Cast Bullet Question


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hdbiker
July 10, 2011, 10:48 AM
When weighing cast bullets, how much variation is ok for best accuracy ? Thanks biker

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243winxb
July 10, 2011, 10:52 AM
On pistol bullets, 357, 44, 45 under 3.0 gr. For 30 cal. rifle under 1.0 gr. is possible. The idea of weighing each bullet is to find the ones with an air bubble. They will be lighter. In general, find the midrange average of the bullets and use the light & heavy for practice. I dont weight pistol bullets unless working up a new load/bullet. http://i338.photobucket.com/albums/n420/joe1944usa/th_castbullets.jpg (http://s338.photobucket.com/albums/n420/joe1944usa/?action=view&current=castbullets.jpg) http://castboolits.gunloads.com/images/smilies/castmine.gif

bds
July 10, 2011, 11:08 AM
I found most commercial pistol lead bullets can vary 1-5+ grains depending on caliber and bullet weight.

When I want high level of consistency, I weigh the bullets and cluster in groups that are within 1 gr of each other. My match grade standard for bullet weight variation is less than 1 gr bullet-to-bullet. If I want the highest level of consistency for accuracy testing, I use bullets that are the same weight.

For range practice/plinking loads, 1-5 gr bullet weight variation won't affect accuracy that much; but depending on powder, charge variation of .2 gr or more will affect accuracy significantly.

snuffy
July 10, 2011, 11:38 AM
It depends on which bullet you're talking about. A 55 grain .223 cast bullet, a 1 grain difference is a LOT! A 200 grain 45 pistol bullet, 1 grain is nothing to worry about.

When I'm casting lets say a 200 RNFP in .452, I don't bother to weigh them. BUT I do visually inspect them. Poor fill-out visible as wrinkles and rounded bases, get returned to the pot. After visual inspection, those bullets would all be within 1-2 grains. Plenty good enough for IPSC or informal target practice.

One of these days, I'm going to take a bunch of bullets I rejected, size/lube/load them then shoot them alongside of what I passed on as good-to-go. Maybe I'm wasting my time!

hdbiker
July 10, 2011, 12:26 PM
thanks for the tips. biker

dagger dog
July 11, 2011, 07:52 AM
Just ran a batch of 500 RCBS 452-255's for use in 45 Colt. Samples range low of 267 to a high of 270 average of 268. It is possible to keep them + - 3 grs.

It's all in the technique once you learn your mold and the alloy and what temp to set the furnace you can get them pretty close

highlander 5
July 11, 2011, 08:58 AM
On all the rifle and pistol bullets I cast my weight variation is .05% -.01% depending on the bullet weight/caliber.

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