Jack,

my determination of Rem Managed Recoil using IMR 4198, came from two sources....and if It isn't 4198, its something else that has the same burn rate range.....

First was chronographing one... then took the velocity and bullet weight into account... and then checked on some of the older reload data around for 4198 in a 270...36 grains of 4198 was listed as 2500 fps...

I use a lot of 4198 loads of 30 grains in calibers from 243 to 30/06 for lower recoil for kids to use...with 30 grains of 4198 in a 270 with a 130 gr bullet runs right in the 2200 to 2250 fps range... which sorta verifies the fact that 6 grains more would yield about the 300 fps more...

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez