Questionable reduced loads with slow rifle powder. Should I be concerned?

[SKS50]

Lyman reloading manuals of which I have #45,#48 and #49 as well as the Lyman Cast Bullet Manual list quiet a few loads for the 54r as far as reduced cast bullet loads go. I prefer the fast to med fast burning pistol and SG powders

My M44 gets a pretty steady diet of the Lee 165 gr. tumble lube GC RN bullet using the Universal Load of Alliant 2400 and The Load of Alliant Red Dot in military style cartridge cases like .30-40 Krag, .303 British, 7.65 Argentine, .308 Win., 7.62x54R Russian, .30-06, 8x57 and .45-70.

I shoot both loads in my M44 with great success but I prefer the 2400 because I can use it with cast loads in my 7.62 x 54r,7.62 x 39,300 Sav. and my 30-30. MV runs anywhere between 1400 fps. on the low end with 170 gr. cast bullets up to 2K fps. depending on which cartridge I loading. I throw all the charges for these cartridges basically with my Lil Dandy powder measure and 3 rotors,you can't get any simpler than that.

Alliant 2400 according to Mr. Harris who wrote the NRA Cast Bullet Manuals and supplements stated that 2400 or Red Dot is neither case capacity or position sensitive when used with the prescribed load data,meters great,burns cleaner in the longer rifle barrels and has a good bit of latitude especially the 2400 to allow you to work up an accurate load.

The Load
http://members.shaw.ca/cronhelm/TheLoad.html

Cast bullets in military rifles.
Cast Bullet Loads for Military Rifles - Article - Cast Boolits

My first 5 shot cast bullet group at 50 yds.