Discussion in 'Handloading and Reloading' started by swampgunner, Jun 14, 2021.
Yes, you will be safe. If you approach maximum load for the 150gr with 155 gr bullets, stop about a .3-.4 gr short of what Lyman is saying for maximum load, just to be safe.
Most lead bullets you buy from commercial casters don't weigh what the box says they weigh. The .357 mag lead SWCs I buy for 158gr can weigh as much as 161grs, that's just the way it is.
So you just have to get use to this, you just need to worry about the max load for the heavier bullets, not the minimum.
I bought 1500 SWCs from a commercial caster and my standard practice is with any shipment of bullets I receive is to weight about a fifty of them to see what the extreme spread is for the bullet weight.
This shipment I received has a weight spread of 10 gr. This was for 9mm which is high pressure like your 10mm is, so these bullets are a no go.
2 or 3 grain spread, I'm not going to worry about to much.
I called the company I bought these from and told them I couldn't use them, they were suppose to be 124 gr and some of them were 134gr.
They refunded me and sent me a shipping label to send them back so they could use them for a training session for what you don't do when casting bullets, with their new employees.
I would suggest you adopt this practice also to protect yourself, especially in times like these when the casting machines are running 100% plus and not keeping up with demand.
Don't blindly accept that these bullets you bought weigh 155 gr. Verify for yourself that they are within, say, 3 gr of what they are supposed to be, and not more than that.
...so you may want to seat at various depths and taper crimp a handful of dummy rounds to check function before priming/charging and potentially pulling a bucket of bullets.
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