Shot size vs. density


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Daveweldz
March 13, 2009, 12:06 AM
Saw this on a couple threads in the past with no definative answer. Did a semi scientific test and thought it might be worth sharing. The question was how much difference does shot size make on the weight of shot per a given volume, like a shot cup. I found a graduated cylinder (remember chemistry class) that was very close to the ID of a 12 ga shell. I slid in an RP12 wad. Put this on the scale and zero'd it. I had #1 buck, #4. #6 and #8 shot. I filled this with 15ea #1 buck, the top most pellets came up to the 6.6 ml line. I weighed this and then repeated the process with the smaller pellets. I filled to the same height everytime figuring that this was as tight as you would want to crimp the shell.

The results are as follows with #8 shot being 100% weight
#6 was 92% weight ,#4 was 89% weight and #1 buck was 80%. I put this on a chart vs the pellet diameter and saw a predicatable curve but am not smart enough to post it here. Just for grins I tried some #8 reclaimed shot, I was thinking this beat up shot might "nest" a bit tighter but it came in at 99% of the weight of virginal #8. So on the surface it does appear that when confined to the size and shape of a shot cup or bushing ,shot size could vary weight by 10%? Also if you weight the shot thrown by a given bushing going to a larger shot will reduce this a bit. This is a marginally scientific observation and has most likely been posted before but thought it fun to share.

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snuffy
March 13, 2009, 02:01 AM
Dave, the Hornady shot bushings are sold specifically to load exact weights by shot size. That means they have done the figuring you have just done. Oh, and they tell you the difference if you're using high antimony, magnum, shot versus the standard chilled shot. (The magnum shot is lighter, because it's harder).

Daveweldz
March 13, 2009, 10:22 AM
Now you tell me. Thats one manuel I dont have, guess I'll be getting one.

Thanx Dave

rcmodel
March 13, 2009, 01:58 PM
The Hornady reloading manual has no shotgun data or information in it at all.

The info is available here:
https://www.hornady.com/shop/?ps_session=223ca8b74067528cf433051a1a7d8c98&page=shop%2Fbrowse&category_id=e0d5534d9c67eac5ac39afbd34a7cf56

https://www.hornady.com/shop/?ps_session=223ca8b74067528cf433051a1a7d8c98&page=shop%2Fbrowse&category_id=0528f9debb337918556ea47cecdd45cc

https://www.hornady.com/shop/?ps_session=223ca8b74067528cf433051a1a7d8c98&page=shop%2Fbrowse&category_id=ae863f2527ca0e15b25fcb5844e6277d

rc

FredT
March 13, 2009, 02:50 PM
The adjustable shot bar for MEC also allows for a more precise pay load.

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