I just got back from shooting my Rex-Merrill in .270 Ren for the first time.
There is very little data for 130 grain cast boolits available. After doing a lot of searching and pondering I decided to give 6 grains of 2400 a try. The fired primers did not show any signs of high pressure.
Rex-Merrill .27 Max with 10 3/4" barrel.
Saeco #270 mould at 130 grains sized to 0.280" cast from linotype and old Lyman brass gas checks.
W-W small rifle primers.
6 grains 2400 powder.
TnT lube.
I was very happy with the results at 50 yards.
Anyone looking to use heavier boolits in the 270 Ren this looks like a good starting point.