Dacron was what I was advised to use but never did as a Magnum primer was another option in light loads.
Never had the need to use it in handguns... yet.
Would also be curious as to any accuracy improvements.
We use 45 Colt in a BlackHawk and a Win '92.
44 Mag in a 629 and Win '94.
Grandkids will appreciate learning with light loads.
TrailBoss is great stuff.
458 Win Mag light loads of 3031 and our most often used 4198.
With 50gr and 55gr of 4198 I use a LR Magnum primer.
At 60gr up to the low 70gr charges I use regular LR primers.
Bullet is a 300gr jacketed Sierra.
Hope the 458 WM above is useful if you move up to the
Adult calibers.
The progression from 50gr-70gr+ is for teaching how to shoot a No.1H before going up to the 500gr bullet weights.
In four decades of range fun, no one has asked for another.