Homeload fibre wad 7 1/2

[coneyhunter]

Hello all,

i have been using plastic wads but would like to use fibre instead in my homeloads, i have never reloaded using fibre wads so basically have very little idea of what im doing.

 

Im looking at loading a 28Gram cheddite 70mm case and primer.

Will they alter the pressures?

 

will i have to drop down a charge or increase the charge, i intend to use Alliant red dot

 

how many wads will i need to push the shot up for a uniform crimp?

 

apologies for such mundayne questions but i am really struggling to find any load data at all that is made for fibre wads.

[sitsinhedges]

Fibre wads generally produce lower pressures than plastic because they seal less well Though you could use a plastic obturator underneath the fibre wad which is supposed to give plastic wad performance 4mm nitro cards are normally used. IIRC a 21mm fibre and 4mm nitro card makes the correct stack height for a 28gram load in a 70mm case with a crimp finish. If your crimps are sunk you can fill out the case with thinner card wads under the shot to make up the volume but you shouldn't need to.

I would leave your recipe as is and see how you go.

[coneyhunter]

cheers mate

[Guest cookoff013]

coney,

 

fibre wad recipes, usually perform better with faster burning powders at higher pressures 9kpsi +.

if your usual recipe is less than this use another that has the pressure at 9kpsi.

red dot is fast enough to make a decent fibre load with 28grams. usually the american powders are slightly denser, so need larger fibre wads. you will be able to use 65mm hulls and fibre wads, its just finding the right stack height and crimp settings.

generally fibre wads do have lower pressures / speeds, but if you select a decent pressure / speed to start off with there will be no need to compensate. usually people add 10% powder, but with these ultra fast powders, it is ill advised.

one of my homeloads is 18 grains and maximum pressure, 10% more and it even exceeds cip 15000psi. so dont add more powder.

 

sits has it right, you may have to buy multiple wad heights to make the load fit..

ps, the pressure is the key.

[coneyhunter]

Thanks cookoff, much appreciated