Splain this to me...What are you limiting to SAAMI specs...both..or just the 30-30...? If both are limited to SAAMI specs...the 30-30 will win hands down..If your talking about running the 45LC at 42,000psi..and limiting the 30-30..then yes..the bigger heavier bullet at near the velocity of the lighter bullet will win.....I thought the 30-30 was 42,000PSi..http://www.lasc.us/SAAMIMaxPressure.htm..Let's see...the 45LC SAAMI rating is 17,000 PSI...the 30-30 is 42,000psi...Your raising the threshold up by 25,000psi on the 45LC...but limiting the 30-30..is this correct? Mac
Surely.

I prefer to only talk in CUP. PSI confuses too many people. Copper Units of Pressure is a standard.
The 30-30 is loaded to 38-42,000 CUP. The 45 Colt is loaded to 14-16,000 CUP.
http://www.leverguns.com/articles/saami_pressures.htm STD loadings, neither hot rodded.
The 30-30 was brought about as a rifle round, in 1895. Designed for a stronger action. (For its time) The 45 Colt, in 1872 and for a revolver.
IMHO, this topic comes to be because of the popularity of these two grand old calibers. (Specifically for us, because the 30-30 is a GREAT handi caliber. Then the beautiful little H&R carbine chambered for the 45 Colt is gaining popularity and so here we are.) The 45COLT has maintained popularity for a number of reasons. Being chambered side by side with the 41 & 44 magnums. Its only a natural thing for people to surmise it could be loaded to identical pressures as the other two. This is of coarse NOT TRUE. But its NOT NEEDED to attain like or even better performance than the other two. Mostly because the 45 is capable or more capable with heavier bullets than the other two.
I am proposing that if the 45 Colt where designed with the same mentality of when the 30-30 was designed. It might have been loaded to 40,000 CUP as well. That being said, its performance would be greatly improved. Its loaded SO lightly for today’s firearms it’s a natural for loading it up.
I don’t wish to take anything away from either caliber. Each has many, many excellent attributes. People feel strongly about each. The fact is neither is really better than the other taken at face value. BUT if we are talking white-tailed deer hunting. The 45Colt loaded to even 30,000 CUP is hands down the winner up to 100 yards. Now the 30-30 is in no way a long range caliber in the world of 30/378 magnums. But in our little comparison and considering Hornadys lever evolution rounds. Its certainly is!! It literally trounces the Colt beyond 100yards. The 45’s large diameter and heavy for caliber bullets FLATTEN GAME. Just as pointy stream lined bullets hold there energy, drop and drift less as the ranges stretch.
Long story, short. I am merely proposing loading BOTH to the same pressures and taking them at face value…

CW