On a Garand you would use a clip to load the magazine because it's much easier that way.
If you are going to correct usage, please get it right.
The en-bloc clip is the ONLY way to shoot a Garand as a repeater, not just "much easier".
Using a stripper clip to load the magazine on a Johnson, etc. calls for some hand strength and technique, it is quick but only if you can do it right.