25-7prc load thread

[blacktailcentral]

Hey all starting load development on a 25-7prc. Was wondering what neck bushing everybody is using, wto has a few different numbers on their site. As well as powders/charge weight that yall have had luck with.

 

[Karl B]

WTO sells ready to rock ADG. That would be my go to if starting over. Wasn't an option at the time so I had to neck down 7prc.

I personally did 3 steps. I had the bushings and I hate ruining brass.

.298
.288
.281

bring it back up with a .2560 mandrel. Didnt lose a single piece.

n570 is gonna be your speed king. Start around 66.5gr and work up.

 

[blacktailcentral]

I bought one box of the already sized down and head stamped brass. Their site had some variance on the neck bushing size but called today and they confirmed .281. Going to start at 66gr then 67gr n570 with the 134gr eldm

 

[blacktailcentral]

Shot the first rounds out of the 22” pbb barrel today with the 134 eldm
66gr n570 average 2976fps
67gr n570 average 3020 fps

Hoping to get a bit more speed but the bearing surface of the eldm always makes them slow!

 

[surfr716]

Hey all starting load development on a 25-7prc. Was wondering what neck bushing everybody is using, wto has a few different numbers on their site. As well as powders/charge weight that yall have had luck with.

I just use 7 prc brass, run it through a 25 wssm neck sizing die (only for the first loading on virgin brass). second step: single pass through a hornady 7 prc bushing die with a .281 bushing. Trim to length as needed and use a 25 wssm seating die basically backed all the way out with a vld stem. The WSSM has the same shoulder angle and body diameter as the 25x7 prc so no issues there. Never had a single issue with crushing a case as long as i run it through the 25 wssm neck die first, skipped that step once and crushed a neck.

N570 will get you all the velocity, 133s at 3300 without pressure, even with hornady brass, but N560 gives outstanding accuracy, at least in my personal rig. you will lose about 100fps with it though. current loading is 62.5 gr n560 at 3175 with a 133 berger.

 

[blacktailcentral]

Did some more load development today got more speed but the bearing surface on the 134eldm just makes them not scorching fast.

25-7prc 22” barrel

68gr n570 3072fps
69gr n570 3110 fps this yielded a 5 shot group under .75”
69.3gr n570 3128fps

 

[SlimCreaper25]

Looking forward to this. Just shipped my barrel and action to my smith. 20” Carbon6 and Med AntiX. I’ll share my results when I get it back in 4-6 weeks.

 

[blacktailcentral]

Looking forward to this. Just shipped my barrel and action to my smith. 20” Carbon6 and Med AntiX. I’ll share my results when I get it back in 4-6 weeks.

Im looking forward to trying the 134 tmks im sure they will be rockets in the 25-7prc

 

[SlimCreaper25]

Im looking forward to trying the 134 tmks im sure they will be rockets in the 25-7prc

Ohhh I forgot about those! Those would be good too. I was hoping to get 134 ELDM going 3150


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[blacktailcentral]

Ohhh I forgot about those! Those would be good too. I was hoping to get 134 ELDM going 3150


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Definitely doable with the 134 i think 70+grs of n570 will get you there in the 20”

 

[SlimCreaper25]

Anybody seen an BC for the new 134 TMK?


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[blacktailcentral]

Anybody seen an BC for the new 134 TMK?


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Probably somewhere between the 128eldx and the 134eldm would be my guess

 

[Bluefish]

Probably somewhere between the 128eldx and the 134eldm would be my guess

Just looked at the sierra site and they are now listing a 131g tipped game king as coming in April. Maybe the tmk is going to be a tgk instead?

 

[blacktailcentral]

Just looked at the sierra site and they are now listing a 131g tipped game king as coming in April. Maybe the tmk is going to be a tgk instead?

I emailed them this week and they said the tmk is coming out by the end of the month. I just dont think they have updated their website yet.

 

[doc holiday13]

you could likely neck down in 1 shot. Use a 281 or 280 bushing. I used to do a wildcat 6 x 6.8 spc . Necked 270 down to 243. Did that in 1 shot. Even if the brass is new, I would suggest annealing after downsizing and then after annealing bring the size up with a mandrel die. The mandrel will get you exactly where you want to be with neck tension.

This kinda neck down would be like a modern 257 roberts but you're using 128-138g bullets goign 3k+. I bet if you used 6.5 prc brass you could use just about the same reload data

Slow powders will be your friend. Retumbo might be a good alternative to N570

 

[blacktailcentral]

you could likely neck down in 1 shot. Use a 281 or 280 bushing. I used to do a wildcat 6 x 6.8 spc . Necked 270 down to 243. Did that in 1 shot. Even if the brass is new, I would suggest annealing after downsizing and then after annealing bring the size up with a mandrel die. The mandrel will get you exactly where you want to be with neck tension.

This kinda neck down would be like a modern 257 roberts but you're using 128-138g bullets goign 3k+. I bet if you used 6.5 prc brass you could use just about the same reload data

Slow powders will be your friend. Retumbo might be a good alternative to N570

.284 to .257 will generally take two steps as to not abuse the brass. Generally you only want to neck down .010” per pass through the die