My guess with the original post is that when a novice is shopping for hide glue, certain suppliers offer different gram strength choices for your purchase.
192g is a general working grade that for the most part you could use for your entire career and it will work well. Gram and bloom strength are most applicable in the glue lab when trying to quantify how this big bucket of wet goop you just made up compares the the last one. In practical luthier applications, it is less important. The best way to get good with hot hide glue is to practice and glue up as many random pieces as you can- and then stress test them to failure....and repeat....Areas like seams prefer weaker connections that neck joints and bassbars would never find acceptable....
There is only one manufacturer of traditional hot hide glue left in the US: Milligan and Higgins. Almost everyone here sells their product repackaged in smaller amounts. The big difference is if the person you bought it from is able to buy it in larger quantities, they can pass the discounted price on to you. The last I checked, John Preston at Old World Tonewoods had the best price in the nation- approx. $8 a pound...
