V-V N340: position sensitive

nwgunman · August 10, 2002, 11:57 AM

I've been working up a 45acp load for 185gr jhp using V-V N340. Just out of curiousity I ran some across the chrono with the powder to the front of the cases, then some with the powder at the rear. Wow! Almost 90fps difference. With powder all the way to the rear (I pointed the muzzle up and tapped the gun slightly to settle the powder into position before each shot) I was getting about 980fps and with powder forward only 890. Odd thing is that when chronographing the loads as usual, my deviations weren't all that bad. I guess the powder settles between shots. I'm thinking that I won't have any problem making the "pf" at the IDPA match after all! Just FYI. Stay safe.

Andy Chadwick · August 12, 2002, 04:49 AM

Very common results. The biggest difference I've seen was about 175 fps in a revolver. The load was a RN lead over Unique.

Poodleshooter · August 12, 2002, 03:00 PM

The powder settles during recoil. I tried this test rather informally once, using Bullseye. All the same, try Titegroup, or a bulkier powder.

August 10, 2002, 11:57 AM	#1
nwgunman Senior Member Join Date: July 16, 1999 Location: Olympia, WA Posts: 312	V-V N340: position sensitive I've been working up a 45acp load for 185gr jhp using V-V N340. Just out of curiousity I ran some across the chrono with the powder to the front of the cases, then some with the powder at the rear. Wow! Almost 90fps difference. With powder all the way to the rear (I pointed the muzzle up and tapped the gun slightly to settle the powder into position before each shot) I was getting about 980fps and with powder forward only 890. Odd thing is that when chronographing the loads as usual, my deviations weren't all that bad. I guess the powder settles between shots. I'm thinking that I won't have any problem making the "pf" at the IDPA match after all! Just FYI. Stay safe.

August 12, 2002, 04:49 AM	#2
Andy Chadwick Member Join Date: March 2, 2002 Posts: 33	Very common results. The biggest difference I've seen was about 175 fps in a revolver. The load was a RN lead over Unique.

August 12, 2002, 03:00 PM	#3
Poodleshooter Senior Member Join Date: August 7, 2000 Location: Floating down the James River in VA Posts: 2,599	The powder settles during recoil. I tried this test rather informally once, using Bullseye. All the same, try Titegroup, or a bulkier powder.