>>63982751
>>63982969

To continue, if we look at rifle fired HEAT grenades vs later rocket propelled or disposable black powder tube launched HEAT warheads introduction time and compare that to the ever increasing number of more heavily armored tanks on both fronts
>T-34, KV-1 variants and later T-34/85 and IS heavy tanks on the eastern front
>Shermans, churchills and cromwells on the western front
>All having depending on version 70-100mm frontal protection with some late war heavy tanks having from 100mm to almost 200mm of frontal protection and roughly 80~100 side protection

The panzerfaust and panzerschreck are the only weapons that are gona be effective for the germans when dealing with allied armor. You need 160mm-200mm of penetration to deal with allied armor, even with a less then ideal hit rate in combat you are better of with a panzerfaust then a rifle firing the gross panzergranate 61 just for the chance to kill a tank, from the front hitting the tickest possible spot. Rifle grenades just cant compete without going really silly wide heavy caliber grenades for that time period.