Author Topic: Why are they heavy (Read 583 times)

Nikkisdad · « **on:** December 28, 2003, 02:29:44 AM »

I just started casting, using a Saeco 745 mould, 525 grains. I weighed the bullets and they are approx 10grains heavier then what the mould is supposed to put out. Is my alloy screwy or what? Would adding tin to the mix lighten the bullit or??? I am trying to start with a 20 -1 mix for black powder cartridge sharps rifle shooting. Thanks in advance, Manny

Ka6otm · « **Reply #1 on:** December 28, 2003, 05:34:25 AM »

Relax, they're only 2% heavier than nominal.

This won't hurt anything and is nothing to worry about. Your alloy is probably slightly different from the one that Saeco used.

Ka6otm

cooper · « **Reply #2 on:** December 29, 2003, 05:11:03 AM »

Nothing to worry about. Many moulds seem to be that way. Part of it may be that alloy the company used to determine the weight.

My Lyman #457125, the Government round nose 500 gr., comes out at 515 gr in 20:1. My PJ Creedmoor 420 gr comes out at 416 gr in 20:1. My 400 gr RCBS 40 cal comes out at 408 gr, and I've heard of others as heavy as 415 gr.

If you add more tin, you will only make the bullet a couple of grains lighter.

Castaway · « **Reply #3 on:** December 29, 2003, 05:46:31 AM »

I suspect if you had used Lyman # 2 or equivalent alloy, even thought it's a Saeco mould, your bullets would have been very close to the advertised 500 grains.