just a question to throw out there ,does the volume of say 10 grains of h322 equall the volume of 10 grains of h335? or more to the point does the volume of IMR 4350 @ 10gr = the volume of 10gr of Win 760? thats a comparison between stick and ball powder... the reason I ask is I have seen some quick load information and in that information some of the load data seemed really high for the cartridge in question.. One Inever look a gift horse in the mouth,, I really appreciate that info dearly, and some of the good velocity loads were with powder I dont have on hand and I need to know that if I buy that new powder it will actually fit in my cartridge like it says....I dont want to buy a pig in a poke..
weight of powder
- Thread starter crustyrusty
- Start date
Ned Ludd
Silver $$ Contributor
The answer will vary depending on the two powders you're comparing. Different powders often have different densities and different shapes, which means that equal powder weights will not occupy equal volume. Only for those powders of very similar density and shape will the volumes of equal powder weights be the same. For example, large kernel stick powders will occupy a much greater volume for a given powder weight than a stick powder with small compact kernels, or a ball powder.
For a given case volume input and seating depth (COAL) with a given bullet, QuickLoad will give you a fill ratio for a given weight of powder. You'd generally like to keep the fill ratio somewhere between about 95% and no more than ~103-105% fill ratio. In some cases, it is simply not possible to achieve reasonable pressure/velocity with some powders because you can't get enough powder in the case without compressing it so much that seating bullets becomes an issue.
One example of this is with H4350 and 200+ gr bullets in .308 Win loads. It's not a combination you see used very often because you can achieve much higher velocity with Varget, H4895, or other powders in the same burn rate range that have much smaller kernels, and that also allow you to maintain the case fill ratio above 95%, but not heavily compressed. Although not written in stone, it is also a fairly common for stick powders with slower burn rates intended for larger cartridges and heavy bullets to have noticeably larger kernels than do fast burning powders intended for smaller cartridges with lighter bullets.
For a given case volume input and seating depth (COAL) with a given bullet, QuickLoad will give you a fill ratio for a given weight of powder. You'd generally like to keep the fill ratio somewhere between about 95% and no more than ~103-105% fill ratio. In some cases, it is simply not possible to achieve reasonable pressure/velocity with some powders because you can't get enough powder in the case without compressing it so much that seating bullets becomes an issue.
One example of this is with H4350 and 200+ gr bullets in .308 Win loads. It's not a combination you see used very often because you can achieve much higher velocity with Varget, H4895, or other powders in the same burn rate range that have much smaller kernels, and that also allow you to maintain the case fill ratio above 95%, but not heavily compressed. Although not written in stone, it is also a fairly common for stick powders with slower burn rates intended for larger cartridges and heavy bullets to have noticeably larger kernels than do fast burning powders intended for smaller cartridges with lighter bullets.
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Lee VDM chart https://leeprecision.com/cgi-data/instruct/VMD.pdf
VMD is the volume of one grain of gunpowder in cubic centimeters. To find the volume of a powder charge, multiply the grains of powder by the VMD
The Hodgdon load data website shows if it a compressed load. Not much help if loading for a wildcat cartridge. http://www.hodgdonreloading.com/
VMD is the volume of one grain of gunpowder in cubic centimeters. To find the volume of a powder charge, multiply the grains of powder by the VMD
The Hodgdon load data website shows if it a compressed load. Not much help if loading for a wildcat cartridge. http://www.hodgdonreloading.com/
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