Found a load that my 550 FS likes: 45.8 grains of H4350 and Remington 9 1/2 primers in Lapua cases, topped with a Hornady 129 gr. Spire Point.

This load yielded a 5 shot group 1 1/4" tall and 2 1/4" wide at 200 yards from a sling supported prone position (no bags).

Don't know velocity yet, but suspect it's moving at about 2800 fps.

HP...close to my own load

mine is 45.5 grn IMR 4350, rem brass, rem 9 1/2 primers, hornady 129 sp

i get about 2800 fps and an inch or less in my cz 550 american. kills deer real well too. good luck with this load...bud

HP,

How far off the lands are you?

Jaywalker

Jaywalker - I have the same rifle in the same caliber. I checked the OAL to the lands using a 140SptBt(SR) bullet in a "spent" case and touched at 3.07. Mine doesn't seem to like the slower powders, but is a "tackdriver" with Varget, IMR3031, and 4064 (either AA or IMR). Regards - Mags

quote:

Originally posted by Jaywalker:
HP,

How far off the lands are you?

Jaywalker

.020"