Pat, I will of course defer to your expertise I know for a fact you actually do know what you are talking about. Now Pat with that said, I did quite a bit of looking around at the "Pro Top Line" head not to be confused with Procomp. Everything I read says that these heads were in fact China cast and machined in New Zealand. I know abut the Aussie thing and Procomp but I think this is a whole nuther deal.

The problem "I" think and that would be if there is a problem is with the China casting of these heads. In China there is no quality standered, no control by anyone other than the foundry as to what they put in there alloy. One batch will have components XYZ and the next batch could very well be WLS with a little P stuck in there to just make volumn on that batch. No controls what so ever.

As an example: I shoot competively in a sport called BPCRS or Black Powder Cartridge Rifle Silhouette. This is a shooting discipline using the old Single Shot Rifles from the Buffalo Era. One of the requriments of this sport is you must shoot hand cast bullets. I always used a mixture of lead and tin that was 40 to 1. That is 40 parts pure lead to 1 part tin. I bought my alloy from a Co in Oklahoma, City. Lead has gotten very expensive, I was shooting a 45-90 caliber Sharps Rifle and the bullets weigh 680grains each, but me personaly I am staying with what I know for all of my match shooting. However when you are shooting Matches and Practice and shooting 1,000 mininum bullets a week it gets a little costly. So like many other shooters I tried shooting "Wheel Weight" alloy. Well I was spending a lot of time casting and started to feel not so well some of the time right after a casting session. This didn't happen ever when casting my 40 to 1 bullets' just the wheel weight alloy. Turns out that almost all wheel weights today come from China, lead casting on a commercial basis is almost a thing of the past here in the US. I sent a sample of my wheel weight alloy to a lab in Bakersfield to see what was in them. Turns out in the sample I sent there were 118 different chemicals in that alloy. Stuff like Chromum, Arsenic, at least a dozen different types of acids etc, etc. I stopped using them right then and have never had a problem since.

There are no standareds in China like there are here. They may have the best molds for casting heads there are, there designers may be the best in the world I would not know if they are or are not. But without controls or at least some quality control as to what the put in that mold the end product is always going to be a little Iffy.

Roland