28 ga hevi

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28 ga hevi

Postby NV Guide » Wed May 03, 2006 7:20 pm

First attempt loads came in too hot :thumbsdown: at about 15000 psi, and 1400 fps. Time to back off a couple of grain and add buffer (to help prevent bridging) and try again.
:thumbsup:
Dennis

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Postby pennsyltucky » Wed May 03, 2006 8:03 pm

are u still using longshot? and where are u getting ur loads pressure tested?
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Postby NV Guide » Wed May 03, 2006 8:12 pm

This time we are using Steel powder and are thinking about H-110. There was no way to get enough Longshot in the hull. A friend of mine knows a guy at one of the powder companies to get our pressure tests.

The tested load:
cheddite hull
ch209 primer
21.0 Steel powder :help: too hot
HV-28 wad
383 gr #7 hevi

We are hoping to back off far enough to get under 12500 psi and still maintain 1300fps :yes:
Dennis

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Postby pennsyltucky » Wed May 03, 2006 8:39 pm

i was just doin some figgerin for widgeon1 and i came up with 20g of steel using about the same components as u are. guess great minds think alike :smile: 20g with the 7/8oz and a cushion in the wad, should be at 1330 and under max press. were u fold or roll crimping? my book shows 12,500psi with these components with 19.5g steel and a full 1oz of lead. and thats supposed to fly 1300fps. are ur forcing cones too sharp? crimps too deep? how many loads were pres checked?

maybe 19g of steel would be better??? and what about 2400 powder? tried it? i like it in the 12 and 10. its a little softer yet than steel. its a 15%nitro powder that doesnt get the afterburner effect from chamber pressure like the single bases do.
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Postby pennsyltucky » Wed May 03, 2006 8:46 pm

H110 would be better yet. but i dont have any experience with it. and i guess ur forcing cones wouldnt effect the pressure in their test barrel. i was thinkin of my strain guage stuff. and be careful with the buffer, ive seen it add more than 2000psi to a good load. :salude:
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Postby NV Guide » Wed May 03, 2006 9:37 pm

I think that we are working out of the same base reference material. Either the quoted pressures are optimistic to start with or we a having a problem with the shot bridging, probably some of both. Next round we want to send both the reduced steel powder loads and some H-110 stuff and see what comes about.
Dennis

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Postby pennsyltucky » Thu May 04, 2006 6:53 am

yep, and most of these books just copy from other books. id like to know the results from the H110, just for reference.
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28 ga hevi

Postby widgeon1 » Thu May 04, 2006 6:59 am

NV/Pennsyltucky,
Thanks for the info update and I'd be real interested in the results of the H110 load as well.

Pennsyltucky...........thanks again for all the info you gave me in the PMs
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Postby pennsyltucky » Fri May 05, 2006 8:43 am

NV, how many are u able to get tested? enuf to try a few different primers?
the cci209 (not 209M) is usually the lowest pressure for me in the bigger gauges.
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Postby NV Guide » Sat May 06, 2006 2:56 pm

We limit the amount that we test so as not to wear out our welcome :thumbsdown: So we usually use ch209 or w209s.

I am excited about the H-110
Dennis

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28ga

Postby Sagebrush » Mon May 08, 2006 10:27 pm

Well I might as well put my 2 cents in, since I have talked to
all of you on the subject c/o pm's.

I think w209 will give the lower pressures..
Longshot might be too bulky to give the best loads.
H110 is a good powder for the 28 Ga.

Has anyone used 800-X yet ? ( 12ga 25.5 800x vs 35grs Steel )
It works great for the light loads !!

GM 2 3/4": 328gr steel 36gr800x 1850fps@11300psi load# 56

When I used Hevi, a Mod choke worked great for me to 65 yards.

Later guys Sage
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Postby Jim Broadbridge » Mon May 15, 2006 10:22 am

I found the Federal hull in 28 gauge to have the greatest capacity and yes buffering will increase the pressures, but it's worth it. :smile:
I'm not as good as I once was, but I'm as good once as I ever was.
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