Alliant 2000MR Testing Complete - Pressure Signs?

[lte82]

I did a load work up with 175 smks, Alliant 2000mr, in lapua brass out of a 26" Remington SPS-V in an AICS chassis, and got some interesting results.

This powder seemed to shoot best for me with the upper end of the charge range, with a bughole 5 shot group at 200 yards being the best. It's literally one big hole torn out of the target. 47.5gr @ 2820 FPS average.

My question is, am I over pressure? I have a shiny ejector spot, but the primers don't seem too bad. Maybe I'm mistaken?

Starting from the right in the pic, the first row of three shells is 43gr IMR 4064 in LC brass as my baseline reference point (1 1/4" group at 300 today), the next row is 48gr 2000mr, then 47.5, 47, 46.5, etc.

What do you think? At what point am I getting over pressure?

 

[Jumper]

How hard did the bolt lift to extract? There is some cratering around the firing pin but the edges of the primers are still nice and round. Overall they dont look too bad to me.

 

[diego-ted]

I run 47.5 with 185 Juggers in Lapua brass at 2850. Little ejector marks but no heavy bolt lift.

Diego

 

[Xcount]

every combo is different and it appears your rifle shows pressure earlier than others, it will probably change characteristics in a thousand rounds anyway. I would pay attention to ejector swipes and drop a few tenths regardless of what the primers look like.

 

[lte82]

Very little bolt lift issue. I could still once finger the bolt open with ease with my cheek on the cheek rest.

 

[lte82]

Very little bolt lift issue. I could still once finger the bolt open with ease with my cheek on the cheek rest.