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25-20 S.S. a morning at the range (Read 1866 times)

TDW Full Member Offline Posts: 123 Location: Montana and Missouri Joined: Mar 21^st, 2010	25-20 S.S. a morning at the range Oct 2^nd, 2011 at 12:17pm	Print Post
	A beautiful day for some serious shooting with the low wall. Perfect conditions and I had the place to myself. I had just 25 rounds left of the B.A.co, .257dia., 87.7 gr. bullets. I only weighed two or three as they are pre-lubed with SPG. They were styro packed, but some had some flaws that I would normally have thrown back in the pot. All bullets were seated out to engrave the first driving band about .025. Still working on fixed load development, I set my bench up at 25yds and then out to 50. I had previously tried 8.5grs. of IMR4227, but was getting some minor tipping. The load today was 8.6grs., showed good grouping and no tipping at 25 or 50yds. Groups are between 1 to 1 3/4 MOA (except for the eternal vertical flier ). No signs of pressure. All in all, I'm happy so far. With the smokeless loads, I have noticed some lead deposits on the neck of the cases. It seems to be bonded to the case as tiny droplets. These droplets have to be physically removed, as they didn't come off in the tumbling process. I have not had any leading in the bore and accuracy is very good. I have been using the same 25 cases and have been neck sizing only. This is the 4th loading of this brass. Has anyone seen these "leaded" necks before? Is this an annealing issue? Thanks, Tom

	"The farther North you go, the more things you will run into that will eat your horse." S.P. Garbe, Absaroka-Beartooth Wilderness, 1980
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w44wcf Participating Member Offline Posts: 43 Location: Erie, PA Joined: Apr 24^th, 2008	Re: 25-20 S.S. a morning at the range Reply #1 - Nov 2^nd, 2011 at 9:03am	Print Post
	TDW, Thank you for the report. The only time that I have seen lead deposits on the outside of the case neck is when I was experimenting with cast bullets in my 22-250 that had previously seen close to 7,000 rounds of jacketed. I really scratched my head over that one since I had fired thousands of cast bullets in other calibers but had never witnessed it before. I eventually discovered that the reason for the leading was that the throat diameter had increased to an oversized .232"(!) from .225" through the course of firing those close to 7,000 rounds. The gas was getting by the bullet in the throat and was depositing the lead on the outside of the case neck. Accuracy was like 3-4" @ 50 yards. The solution, I found, was to use a .06" poly wad under the bullet in as fired cases. Groups at 100 yards then ran in the 1 1/2" range. No more leading was seen on the case necks. w44wcf

	aka Jack Christian "I can do all things through Christ who strengthens me." Philippians 4:13&&aka w30wcf&&aka John Kort&&NRA Life Member&&.22 W.C.F. , .30 W.C.F., .44 W.C.F. cartridge historian
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