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Antimony makes bullets larger in diameter. https://www.thehighroad.org/index.php?media/weights-diameters-test.4081/full

"the 3 original balls weighed 5 grains more than the new mix of 3 balls. "

You added antimony and/or tin, making lighter balls.

Chilled shot is soft compared to magnum. Your chilled will need antimony & tin added. (Linotype)

The magnum shot can be used as is, if oven heat treated & water cooled. I have test fired it.
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Cycle the press as if loading shells. Then check powder drop weight. The shaking & vibration will settle the powder in the bushing.

Make sure the loaded 38 rounds COL is not to long for your cylinder.

My S&W 357 M28 may not chamber long bullets.

This looks like a winner? Have not loaded it.

https://www.midwayusa.com/product/1010245557?pid=743639

Note that factory 9mm 147 gr bullets have a long boatail. This helps avoid the bulge that keeps ammo from chambering. The bulge at the bullets base, after seating, should be avoided.

Find a cast...

Less pure lead. More antimony. Must have a little tin.

Mold to hot.

1,167°F to melt antimony. Lee pots dont go that high.

Forget holes. The cast bullet has to go deep into the die to size to the correct diameter.

The start of the die is tapered. Sizing happens lower in the die.

Includes all types of bullets.


From Steves Pages for 115 gr bullets.

HS-6 From 5.5 grains to 7.5 grains

Unique From 4.4 grains to 7.0 grains

Undersize bullets.

The mold is designed for pure lead. I found harder alloys made it near impossible to get slug out of mold.

2% minimum antimony is required for oven heat treat, water cool to harden.

The...

I would have turned heat* down to 8, wait 5 minutes, then flux & clean stuff off top.

Harder alloys group better, when pushed hard. Less slump & skid.

https://www.nationaltarget.com/product/b-2/ NRA B-2 targets

All in the black @ 50 feet, ok load. Score higher then 85, great...

Tumble lubed/lee iquid alox builds up in the seating die. Changes COL. https://support.leeprecision.net/en/knowledgebase

All cast can be TL.

For 9mm Luger, i like this one. - 356-120-TC...

https://stevespages.com/ The page8a link above, works for me. The main sight is not free.

Google search found this. 44-40. 700X

Lyman Cast Bullet Handbook 4th Edition, 2010 on p.268 lists 7.9 grains of Unique as max. with 205-grain #427098 at 1.59" OAL for 962 fps @ 12,700 cup....

Bullseye for handgun tells me 700X can be made to work in rifle. Avoid startig loads.

Bullseye is faster the 700X. I have used both powdes in 38, 45acp pistol loads.

Starting with 5.5...

https://stevespages.com/page8a.htm

700X will be done burning after bullet movement. A long rifle barrel will induce more friction, slowing the bullet futher down the barrel.

A starting pistol...

https://www.thehighroad.org/index.php?media/albums/taurus-g3c-9mm-luger.317/

Start with RCBS dies. Measure for correct bullet diameter.

Trying to lead the barrel with a very hard alloy. After 200 rounds fired, accuracy was normal. Normal cleaning with #9. Wet, soak to next day. Wet brush, patch out. Done. 45 acp in S&W 645....

I compared air cooled vs mold to water 45 acp bullets. Same alloy, same day. Alternating 1 air dry, 1 water dropped. Shooting for score @ 25 yard, NRA Bullseye style. About 100 rounds each.
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I add linotype & air cool. Just playing with the oven heat treating. I test bullet hardness using my thumb nail. If i can mark the bullets, its too soft.

Bullets can NOT be to hard, only to...