Unique load for 270 gr. Speer

[WTBguns10kOK]

So I made some 240 gr. Deepcurl loads with ~9.3 gr. Unique and they turned out well in my 4" Taurus Tracker.

Now I just can't find the proper info on a starting load for 270 gr. jacketed (still Deepcurls) using Unique. These will also be used in the Taurus as well as a 7.5" Super Blackhawk. The end goal is ~900-1k fps loads that are easy on the wrist.

Closest I found was http://www.reloadammo.com/44loads.htm for 265 gr., and those are max. Is 5 grains of bullet little enough difference that I can drop a full grain and use 8.3 gr. Unique, since Lee's loads for the 240 were 9.3-10.3 gr.? Guess I'm more worried about going too low in grains than high, and I don't fully understand the pressure differences that necessitate less powder for larger bullets.

 

[Sunray]

"...Lee's loads..." Lee gets their data from other sources. Usually the powder maker. They do no testing themselves.
"...those are max..." Just reduce by 10% and work up. 8.3 is 10% less. And no, 5 grains won't matter much. You will notice the felt recoil though. It's physics.
You may want to think about a different powder. There's one 270 grain load on Reloader's Nest. Uses Lil'gun and it's a lot faster than 1,000 fps.

 

[WTBguns10kOK]

Thanks much for the info.

 

[Eb1]

I would try some 2400. I get decent groups with that bullet and 2400 out of a 5.5" Ruger SBH.