.38 Special Load data for 125gr RNFP Plated vs Lead

[Stormin.40]

Have always assumed that I could use the same load data on plated bullets as I do with Lead, at least as a starting point. I recently worked up a light load using 125 grain Lead RNFP bullets, I settled on using 3.4 grains of Titegroup due to accuracy and light recoil. I also have some of Berry's 125gr Plated FP bullets that I was going to load under Titegroup as well but noticed that Hodgon list 4.3gr of Titegroup as the start point for Jacketed FP, that is a HUGE difference with a fast powder like Titegroup.

Why such a difference from Jacketed to Lead? I assume it has something to do with the friction of soft lead to copper jacket but was curious. The 2 bullets in question are very similar in profile and have almost identical OAL, an increase of .5 grains of titegroup from Max. to Min. load is a big difference.

For reference the Hodgon data is listed as follows:
125gr Cast LRNFP - 3.2 -3.8gr Titegroup OAL: 1.445"
125gr Jacketed FP - 4.3 - 4.6gr Titegroup OAL: 1.450"

 

[rcmodel]

Jacketed or plated bullets have more bore friction then grease lubed lead bullets..

Lead bullet Starting loads may be so light as to cause stuck bullets in the barrel.

If you read the FAQ on Berry's web site, they tell you to use low to mid-level jacketed bullet data with their bullets.
http://www.berrysmfg.com/faq.aspx?n=327150

rc

 

[PO2Hammer]

I've found that plated bullet loads match the speeds listed for Hornady's jacketed bullet data.

I use jacketed data starting points for plated bullets because I did stick a plated bullet in the bore of a revolver once using low end lead data.

 

[MGRAY]

Been shooting 125 rnfp with 3.2 g tite group in my 6" gp100. Very happy with the accuracy and super low recoil. MG