SL, you don't have to speed up the twist to shoot the heavier PR bullets and i know for "certain" you already know this. if not go to the site,they were tested in the 1:28 & 1:30 with up to 150 gr loads
you also do not have to shoot a naked .45 cal bullet..40 cal lead jacket bullets in the .220-.250 gr range can be produced and still not be to long.the PT gold design is a perfect example of how you can increase .40 cal weight and still not be to long for the twist.it's all about the length and not the weight. there are people on this forum who have shot the .40 cal PR bullets with excellent accuracy. the only problem with them is the lack of plating and the astronomical price they want for non plated bullets..i covered the cost effectiveness of bullet VS rifle in one of my responses earlier and without any doubt, it's much more cost effective to develop a bullet,than a rifle and twist that may not sell. only problem i see is Lehigh bullet promotion can't be advanced
nuff said!!!