Equivalent bullet data

[Imageview]

Hey folks,

As a newer reloader, so far I've been very careful to stick exactly with recipes in books including the exact bullet utilized. Checking around online today I noticed Speer 158 gr for 38/357 are super cheap, and I'd like a heavier bullet anyways.

The Speer manual has data, but not utilizing the powder I want. The hogdon site has the powder I want, but for the xtp 158 gr. The load data for other powders is pretty close, including h110, universal, and 231.

My gut says it should be usable, but my desire to keep my fingers permanently attached to my hand is a bit more cautious. What do I look for in a comparable bullet to ensure I don't screw it up too badly, especially as a new reloader?

[Imageview]

To clarify its the Speer gold for in 158.

[pacrat]

Bullet Manufacturer makes no difference.

Bullet weight/type is primary factor consideration due to pressure variances.

A Speer 158 gr JHP with a given powder charge. Will generate the same pressure as a Sierra, Hornady, etc 158 gr JHP. And result inthe POI at same range.

[JagerDog]

Bullet Manufacturer makes no difference.

Bullet weight/type is primary factor consideration due to pressure variances.

A Speer 158 gr JHP with a given powder charge. Will generate the same pressure as a Sierra, Hornady, etc 158 gr JHP. And result inthe POI at same range.

I'd add a caveat, though I doubt it's needed between these 2 choices.

Pressure is largely a result of case capacity. So if the 2 bullets have the same amount of engagement with the case (similar bullet length and COAL), then pressures are going to be very similar.

[hambam105]

Make sure you don't use jacketed bullet max loadings with a cast bullet.

[robert101]

I don't agree that bullet manufacturer variation will result in the same pressure values. Why? Because bullet design can be different like base configuration (cupped or flat), thickness of copper casing, sidewall surface and bullet to barrel contact area. Follow the same bullet type and then you can approximate the load data. As always, start low and work up to be safe.