schmeky
Member
I know there is a sticky on this, but I have not been able to find what I am looking for. This pertains to a 1911/.40 project, specifically a match barrel install.
The new Kart barrel I purchased was throated for FMJ style bullets and had a very narrow throat. The angle was also quite steep. The edge of the ramp was approximately even with the frame's ramp after the barrel was fitted; the barrel locks up very well.
I feel my ramp angle is to steep and have more 3 point jams (with no extractor) than I would like. The rounds do not chamber as smoothly as I would like, emitting that "ka-chunk" sound most of the tme. I am using a Colt factory .40 mag.
The ramp angle is approximately 15 degrees. I cannot find any info in Kuhnhausens manuals on an approximate ramp angle. I have checked my other 1911 ramp angles and they are around 22 degrees.
I have approximately .075" of the case exposed presently. I fear if I increase the angle 6-7 more degrees, I will expose more unsupported case as well, potentially leaving about .090-.100 exposed.
What is the optimal ramp angle in degrees? Will I have an unsafe barrel if I wind up with .100" of the case unsupported? The .40 operates at a higher pressure than the .45, but I "assume" the webbing of the .40 is thicker, thus having a greater saftey margin.
The new Kart barrel I purchased was throated for FMJ style bullets and had a very narrow throat. The angle was also quite steep. The edge of the ramp was approximately even with the frame's ramp after the barrel was fitted; the barrel locks up very well.
I feel my ramp angle is to steep and have more 3 point jams (with no extractor) than I would like. The rounds do not chamber as smoothly as I would like, emitting that "ka-chunk" sound most of the tme. I am using a Colt factory .40 mag.
The ramp angle is approximately 15 degrees. I cannot find any info in Kuhnhausens manuals on an approximate ramp angle. I have checked my other 1911 ramp angles and they are around 22 degrees.
I have approximately .075" of the case exposed presently. I fear if I increase the angle 6-7 more degrees, I will expose more unsupported case as well, potentially leaving about .090-.100 exposed.
What is the optimal ramp angle in degrees? Will I have an unsafe barrel if I wind up with .100" of the case unsupported? The .40 operates at a higher pressure than the .45, but I "assume" the webbing of the .40 is thicker, thus having a greater saftey margin.