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Gregsheffield

20g load data

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Hi. Im looking for some help. I need some load data for 20g has to be a 70mm as using in a semi

20 gauge cheddite hull

70mm 

fibre wad 

vectan A1 powder 

2000 primer 

 

i need the powder weight and also over shot card and wad sizes.

 

thanks

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2 hours ago, Gregsheffield said:

Hi. Im looking for some help. I need some load data for 20g has to be a 70mm as using in a semi

20 gauge cheddite hull

70mm 

fibre wad 

vectan A1 powder 

2000 primer 

 

i need the powder weight and also over shot card and wad sizes.

 

thanks

on a1 try about  1.35 gram and 18mm wad        that shud leave u about 11mm for your crimp    overpowder     card 4mm   on loading 20 bore  now     cheers   george 07714 323 909

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I proofed a 20g load that was  70mm case, Fiocchi 615 primer, 18grains Vectan A1,  b&p z22 wad, 24grams lead shot, 6 petal crimp. 1280 fps and 712 bar average pressure. You really want a proper crimp on a 70mm case, not an overshot card and roll crimp purely for volume for the recipes to fit correctly.

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I use 18 grains 4 mm nitro card 16 mm fibre wad 28 shoot.

If using reload cases you will need to spin the crimp as 20 bore tend to spay out on crimp and want recycle properly in semi auto 

I use new cases to get over this problem .

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1 hour ago, propercartridges said:

on a1 try about  1.35 gram and 18mm wad        that shud leave u about 11mm for your crimp    overpowder     card 4mm   on loading 20 bore  now     cheers   george 07714 323 909

or try ao powder

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4 hours ago, Gregsheffield said:

Hi. Im looking for some help. I need some load data for 20g has to be a 70mm as using in a semi

20 gauge cheddite hull

70mm 

fibre wad 

vectan A1 powder 

2000 primer 

 

i need the powder weight and also over shot card and wad sizes.

 

thanks

if 24 gram try the a1 load if 28 grams try the ao powder please put shot wieght in future   bit confusing not knowing the  charge load   cheers   g

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A1 is built for 24-25 grams, A1 sp or A0 are better for 28g, although new A0 Is not as slow burning as it once was. I proof load 1,35g X 27g lead and was in the almost got to 1000 bar, 28 g even with a roll crimp will be close to that.

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Found the certificate for the A1 load: 

1,25. X 27 gualandi wad star crimp at 60 mm 

AVG: 923 bar, 393 m/s one test went to 1004 bar

Definitely not a powder for 28g in 20 bore.

I think you can try 1,20-1,25 X 24-25 g with star crimp or 26 for RTO in a 70mm hull

Edited by Continental Shooter

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