seating depth and pressure question...


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RugerBob
December 29, 2008, 05:35 PM
Hi all, I am going to try and post a pic w/this. If it does not come thru it will be directly under this post as I am not puter literate. Ok. Here goes situation...I have 3 bullets I am loading for 45LC over 8 grains Unique. I seat and crimp in cannalure. Bullets are 250-255 grains. From Cannalure to base
1-.350
2-.395
3-.372
So, with the bullet sitting closer to the powder, is there that much difference in pressure? The main reason I was wondering is that at a recent cowboy action shoot I was knocking targets off there stands with the one seated deeper. Got a lot of 'what are you loadin'. Well I went and bought a digital scale and also borrowed a friends. Pulled some of my bullets and checked powder dump were 8 grains +- .1. I have one powder dump for CAS and another for my other calibers. Soon I will be out of store bought lead and only loading the deepest of the 3 as that is the mold I have. Opinions please, Thanks Bob

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RugerBob
December 29, 2008, 05:40 PM
http://i266.photobucket.com/albums/ii260/rrmaynard/pro-1000010.jpg

NCsmitty
December 29, 2008, 06:24 PM
So, with the bullet sitting closer to the powder, is there that much difference in pressure?

It should not be anything to worry about as far as pressure is concerned. The differences would be barely noticeable out of the 45LC.
You appear to be within the ballistic bounds for cowboy action shoots with your load, although near the high end. If it is accurate in your gun, keep on using it.
Your competition's probably jealous of your prowess. :)
Max load for regular 45LC and Unique, is 9.5gr from the Alliant site, so you are not getting dangerous pressures IMO.
Let's see what other folks have to say about it.

NCsmitty

RugerBob
December 29, 2008, 06:42 PM
Thanks for the reply NC.

rcmodel
December 29, 2008, 06:49 PM
Lyman #49 shows three lead bullets in the 250 - 255 grain range.

The two 250 gr flat points are so similar it's hard to tell them apart.
But one seats 1.600" and the other seats 1.570"
The third bullet is the 255 gr Keith SWC seated 1.575".

Using 5.6 gr Titegroup:
The three loads get 803, 814, and 816 FPS.

Using 6.5 gr. WW231:
They got 789, 796, and 797.

Can't compare Unique directly, because they used different loads in all three, but I doubt it would be much different.

rcmodel

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