Did learn fgmm 175 hit 1.5moa higher and .25mo to the left of my hand loads. And yes the wind on my kestral was really 0-1mph for the majority of My shots. Gotta love south east ky(obv thats not an every day occurrence but it does happen, mountains block most of the wind) Also learned my usual shooting spot elevation is only approx 1300 feet above sea level, its in a valley between two mountains shooting into one, can stretch it max to 6-800 but my usual spot is 400ish and less depending on what im doing Got a buddy taking me to another strip job next free weekend where he says he has targets set up out to 1200 ish. Cant wait to see what my loads will do then! |