n555 data needed

[hicap40]

scored 24 lbs would like some places to start with

300 wsm / 215 bergers

284 shehane / 180 bergers

FYI

Been using it with my 7/300 wsm and have been getting some of the best groups ever

John

 

[nakneker]

N555 was a bit slow in my 6.5 creed. I’ve been wanting to try it in my Saums, tagging in.

 

[hicap40]

in my 7/300 i started at 57 gr 2800 fps worked up to 59.5 2895 fps 180 hybrids

57.5 was winner with 1 small ragged hole at 300 yards
the rest of the groups were less than an inch at 300
I was thoroughly Impressed

 

[whatwind?]

7/300 wsm, .260 fb, ADG virgin, 307 bush , 310 ld neck, rem primer, 1:8.5, .277, 4 gr, 30" muller bbl, shots 61-77 on the barrel

N555, 190 LRHT @+20 ITL.................. at sea level, 65F, +20 DA, 75% hum

labradar data
never used this N555 before, would assume add 115 fps later in bbl life

for reference, 61.5 gr N165 gave me 2770 fps today same exact brass (v)........+/- 4 gr spread

Shot ID	grains	V0
1	53.0	2567​
2	53.5	2604​
3	54.0	2625​
4	54.4	2636​
5	54.8	2631​
6	55.2	2678​
7	55.6	2694​
8	56.0	2706​
9	56.4	2728​
10	56.8	2740​
11	57.2	2759​
12	57.6	2774​
13	58.0	2785​
14	58.4	2781​
15	58.8	2809​
16	59.2	2815​
17	59.6	2831​

 

[RegionRat]

A 284 Shehane is slightly more capacity than the 284 WIN parent, so any 208 WIN data using a 180 can be a good guide for starter loads.

For example these 555 loads using the 284WIN and a Lapua 180 give you a safe start but you can probably skip to the middle of this range for your Shehane because these are conservative.