Rimrock .357 lswc BE86

[Big-bore-bob]

Hi all, I just ordered 1600 rimrock 158gr lswc for my 686 smith. I've had some suggestions on the forum that 7.3gr be86 is a good load for a mid-range .357 using an extreme 158gr plated swc. Will plated load data work for lead bullets in this caliber with this bullet? I can only find data from alliant for a jacketed bullet with a maximum load of 7.8gr be86. Will the standard 10% reduction from this maximum work for a lead bullet work up? I'm just looking for a lighter plinking load that wont lead up my barrel or forcing cone. Thanks in advance for any advice!

 

[Ohen Cepel]

2021 Alliant manual says max of 8.1gr BE86 for a 158gr cast RNFP which should be similar. They don't give a starting charge.

Do you have other power options than BE86?

 

[Big-bore-bob]

Do you have other power options than BE86?

Yeah I have hp38, cfe pistol, bullseye, and power pistol, however I have a keg of be86 so I kinda want to find a good load with that powder. I'd like to save the bullseye and hp38 for 38 special and 45 acp. And the power pistol is for accuracy loads in my 9mm's.

 

[Blue68f100]

Hi all, I just ordered 1600 rimrock 158gr lswc for my 686 smith. I've had some suggestions on the forum that 7.3gr be86 is a good load for a mid-range .357 using an extreme 158gr plated swc. Will plated load data work for lead bullets in this caliber with this bullet? I can only find data from alliant for a jacketed bullet with a maximum load of 7.8gr be86. Will the standard 10% reduction from this maximum work for a lead bullet work up? I'm just looking for a lighter plinking load that wont lead up my barrel or forcing cone. Thanks in advance for any advice!

It should work, but be careful of low power loads. Lead can be loaded down loaded more than a plated or jacketed bullet. It all depends on the core and jacket. In a lot of cases some mfg tells you to use lead data where others tell you to use low to med jacketed. Then there are some that say to use jacketed. Most all plated has a max velocity that you need to stay under.

 

[Charlie98]

extreme 158gr plated swc.

Xtreme plated bullets are pretty sturdy... I run them in my .41MAG at near Magnum velocity, and they are fine. I would not do that with some other plated bullets.

2021 Alliant manual says max of 8.1gr BE86 for a 158gr cast RNFP which should be similar. They don't give a starting charge.

I believe there is a note somewhere in Alliant's data that says reduce that max published charge by 10% to start... so the OP's plan to reduce by 10% (from 7.8grn) is a reasonable plan. I would start at 7.0grn BE-86 as a tester, and work up pretty directly.