I can't tell you load data off the top of my head, I am on the road. But I have had great results with Lil'Gun in my .357 rifles. You should be able to get around 1700 FPS give or take.

I've always used jacketed bullet data for gas-checked bullets to start out, and made any adjustments as needed.

That should give you some peace of mind.

In the old days Sierra made a 170 FMJ and Hornady made a 180 FMJ, both for the IHMSA silhouette shooters, so load data should be available for them. My understanding has always been that lead bullets have less pressure than jacketed.

I think your biggest challenge is experimenting to find the proper cartridge length to function in that action and still not take away too much of your powder space.

I use 12.9 grs. of 296 with Cast Performance 180 gr GC WFN.

Tom, I have used 2400 with that bullet. I start around 12gr and stop around 13.5gr or so, depending on lot density. Using the Lee Pro Auto Disk volumetric loading I start over every time, using the .88, .95, and 1.02 CC settings. Mid level loadings are fine, as with the hotter loads I have managed to bust the bolts off my targets a few times.

Tom, I used to load a WFN style of 180 gr gas check and now use my own heavy cast swc-gc that run around 190. I forget the load right now and about 140 miles from my loading notes, but I know it's a full grain under max from the Hornady loading manual/magazine with Lil Gun. I get very good velocity and accuracy. Killed my first two deer with a soft nosed version of that bullet. I'm loadin for a Rossi '92 as well. Lil Gun seems to give higher velocity and lower pressure than most comparable powders.