As a long time user of South African PMP ammunition - both on the target Bisley range as well as in hunting everything from eland to springbok I can attest to the quality, consistency and accuracy of it. The earlier PMP soft nose bullets have had a slightly too thin jacket for us meat hunters and above 2 400 ft/sec impact velocity mushroomed too much and cause unnecessary meat damage.
Their "Pro-amm" series must be the most accurate hunting ammunition commercially available, and with excellent bullets. I believe their .222 Rem and .308W share the world record for grouping at 100 yds. (the .222 was shot by a schoolboy of 16 years old, - shows you what good eyes do!)
Although it is Berdan primers on your ammunition they are non-corrosive. Indeed 55 gr, as you have assumed.
One day I'll own a Remington Model 8 / 81 in .35 Rem AND a Browning lever in Krag 30-40 AND an older Marlin in 45-70 AND a 1903 in whatever..