This thread is a little dated, but still appropriate...
I just purchased some Wolf large pistol primers from Powder Valley, and wanted to test them versus my normal CCI 300 primers.
I chose a .44 Special round that has been good for me, consisting of a 185gr LSWC bullet loaded over 6.9gr of Unique (.82cc Lee Pro Auto-Disk cavity) to a COL of 1.465" with a moderate crimp over the front driving band from a LFC die (this bullet doesn't have a crimping groove). The test gun was a S&W 624 with a 4" barrel. 25 rounds were loaded with each primer, alternating them though the Lee Classic Cast Turret to make things as even as possible.
The CCI 300 numbers for 25 rounds were:
Avg - 890 fps, ES - 98, SD - 21
The Wolf LP numbers for 25 rounds were:
Avg - 903 fps, ES - 67, SD - 19
Not eye-popping numbers, but normal for me when using Unique. Every round went bang, with no primer failures.
I'll probably try this test again with Titegroup and an Oregon Trail 200gr LRNFP bullet and see how they fare. So far, I'm impressed with the Wolf large pistol primers. They seat with just a touch more effort in my Winchester cases than the CCI 300 primers (using an RCBS hand priming tool), but it's barely noticeable.