Bullet weight comparison based on alloy?

[Shooter6br]

What is the % differance in weight for a 200g bullet(No 1 alloy) vs say using 20-1, 25-1 ,30-1? The definitive answer is to cast them with the differant alloy and see. Need a quick and dirty answer Thanks

[Edubya]

I'll often get 1% difference on same alloy with same mould cast side by each. I don't think that you'd be able to get a scale to tell you the difference in alloy when there are already too many variables introduced into the operation.
I'll admit that I have tried it but it was with linotype and WW. If I remember correctly they were about 12gr difference with the lino being the lower. BTW, that was a 250gr boolit.

EW

[SciFiJim]

I haven't seen that info here before (doesn't mean it's not here). If you do the work to find the definitive answer, please post it. It would be interesting to see a chart of weights and sizes of different alloys cast in the same cavity. Since most of us never get out alloy assayed, we are never sure of EXACTLY what is in it. Alot of what we do is art with some science thrown in rather than pure science.

[starbits]

What is the % differance in weight for a 200g bullet(No 1 alloy) vs say using 20-1, 25-1 ,30-1? The definitive answer is to cast them with the differant alloy and see. Need a quick and dirty answer Thanks

Quick and dirty I don't know what No 1 Alloy is. However here are some figures for you

Calculated densities in grams per cubic centimeter

Lyman #2...10.67
20-1............11.05
clipon ww....11.08
25-1............11.10
30-1............11.14
pure lead....11.34

If you are getting a 200 gn boolit with clipon ww and you want to see what Lyman #2 would be, here is the math

boolit weight times density of #2 divided by density of ww

200*10.67/11.08 = 192.6gn

for a 200gn lyman #2 boolit the conversion to 25-1 would be

200*11.10/10.67 = 206.2

You can mix and match to compare for a rough estimate, but the mold, temp, and how you cast will all have an effect also.

Starbits

[Edubya]

Quick and dirty I don't know what No 1 Alloy is. However here are some figures for you

Calculated densities in grams per cubic centimeter
Starbits

Starbits, I assume that you meat "grains" but I thought that it should be clarified for a possible future reader. If not, I don't understand your equation without converting the 200 grains to 12.959782 grams first.
http://tinyurl.com/grains-to-grams

EW

[Old Goat Keeper]

This thread should become a "STICKEY"!

Tom

[Old Goat Keeper]

Starbits don't you have the "10.67" and"11.08 transposed? Why? Because goign from a 200 grain Lyman#2 to the same boolit in WW it should weight MORE not less than the original boolit.

Tom



Quick and dirty I don't know what No 1 Alloy is. However here are some figures for you

Calculated densities in grams per cubic centimeter

Lyman #2...10.67
20-1............11.05
clipon ww....11.08
25-1............11.10
30-1............11.14
pure lead....11.34

If you are getting a 200 gn boolit with clipon ww and you want to see what Lyman #2 would be, here is the math

boolit weight times density of #2 divided by density of ww

200*10.67/11.08 = 192.6gn

for a 200gn lyman #2 boolit the conversion to 25-1 would be

200*11.10/10.67 = 206.2

You can mix and match to compare for a rough estimate, but the mold, temp, and how you cast will all have an effect also.

Starbits

[starbits]

Starbits don't you have the "10.67" and"11.08 transposed? Why? Because goign from a 200 grain Lyman#2 to the same boolit in WW it should weight MORE not less than the original boolit.

Tom

goatkeeper I guess I wasn't clear enough. If you have a mold throwing boolits of 200 grains using ww and you wondered what it would throw in #2 (every thing else being equal) you would use the equation as above. Think of it as #2 is 90% lead and ww are 96.5% lead the #2 will be lighter because it has less lead and more of the less dense metals. Put into words the equation is

weight of boolit you cast in grains [times] density of alloy you are interested in [divided by] the density of the boolit alloy you cast the boolit in


Starbits, I assume that you meant "grains" but I thought that it should be clarified for a possible future reader. If not, I don't understand your equation without converting the 200 grains to 12.959782 grams first.

Actually grams is correct, but it doesn't matter for the equation. Using just the units the equation is

boolit grains * grams / grams = boolit grains
because the grams cancil each other all that is left is the weight in grains

Starbits

[Edubya]

Thanks Starbits. I'm not much at math but since you explained it like that, even I can understand it. Sure glad that there are smarter people around than I.

EW