25 prc? 25-7 prc? Experiences? Gotchas? Intangibles?

[schmidty3]

Well iv

See how it does with 57.5…but I’d load up 10-15 not a bunch. I would change powders if it’s not up to your standards before tweaking seating depth or anything. Then change bullets if it’s still not good after 2-3 different powders.

I've got 8 lbs of n565. 800 135s and 200 133s. I do have a lb of n570 and some old h4831 (long cut ).

Gonna try to get that n565 to work. I do think i need to jump them a bit more.

Been playing with my dad's seekins 6.5 prc. It really settled down around 60 rounds. I dont think it's unreasonable for a gun to take 50-100 rounds to break in, but im new to fancy barrels.

Im going to clean it back to bare metal and send a bunch more. Thatll probably do it.

 

[schmidty3]

A little update.

Realized that my seating depth was around .005" off. (My initial assessment was hasty).

Tried .30-.100 off in 4 steps with the 135s and 57.5 gr n565

Shots 3 -6 of the day out of a bare barrel are captured as number 1s at 30, 55, and 75 off. After those 3, the group seemed to drop ~1 inch lower. Either fouling or still breaking in i guess.

Omitting those, the groups were .6-.7" or so. Shot the ladder in a snake order. At the end I put the 3 remaining 133s I had in with the 2 others. That made a pretty decent 5 shot group.

So we are showing some promise.

My velocity ES's are still pretty inconsistent. Averaging them all, they probably would land around 2980ish. But my low was 2936, and my high was around 3020 I think. And the ES's within seating depths was at least 20-30 (or more).

We are still breaking in. And we have virgin brass.

Im going to try bumping up the powder charges and adding dry lube to the bullets until the brass is formed.

 

[Bluefish]

I too did some testing this week. 134 eldm, 22” 1:7 twist, h1000, 56g was 2910. Bumped up to 56.5 and it was running 2947. Es and sd are a little bigger than I would like. I assume that may get better if I bump up the charge a little more. Overall pretty happy with the speed. I can probably get more, but 2950 was my goal. I do think I will go shorter when this barrel is burned out. I have a 20” contender and that with a scythe on it is shorter than the 22” tikka, no can.