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

[Pyno&dyno]

The VV N110 has its own problems. Main problem is that it is easy to do a double charge, which caused the completely destruction of a nice M38 Swedish rifle from a comrade.

I agree, but the same can be said for all the "pistol" powder used in long gun reloading.
Did you guys ever compared the speed of reloads using filler as opposed to reloads without? I mean, does the filler really help to keep the SD of the reloads lower?

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Parashooter]

Did you guys ever compared the speed of reloads using filler as opposed to reloads without? I mean, does the filler really help to keep the SD of the reloads lower?

Yes, SD's were usually lower when I used filler (polyester fluff) - but I can't see any difference in the groups at short-range (100-200 yards). I'd probably use the fluff if I were shooting mid/long-range with a large straight case like .45-70 or medium-bore mild bottleneck like 10.4x38R. For smokeless-era cartridges, I'm inclined to trust C.E. Harris' advice -

"Do NOT use inert fillers (Dacron or kapok) to take up the excess
empty space in the case. This was once common practice, but it
raises chamber pressure and under certain conditions contributes
to chamber ringing. If a particular load will not work well
without a filler, the powder is not suitable for those conditions
of loading."