I have worked up loads for .30-06 using 180 gr. bullet. I used some fired brass during the process of developing the loads, so each has been fired several times. Now I've found the load that works best in this rifle. I'm going to buy new brass, same manufacture as that used to development. Question is, does anybody know what if any difference there will be in pressure / velosity between fired / FL sized case used in development and new un-fired cases with same powder charge. I don't want to fire the new brass and then re-size it. Was going to assemble 50 rounds, seal primer and bullet and save for hunting.
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Fired brass vs. New brass velosity difference?
- Thread starter mcammo
- Start date
rick smith
Handloader
- Apr 6, 2005
- 1,249
- 0
The best way is to fire the new brass over a chronograph. Fired brass that is neck sized will have a little more internal dimension. How you set your FL die will have an effect on internal dimention. All that being said, probably makes no difference in hunting accuracy. Why are you going to use new brass for your hunting? My hunting rounds have been fired several times and just neck sized. Never had a problem with function.Rick.
- Thread starter
- #3
Rick,
I did this for a friend, the brass he has had been loaded several times and always FL sized, during the course of working up loads I had a few develope neck splits, figured it was time to retire it and start with new stuff. That is the reason for the question, he's ordering scope with built in yardage drop in elevation knob, we know the B.C. of bullet and velosity of rounds but was wondering if there would be measurable difference in velosity between fired / sized cases use to work up loads and new brass. Would like to think there is none but if someone has chronographed this situtation I'd like to know what they found. I guess I may have to load a few up with the new brass and shoot them over chrono and see what if any difference there is. I did do this load with R-P brass and then some Winchester, weighted both cases all had been preped the same there was noticable difference between R-P and Win. When I loaded this same load in the Win brass which held more water the velosity was down from the R-P brass no difference in accuracy but noticable drop in velosity. I threw this out hoping someone had tested this at some time and would save me the trouble. :grin:
I did this for a friend, the brass he has had been loaded several times and always FL sized, during the course of working up loads I had a few develope neck splits, figured it was time to retire it and start with new stuff. That is the reason for the question, he's ordering scope with built in yardage drop in elevation knob, we know the B.C. of bullet and velosity of rounds but was wondering if there would be measurable difference in velosity between fired / sized cases use to work up loads and new brass. Would like to think there is none but if someone has chronographed this situtation I'd like to know what they found. I guess I may have to load a few up with the new brass and shoot them over chrono and see what if any difference there is. I did do this load with R-P brass and then some Winchester, weighted both cases all had been preped the same there was noticable difference between R-P and Win. When I loaded this same load in the Win brass which held more water the velosity was down from the R-P brass no difference in accuracy but noticable drop in velosity. I threw this out hoping someone had tested this at some time and would save me the trouble. :grin:
- Thread starter
- #4
Rick,
I did this for a friend, the brass he has had been loaded several times and always FL sized, during the course of working up loads I had a few develope neck splits, figured it was time to retire it and start with new stuff. That is the reason for the question, he's ordering scope with built in yardage drop in elevation knob, we know the B.C. of bullet and velosity of rounds but was wondering if there would be measurable difference in velosity between fired / sized cases use to work up loads and new brass. Would like to think there is none but if someone has chronographed this situtation I'd like to know what they found. I guess I may have to load a few up with the new brass and shoot them over chrono and see what if any difference there is. I did do this load with R-P brass and then some Winchester, weighted both cases all had been preped the same there was noticable difference between R-P and Win. When I loaded this same load in the Win brass which held more water the velosity was down from the R-P brass no difference in accuracy but noticable drop in velosity. I threw this out hoping someone had tested this at some time and would save me the trouble. :grin:
I did this for a friend, the brass he has had been loaded several times and always FL sized, during the course of working up loads I had a few develope neck splits, figured it was time to retire it and start with new stuff. That is the reason for the question, he's ordering scope with built in yardage drop in elevation knob, we know the B.C. of bullet and velosity of rounds but was wondering if there would be measurable difference in velosity between fired / sized cases use to work up loads and new brass. Would like to think there is none but if someone has chronographed this situtation I'd like to know what they found. I guess I may have to load a few up with the new brass and shoot them over chrono and see what if any difference there is. I did do this load with R-P brass and then some Winchester, weighted both cases all had been preped the same there was noticable difference between R-P and Win. When I loaded this same load in the Win brass which held more water the velosity was down from the R-P brass no difference in accuracy but noticable drop in velosity. I threw this out hoping someone had tested this at some time and would save me the trouble. :grin:
rick smith
Handloader
- Apr 6, 2005
- 1,249
- 0
Are you FL sizing to fit the chamber or by die manufacturing instructions? When you change brass from one manufacturer to another, one should expect the velocity change. Try to stay with the same brass. However, unless you are getting 100fps or more change in velocity, the difference in drop really doesn't matter in a hunting situation out to 300 yards. Look at a velocity chart that shows drop and compare sighted in at where you sight them, from that point out to 300yds. For deer hunting, the kill zone is large enough for quite a bit of error in range estimation. Also think about trying to adjust the crosshairs to make up for the difference in drop at 300 yards with the 100 fps difference with a hunting scope, hope you can see that well. Some people say to hunt with new brass but I prefer brass that has been fired at least once in my rifle and neck sized.
How many times had the brass been loaded when the necks split? How old was the brass? What rifle are you shooting?
Your friend would do better to practice with your loads at his likely hunting range and you shouldn't worry about the difference in velocity.Rick.
How many times had the brass been loaded when the necks split? How old was the brass? What rifle are you shooting?
Your friend would do better to practice with your loads at his likely hunting range and you shouldn't worry about the difference in velocity.Rick.
- Thread starter
- #6
rick smith
Handloader
- Apr 6, 2005
- 1,249
- 0
If the necks are splitting with only a few loads, the brass may have been over worked by the sizer and expander ball. You need to measure the amount the neck is being sized and expanded by your die.Rick.
- Thread starter
- #8
rick smith
Handloader
- Apr 6, 2005
- 1,249
- 0
I would trash the unknown brass, buy new brass and work with it. With necks splitting you will shoot some rounds that will not be of any benefit to the outcome.Rick.
