I'm over weight

[shootinxd]

Yep I just cast some of the purdyest 145 grn 40 cal boolits ya ever seen.only problem is there over weight by more than12 grn on average heavy.Any suggestions?

[garandsrus]

Shootinxd,

Yery common and not a problem... The stated mold weight is usually based on Lyman #2 alloy. You are probably using something with less tin and antimony, resulting in a heavier boolit. If you cast straight linotype you will be underweight.

John

[RobS]

This happens often especially if it is a Lee mold. Just about every production mold will cast bullets that are a bit off from what is the stated weight. My RCBS molds are all heavier, Lee heavier, Lyman heavier, NEI mold that I had was way heavy (but I knew it would be), and the only molds that I have that are close to right on are my custom molds.

The only way to have an around about idea is to search the forum or to ask individuals here as to what mold you are looking at and what their experiences are with such mold.

[HeavyMetal]

You must have a Lee mold as they are the only ones, that I know of, that make a 145 production mold for the 40 / 10mm.

If your using stick on wheel weight metal this explains why you are a bit on the heavy side. Boolit diameter might be a little small as well.

Some clip on wheel weights and a bit of 95-5 lead free solder can bring yu back in line with the weight issue if your interested.

[sagacious]

Not a problem at all. There's a huge amount of of published data available for the 40SW using a 150-155gr lead bullet.

LEE says their molds are cut for 1:10 tin/lead alloy. You could try that, or attempt to modify your alloy, but it might be more practical to simply load for the alloy you're using now.

[Shiloh]

Load your boolits with using data for that given weight. You can tweak your alloy, but I don't think get them spot on to 145.

I have molds that weigh heavy. My biggest beef is boolits that are undersized.

Shiloh

[243winxb]

The bullet diameters and weights presented in this list
are based on the use of Taracorp’s Lawrence Magnum
bullet alloy (2% tin, 6% antimony, 1/4% arsenic,
91.75% lead).
Bullet diameters and weights will vary considerably
depending on the lead casting alloy used. This variation
can be as much as 1/2% on the diameter, and 8% on
the weight among the most commonly used casting
alloys. For example, a .358-158 grain bullet might
show a diameter variation of .002", and a 13 grain difference
in weight.
Of the most commonly used alloys, wheel weights (.5%
tin, 4% antimony, 95% lead) will produce bullets having
the smallest diameter and heaviest weight, with
such bullets running approximately .3% smaller in
diameter and 3% heavier than bullets cast with
Taracorp's metal. Linotype will produce bullets with the
largest diameter and lightest weights. This alloy will
produce bullets approximately 1/10% larger and 3%
lighter than Taracorp. Other alloys of tin and antimony,
with antimony content above 5%, will produce bullets
with diameters and weights falling between those cast
from wheel weights and linotype.
Alloys containing little or no antimony will cast considerably
smaller than wheel weights and in some cases
will produce bullets too small for adequate sizing.
Within the limitations given above, the weight and
diameter of a cast bullet can be adjusted by varying the
alloy’s antimony content.
The size and weight of bullets of a given alloy will also
vary according to casting temperature. Higher temperatures
will result in greater shrinkage as the bullet
cools, thereby producing a slightly smaller and lighter
bullet than one cast of the same alloy at a lower temperature

[shootinxd]

Where can I find Lino Type if I really wanted to shed some weight?Yes it is a lee mold,but these are some GOOD lookin boolits if I do say so myself.l most hate to shoot em,lol.

[Rex]

My Lyman 358665 drops almost 8 grains heavy with wheel weights.
Rex

[44man]

The bullet diameters and weights presented in this list
are based on the use of Taracorp’s Lawrence Magnum
bullet alloy (2% tin, 6% antimony, 1/4% arsenic,
91.75% lead).
Bullet diameters and weights will vary considerably
depending on the lead casting alloy used. This variation
can be as much as 1/2% on the diameter, and 8% on
the weight among the most commonly used casting
alloys. For example, a .358-158 grain bullet might
show a diameter variation of .002", and a 13 grain difference
in weight.
Of the most commonly used alloys, wheel weights (.5%
tin, 4% antimony, 95% lead) will produce bullets having
the smallest diameter and heaviest weight, with
such bullets running approximately .3% smaller in
diameter and 3% heavier than bullets cast with
Taracorp's metal. Linotype will produce bullets with the
largest diameter and lightest weights. This alloy will
produce bullets approximately 1/10% larger and 3%
lighter than Taracorp. Other alloys of tin and antimony,
with antimony content above 5%, will produce bullets
with diameters and weights falling between those cast
from wheel weights and linotype.
Alloys containing little or no antimony will cast considerably
smaller than wheel weights and in some cases
will produce bullets too small for adequate sizing.
Within the limitations given above, the weight and
diameter of a cast bullet can be adjusted by varying the
alloy’s antimony content.
The size and weight of bullets of a given alloy will also
vary according to casting temperature. Higher temperatures
will result in greater shrinkage as the bullet
cools, thereby producing a slightly smaller and lighter
bullet than one cast of the same alloy at a lower temperature

Perfect!

[243winxb]

Where can I find Linotype

Rotometal, top of this page. The weight is not that important, bullet diameter is. Just adjust your maximum load down a hair for the more heavey bullets.

[LEADHOPPER]

[QUOTE Where can I find Lino Type [/QUOTE]

Master Printers in Canon City, Colorado. They are selling 100 pounds of lino for $135.00 shipped to your door. There phone number is (719) 275-8608, they will take money order, checks, and credit cards. I bought 200 pounds of it and it is good stuff.

[Mk42gunner]

Not a problem at all. There's a huge amount of of published data available for the 40SW using a 150-155gr lead bullet.

I compliment you on asking questions instead of blindly rushing in.

Like sagacious said start with data for a 155 grain lead bullet.

Robert

[captain-03]

The bullet diameters and weights presented in this list
are based on the use of Taracorp’s Lawrence Magnum
bullet alloy (2% tin, 6% antimony, 1/4% arsenic,
91.75% lead).
Bullet diameters and weights will vary considerably
depending on the lead casting alloy used. This variation
can be as much as 1/2% on the diameter, and 8% on
the weight among the most commonly used casting
alloys. For example, a .358-158 grain bullet might
show a diameter variation of .002", and a 13 grain difference
in weight.
Of the most commonly used alloys, wheel weights (.5%
tin, 4% antimony, 95% lead) will produce bullets having
the smallest diameter and heaviest weight, with
such bullets running approximately .3% smaller in
diameter and 3% heavier than bullets cast with
Taracorp's metal. Linotype will produce bullets with the
largest diameter and lightest weights. This alloy will
produce bullets approximately 1/10% larger and 3%
lighter than Taracorp. Other alloys of tin and antimony,
with antimony content above 5%, will produce bullets
with diameters and weights falling between those cast
from wheel weights and linotype.
Alloys containing little or no antimony will cast considerably
smaller than wheel weights and in some cases
will produce bullets too small for adequate sizing.
Within the limitations given above, the weight and
diameter of a cast bullet can be adjusted by varying the
alloy’s antimony content.
The size and weight of bullets of a given alloy will also
vary according to casting temperature. Higher temperatures
will result in greater shrinkage as the bullet
cools, thereby producing a slightly smaller and lighter
bullet than one cast of the same alloy at a lower temperature

Thank you !! You answered a question I did not know I had!!

[RobS]

Here is an excellent site that will give you a bit of into regarding different alloys and bullet weight/bullet diamter etc.

http://www.lasc.us/CastBulletNotes.htm