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Canister grade powder is consistant (or as consistant as the manufacturer can make it) lot to lot for reloaders. When you buy a jug of H4895 you can be reasonably sure that it will load and perform the same as your last can of H4895. The ammunition manufacturers buy powder in boxcar size lots. They use test barrels and work up a load for that lot. When it's gone they start the process over with the next lot. Powder burn rate for the boxcars is probably similar, but density could vary. Therefore the load weights and volumes are different for each powder, but the ammunition performs about the same. Hope this helps.
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