poor performance with cast bullets

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poor performance with cast bullets

Postby 3sharps » 25 Dec 2018 20

I have 2 Rossi and 1 Henry rifles in .357 magnum. I get good accuracy in all of them with jacketed bullets. When I load cast bullets my groups open up to 8 -12 inches at 100 yards. I slugged one of the Rossi barrels and it measure .355. My cast bullets are .356 to.357. Bullet weight is 150 grain. I have tried lubeing them and powder coating them. My best jacketed loads are with 15 grains of 4227 powder. I have tried 30/1 alloy and wheel weights. Nothing seems to help. Can anyone point out my error?
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Re: poor performance with cast bullets

Postby Ranch Dog » 26 Dec 2018 06

How about a bit more info about the bullet; is it gas checked or plain base? Also, what about the nose profile?

Also, how are the two alloys withstanding the trip down the barrel? You sure the barrel isn't leaded up?

I have the same groove diameter, had two rifles both the same, and size the bullets at .357". I'm using a 175-grain and 190-grain bullet with a nose profile that matches the throat very well. The bullets are gas checked, cast with 95/5 wheel weights/tin, and they shoot exceptionally well. I push them hard to get past the twist rate of Rossi barrel (30).
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Re: poor performance with cast bullets

Postby Ohio3Wheels » 26 Dec 2018 13

My 357 20" runs the same on groove diameter and shoots my home cast Lyman SWC gas check 158 +/- okay when pushed a little bit. Moving up to 180 grain commercial cast (Penn and Shamrock) and pushing with a stiff load of H110 with factory sights and these old eyes it will hold 3.5 to 4.5 at a hundred. Since it will stay under 2 at 50 I'm thinking it's mostly the eyes. We'll see when I get a tang sight on it. My available out door 100 yard ranges are closed for the season and/or remodeling so it's going to be March before I'll be able to do any more testing.

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Re: poor performance with cast bullets

Postby GasGuzzler » 27 Dec 2018 06

There's at least five powders I'd use in .357 before 4227. Not saying that's the issue but...
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Re: poor performance with cast bullets

Postby Ranch Dog » 28 Dec 2018 06

GasGuzzler wrote:There's at least five powders I'd use in .357 before 4227. Not saying that's the issue but...

My thoughts as well, but I'm not sure what he is trying to do with the bullet's velocity. It will never generate the RPM I think is needed. I want to see about 40K rpm from the 30 twist (1700 FPS).
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Re: poor performance with cast bullets

Postby GasGuzzler » 29 Dec 2018 05

In no particular order...

2400
W296
H110
Lil Gun
300-MP
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Re: poor performance with cast bullets

Postby 3sharps » 29 Dec 2018 11

Okay, I have about 4 pounds of 4227 to use up. I can get good groups with 158 grain Hornady bullets. When I switch to cast bullets my groups more than double. From what you are telling me I need to get up to near maximum loads. I do have some tight group powder.
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