Bob Nelson 35Whelen
AH ambassador
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GerryShootist43, thank you kindly for your input , it is much appreciated...the only reason I am looking at this AI Improve is as follows:
I can buy a AI Improve reamer for the same price.
The real advantage of an AI Improve system is that the barrel life is increased, chamber lower pressure ...
Here is some info by another member on a forum" Don't forget though, some of the best benefits aren't on the performance side but have to do with increased barrel/throat life, longer case life, and more consistent burns. All very good things in addition to the potential velocity gains. And with the PO you can shoot the standard cartridge in the new chamber to fire form and usually still get fine accuracy. With Ackley improvements the datum line stays the same for head-spacing. This makes fire forming very easy and also allows the use of store bought ammo if needed.
Sources indicate that you can only expect about 12% increase in muzzle velocity...which is not much , the advantages in a longer barrel life makes it an exceptable issue to me ..
I don't know where you got the 12% from but the rule is for every 4% increase in powder you get a 1% increase in velocity. Usually AI cartridges get 50 to 150 fps gains in velocity.
Cheers
Bob