Winchester large pistol primers- WLP

[paul105]

here are some interesting chrono results (same load, same gun, same day different primers):

305gr Saeco (Matts) SWCGC www.mattsbullets.com/index.php?main_page=product_info&cPath=71&products_id=264&zenid=rd6gls7eu8ejdgao8o4oa2sv66

Crimped in Crimp Grove
5 shots at 5 long paces and 65 deg F
Starline 1x 45 Colt cases
22.5 gr H110
4 1/4" bbl

Avg fps and ES

CCI 350 (Mag) 1,137 fps 31 ES
Fed 155 M Matc 1,107 fps 43 ES
WLP 1,099 fps 42 ES
Fed 150 Std 1,104 fps 34 ES

[matt56]

Did you notice if any primers were harder seating than others? I remember switching to CCI large rifle in 30-06 cases that were a little wore out and loose with Federal and Winchester.

[paul105]

There is a difference in seating pressure required depending upon primer make (maybe even indiv lot). I don't pay much attention unless "excessively hard" or "loose pockets". Offhand, can't remember specifics.

[Fowler]

Jun 23, 2022 5:03:22 GMT -5 handloadingnotes said:

I use WLP for all my 45 Colt loads, and am happy with that. I started using WLPs because it's what Hodgdon used for their H110 +P load data, and I felt safer about "hotrodding" when using their tested components with their data. I tried WLPs with standard pressure loads and was happy. It makes things simpler to always use the same primer in the same case. I have No complaints, no pierced primers, but no experience shooting it in the cold.

Since the WLP is brass-colored instead of silver-colored, I use it in my 500 Linebaugh loads to indicate a lower-velocity load with a faster powder. Full throttle loads get a silver-colored CCI350 primer in that cartridge, because that's what the load data indicated, and I've seen no reason to change it yet. But switching to a WLP for the milder stuff has been a nice way to prevent surprises.

I wouldn't put too much weight in trusting the primer cup color. I have had different colored cup in the same flat of 100 primers before, much less the same brick of 1K...