10 Gauge 2 5/8" Load Results
 

I sent in a couple of loads I worked up for a 2 5/8" 10 gauge Parker lifter and here are the results from Precision Reloading:

Bismuth Load:
10 Gauge Cheddite 2 5/8" Hull
Win 209 Primer
SP 10 Wad
16 Ga 1/8" card wad filler
1 1/4oz Bismuth #2
26 grains of WSF Powder
Overshot card and roll crimp

Avg Velocity: 1164
Avg Pressure: 8342

I worked this one up for a potential goose hunting load.

My second load was a lead load:

10 Gauge Cheddite 2 5/8" Hull
Win 209 Primer
Sp 10 Wad
4- 16 ga 1/8" cards
1 1/8oz #8 lead shot
22 grains of WSH Powder
Overshot card and roll crimp

Avg Velocity: 1166
Avg Pressure: 8807

The pressure is higher on this load than I would like.

Matt:

I tested a 1.25 oz bismuth load using 26 grains of WSF and had lower pressure, but a bit more velocity. (http://parkerguns.org/forums/showthr...er+super+field). Not much difference in recipe, but you are about 1000 psi higher than me. My hull was 2 7/8 inches, fiber wad under the shot, and a fold crimp.

Did you individually weight each sample? Or did you meter load the samples? Can you post the result form?

I am particularly interested, as my 26 grain WSF load is one of my go-to duck loads. I’ve been very pleased with it this season.

-Victor

The difference in pressure is because of the hull length and the use of soft filler wad.

Here is the information sheets from these two loads. I did individually weight out the powder and shot for these loads.

I've never understood why a shorter shell produces more pressure. If it does simply because it's shorter and that's the only difference, please explain why.

I have duplicated this Bismuth load in a Remington hull with a cork filler under the shot and I'm going to send it in for testing. I would think with a roll crimp that this should have lower pressure like Victors 2 7/8" load. I will post the results when I get them. I'm looking for a goose hunting load for my lifter, that is why I'm going with #2 Bismuth.

Not likely. The tested loads are not identical, the 2 5/8" load used a Cheddite hull, the 2 7/8" load used a Remington hull. I will wager use of the same hull will show closer results in pressure.

Matt:

I look forward to seeing the results. The roll crimp is now the only significant difference from my load. Pressure should drop. Perhaps even below the pressures I produced.

-Victor

I would say very likely , yes the change in hull will change pressures also . The testing I've done shorter hulls always produced more pressure . Tom Arburst told me less space for gas to expand = more pressure .

Also with the testing I had done using TSS , which always required the use of fillers , the more soft fillers ( felt , cushion wads ) = lower pressures and less consistency . As opposed to harder filler ( Nitro cards and cork ) = more pressure .

But don't take my word for it you can always call Tom Arburst , he can explain it better than me.

Well, I'll have to call Tom. I don't see where there is less space for gas to expand. Yes the shell is shorter but that's because less space was used in the wad section not the powder section. I could see what type of wad or how deep the crimp was would effect pressure. After the holiday I'm gonna have to call him.