I have loaded those Cast Performance 405 WLNGC up to 42.5 gr of RL-7.
Don't know the velocity, but, you will feel that load against your shoulder.
It's not going to 'maim you', but, you'll know that your pushing a hunk of lead!!
Under MY 405 CP WFNGC and 425 BTB PD Jr's loads, I use..........;
According to Lyman 49th Edition manual, page 314 under the "Ruger No. 1 and No.3 Only" it shows a 405 grain, "457193" loaded to COAL @ 2.550"
RX7 (Same as Alliant Reloder 7), 46.0grains at 1785fps and 26,100cup,
I use 46.5 grains also under the 405 CP WFNGC, ( I haven't chrono'ed those yet).
On page 311 under the "1895 Marlin and 1886 Winchester Only" data, Lyman doesn't show using RX7 under the 405
Beartooths data shows his 525P PD's loaded to less than 40,000psi with RX7 with 44.3grains. Personally, I use 40.5grains under the 525 PD.
I personally load 46.5grains ignited by a CCI-200 primer under a 425 PD Jr to 2.545"coal. I'm gettin' 1770fps out of my 1895STP, 16.5"bbl and gettin' tem (10)round shot groups of 1.5" groups at 98 yards.
The ten rounds I loaded showed from 1766fps to 1775fps out of the STP. Smallest ES I've ever seen so far.
Temperature outside was about +34F but the STP and ammo were stored in the house about 65 -70F. Shot within a few minutes after bringing outside to shoot.
USE THE ABOVE DATA AT YOUR OWN RISK. I FEEL COMFORTABLE IN USING THIS DATA IN MY RIFLES. Marlin 1895SBL and 1895STP.
I thought mike64s 46.5gr RL7 425gr bullet load sounded to hot. So today I surfed around the net looking for loads. I did not find any data showing loads that high. I did find guys using even hotter loads. 48 and even 50grs of RL7 with The 425btb. In Marlins
Where are folks seeing this kind of data?
however according to the drawing in the pdf, it shows .600" of his 425 grainer inside the case.
My 425 PD's are .570" into the case.
I haven't measured anymore case head expansion than factory Remington ammo. Actually, my Starline cases measure .4995 at the case head with new cases bought from MidwayUSA about a year ago.
I will say that she's a real thumper at my shoulder though but both my 1895's group under 1.5" with ten rounds at 98 yards. Yes, ten rounds, I use that many when I chronograph you get a average velocity.
Out of my STP 16.5"bbl, I'm gettin' 1770fps average and my SBL 18.5"bbl is gettin' 1836 with between a 9 or 10fps from highest to lowest velocity spread.