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Breech seating with a long freebore questions (Read 1672 times)

Dellet Frequent Elocutionist Online Posts: 1090 Joined: May 19^th, 2017	Breech seating with a long freebore questions Aug 24^th, 2020 at 11:08am	Print Post
	New to me rifle and having trouble coming up with a reasonable load combination. One thing that has been fairly consistent is some unstable bullets and flyers associated with what seems to be lead shavings on the cleaning patch vs just shiny specs. When there are just the specs, holes are round with reasonable accuracy. The distance from the end of the case, to the start of tapered lands is about .300”. To get a good engraving on the bullet base sets the bullet out around .350”+. The casting and a bullet when placed .080 ahead of the case which is about .020” ahead of where the neck ends on the casting. Seems like a long space ahead of the case. Does bullet deformation/miss alignment make sense for the leading and stability issues? Any potential problems seating that far ahead of the case? Using smokeless for now would like to also use Black.
	« Last Edit: Aug 24^th, 2020 at 11:14am by Dellet »

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calledflyer Frequent Elocutionist Offline Posts: 3561 Joined: Mar 9^th, 2015	Re: Breech seating with a long freebore questions Reply #1 - Aug 24^th, 2020 at 12:09pm	Print Post
	I never had that much jump in breech seat rif!e but I would keep moving the depth forward and try pinch more powder for the stability iaaue. Good shooting.


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bnice Frequent Elocutionist Offline Posts: 1851 Location: Iowa Joined: Nov 30^th, 2006	Re: Breech seating with a long freebore questions Reply #2 - Aug 24^th, 2020 at 1:37pm	Print Post
	Agree move your seater out to get the baseband to engrave. Once you get a good seal there it may quit tipping as well. Tipping and leading could be because your getting blow by on the unsealed bullet. If still tipping at that point up your charge, that long of free bore is like having a longer case.


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Dellet Frequent Elocutionist Online Posts: 1090 Joined: May 19^th, 2017	Re: Breech seating with a long freebore questions Reply #3 - Aug 24^th, 2020 at 2:07pm	Print Post
	The nice thing about smokeless is that I can up pressure without increasing velocity. That has seemed to help some. It just seems that the base is deforming before it is in the bore. I agree that seating the base deep enough for support should help and am working on a longer seating tool. Is there a "too far" from the case point? I am probably going to be close to 3/8" (sounds much more ominous than .370")


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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 11460 Location: Why, out West of course Joined: May 29^th, 2006	Re: Breech seating with a long freebore questions Reply #4 - Aug 24^th, 2020 at 5:33pm	Print Post
	I have three rifles that must be breech seated very deep. All three are very accurate. Like others have said, add a little powder to make up for the larger combustion capacity.

	A blind squirrel runs into a tree every once in a while.
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beltfed Frequent Elocutionist Offline Posts: 1752 Location: Central Wi Joined: Dec 20^th, 2007	Re: Breech seating with a long freebore questions Reply #5 - Aug 24^th, 2020 at 11:19pm	Print Post
	two suggestions: 1. try different hardness alloys 2. A bullet with a base band large enough to seal in the freebore section. beltfed/arnie


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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Breech seating with a long freebore questions Reply #6 - Aug 25^th, 2020 at 1:25pm	Print Post
	The base of the bullet could currently be being bumped up and then having to be swagged back down. My own personal experience with this in the past is it would pull a ring of lead back off of the base. My results appear to similar to what you are currently experiencing so seating it deeper would indeed be your best approach. It should also improve your group size substantially the closer it gets to engraving the bullet up to or even through the bullets base.

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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