Puzzling extraction with 44 mag

[roval]

I've consistently noted that I've had stickier extraction shooting 44 mag 240 gr lswc with a mod load of 10.5g unique vs 240 gr jacketed xtp with 23.3 gr 296 or 19 gr 2400. There are otherwise no pressure signs for any of them.

My SRH even with factory ammo, the one box i ran throught it, has to have the rod tapped sometimes with the base of a magazine to push out the brass.

The 296 and 2400 are much hotter loads but seems to extract more easily. Why would this be? I didn't chrono the 296 and 2400 loads as I mainly measured the shock wave when I tried it in the past. The 10.5 unique is 1235 fps.

No problems with these loads otherwise.

 

[ewlyon]

Unique is a faster burning powder than the others so my guess would be that the unique generates higher chamber pressures that are enough to cause sticky extraction. By the time the other loads really start to rise in pressure the bullet is further down the barrel. But since you are getting stuck cases on factory ammo you should figure out what is causing that, could be a rough chamber or maybe elevated pressures from a tight bore or something

 

[Wreck-n-Crew]

1235 fps is fast for 10.5gr Unique ..what barrel length?





Sent from my LGLS991 using Tapatalk

 

[roval]

7.5 inch srh

 

[roval]

Forgot to mention throat is slightly oversized at .431 measured with a pin gauge.

 

[TimSr]

While 296 way be a "hotter load" if "hotter" is based on felt recoil or velocity, the actual chamber pressure will spike higher with that load of Unique. I'd reduce it until its not sticky any more if you're going to use Unique, or load your same 23.5 gr of 296 under it.

 

[Salmoneye]

Alliant has listed 10.3gr Unique as max under a 240gr jacketed bullet since at least the 1992 paper manual (Hercules then)...

It is still 10.3 max today on the Alliant website...

 

[roval]

The unique load for a lead swc 240 gr hardcast is 10 to 11.7 and 10.8. To 12 for 240 jacketed hpp in Lyman 49th.

The unique was in the lead swc.