If a manufacturer is willing to pay the money, their is little to be gained from a forging that can't be equalled or bettered by a casting. For years I worked with cast steel products that would routinely exceed 110,000 psi, they replaced the forged products that were only rated at 75,000 psi and they did it cheaper and faster. Its called science and progress.
Any casting that I have seen that was stronger than a forging was due to the fact that is was given a higher heat treatment and made thicker. When comparing apples to apples there is no casting made that I am aware of that is anywhere near the equal of a good forging.
In industrial catalogs the same thickness and heat treated forging is rated at 2 1/2 times the strength of a casting if both are the same thickness and both have the same heat treatment.
In the past I have had nothing but nothing but trouble with castings as used in firearms. The latest scourge of the gun industry is the dreaded MIM casting that has proven to be very brittle and has an extremely high failure rate.
I have found castings often shatter when subjected to sudden impact, unlike forgings that can be made hard on the outside and softer on the inside to take a lot of pounding and stress. All the castings I have seen are the same hardness all the way through.
Extreme cold seems to make some castings even more brittle than the are by nature.
If there are top quality castings the gun industry certainly isn't using them and as I have said the latest use of the MIM castings has been a real scourge on the gun owners that get stuck with such sub-standard parts. Most throw them away and pay big bucks replacing them with custom made forged parts.
The forging can be made much thinner and lighter than the casting and still be as strong as the much thicker casting. Smith & Wesson themselves advertised this about 25 years ago when they got into a big row with Bill Ruger. Since that time of course time has marched on and now Smith seems to make nothing but castings and is reported to be the one that supplies all the MIM cast internal parts for Kimber ( which have had a very high failure rate). The frames and slides are supplied by Caspian and are reportedly made from bar stock. Most of the internal parts on Smith Revolvers are now MIM and no hand fitting or machining is done on them. I have read on the net that on the Smith & Wesson forum everyone is screeming about the poor trigger pulls of new Smith Revolvers and the pedestrian accuracy of their new revolvers compared to the older quality pieces of not so long ago.
I have had an M1a recieiver stretch that was made of a casting with only 200 rounds fired out of the weapon. I have read on the net and seen pictures of many of the new M1a's suffering a high failure rate with the internal parts that are now castings instead of the forged G.I. parts that were once supplied with their weapons.
I have had a cast op-rod break on an Iver-Johnson M1 carbine that had only 500 rounds fired through it, and when it was replaced by a G.I. forged op-rod the gun never had any further problems with cracking an op-rod.
I have seen parts like automotive bell housings crack when dropped only a few feet onto a concreate floor and in contrast I have seen forged automobile parts hit the concreate so hard they bounced 3 foot into the air an suffer no damage.
I once dropped a H&R revolver on a soft pine wooden floor and the cheap cast rear sight broke right off and in contrast I have seen revolvers and automatics with forged rear sights dropped onto concrete floors and only suffer minor scratches.
Cast parts also just plain look hideous because of their porosity (air holes).
Cast parts rust much faster than forged parts. I recently examined a cast Rossi pump .22 that had a rust hole eaten right through the reciever. I have never seen this happen with a forged reciever. As a matter of fact that day I looked at some Mauser Broomhandle pistols that came from China and were at least 85 years old and probably never had a drop of oil put on them. They had light rust but no severe damage like the rust hole in the Rossi receiver that by the way was only a few years old.
The big myth is that when Gun companies use sub-standard parts it keeps the price of the weapon down so that it is still afforadable to the consumer. Again nothing but propaganda. The real truth is that the gun compaines push the prices as high as the market will bear and by using cast parts, stamped sheet metal and plastic they make astronomically higher profits while still keeping the price as high as possible. They could very well make the same weapon of quality forgings but it would cut too much into their profits and of course any handworkmanship is defintely verbotten because it too would cut to much into their profits. For example even the gun rags are now letting the truth out. The Browning and FN High Powers which were once known for their outstanding accuracy now give 3 inch groups and larger because there is no hand fitting of the barrel to the slide anymore.
In the old days gun companies were family owned and pride in their product in regards to quality workmanship and quality materials were paramont. Today with most of the Gun companies being corporate owned the managers must show a profit to the stockholders and the quality of the product is not even considered because it is well known that all the compaines are pretty much in the same racket of making a product as cheeply as possible to maximize the profits. So there is not much competition from any other compaines that are willing to make less profit but put out a quality product.
All this is why the custom built handgun has become such a big and booming buisness. People know that when buying the factory mass produced product that they are not getting a quality product like they came to expect not so long ago.
I'll pass on anything made of castings if I can help it. And I am not fond of plastic and sheet metal either. I have owned the best of the older made weapons and I am under no illusion in regards to the quality of weapons made of castings, plastic or sheet metal.