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Flat Bullet Base (Read 4041 times)

Flatlander Oldtimer Offline Posts: 705 Location: Warm Arizona Joined: Apr 24^th, 2004	Flat Bullet Base Mar 2^nd, 2019 at 1:48pm	Print Post
	Pope recommended only flat bases for accurate shooting and conventional wisdom has followed suit. i have been acquiring old Lyman bullet molds for awhile and have noticed several "target" cavities from days gone by have beveled bases. Now I am beginning to rethink the flat base. In breech seating is it really necessary? If so I may have to be modifying bases of some of my molds. Flatlander

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frnkeore Frequent Elocutionist Offline Posts: 7650 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Flat Bullet Base Reply #1 - Mar 2^nd, 2019 at 2:40pm	Print Post
	Ideal, Winchester and others, used that base, to help in loading a bullet into the mouth of the case, w/o shearing lead, for fixed ammo. What they did, was use the bevel, on the back side of a driving band, to produce, the beveled base. In many cases, the beveled base causes leading, by allowing gas cutting the start. Frank

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Flat Bullet Base Reply #2 - Mar 2^nd, 2019 at 3:17pm	Print Post
	Flatlander for what's it worth I slightly bevel my breech seating plainbase bullets and it's improved accuracy not diminished it as one might think. Leading has never been an issue by my doing so and I have done so for over seventeen years of competitive CBA and Schuetzen Shooting. It's a pain as I do each one by hand but its worked extremely well for me.

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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Flat Bullet Base Reply #3 - Mar 2^nd, 2019 at 3:24pm	Print Post
	What do you use to make your bevel, John?

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Flat Bullet Base Reply #4 - Mar 2^nd, 2019 at 6:25pm	Print Post
	I will have to try and take a picture when I have time BobZ.

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calledflyer Frequent Elocutionist Offline Posts: 3963 Joined: Mar 9^th, 2015	Re: Flat Bullet Base Reply #5 - Mar 2^nd, 2019 at 6:29pm	Print Post
	I have an old Herters set of cutters that, like the RCBS, etc. ones has inside and outside shapes. But, unlike the others, the Herter one has no post in the middle of the outside cutter. It works perfectly well. I gave up doing it for fixed because, like John said, it's a pain.


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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Flat Bullet Base Reply #6 - Mar 2^nd, 2019 at 7:48pm	Print Post
	Pretty much the same tool but an RCBS with the tit in the middle removed.

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beltfed Frequent Elocutionist Offline Posts: 1824 Location: Central Wi Joined: Dec 20^th, 2007	Re: Flat Bullet Base Reply #7 - Mar 2^nd, 2019 at 8:42pm	Print Post
	Just asking. How can you slightly bevel "by hand" every bullet with the Outside neck chamfering tool and get the bevel perfectly symmetrical on each bullet? beltfed/arnie


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Flatlander Oldtimer Offline Posts: 705 Location: Warm Arizona Joined: Apr 24^th, 2004	Re: Flat Bullet Base Reply #8 - Mar 2^nd, 2019 at 10:00pm	Print Post
	So it appears that it will be a try and see. Next warm day I will cast up some 1-16 alloy 32's with bevel and give it a go and see what happens. Thanks all. If winter would go away I won't have to think up these brain thoughts to keep busy😂 Flatlander

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Flat Bullet Base Reply #9 - Mar 3^rd, 2019 at 10:46am	Print Post
	Beltfed it's a slight bevel and it only takes a couple of turns. Try doing a search on the subject there has been a long conversation on the why's and how comes to beveling the base in the past.

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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 18036 Location: Oregon Joined: Feb 2^nd, 2009	Re: Flat Bullet Base Reply #10 - Mar 3^rd, 2019 at 11:11am	Print Post
	Flatlander wrote on Mar 2^nd, 2019 at 10:00pm: So it appears that it will be a try and see. Next warm day I will cast up some 1-16 alloy 32's with bevel and give it a go and see what happens. Thanks all. If winter would go away I won't have to think up these brain thoughts to keep busy😂 Flatlander I think that's the best course to take. I've on occasion used gas checked bullets without the gas checks and gotten very good accuracy. So I don't think it's as easy as simply stating one or the other works better. Try them, and see how they work in your guns and then you'll have a better answer.
	« Last Edit: Mar 3^rd, 2019 at 7:40pm by marlinguy »
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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: Flat Bullet Base Reply #11 - Mar 3^rd, 2019 at 11:27am	Print Post
	Flatlander if and when time allows and you have the chance please come back and let us know how they worked out for you.

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Dellet Frequent Elocutionist Offline Posts: 1301 Joined: May 19^th, 2017	Re: Flat Bullet Base Reply #12 - Mar 3^rd, 2019 at 12:04pm	Print Post
	I have seen this discussed many times over the years, about almost any bullet shape imaginable. My take away and what seems to be the consensus, is that since it seems to help across the board with any bullet shape, it has more to do with truing the steering end of the bullet. If the base has a clean, crisp corner, it will have better airflow.


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Flatlander Oldtimer Offline Posts: 705 Location: Warm Arizona Joined: Apr 24^th, 2004	Re: Flat Bullet Base Reply #13 - Mar 3^rd, 2019 at 6:39pm	Print Post
	JLouis: Will do. Flatlander

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