Speer I think.. 6.5 140 gr Bonded factory seconds

[Hespco]

A faster powder perhaps for the CM ?

 

[the444shooter]

I've got H4350 that I'll try if this doesn't pan out; I'm trying to get to ~2900fps like many others are doing w/ RL26 and the CM.

 

[JMW67]

I've got H4350 that I'll try if this doesn't pan out; I'm trying to get to ~2900fps like many others are doing w/ RL26 and the CM.

I dont think you will get there with a 22 inch barrel

 

[the444shooter]

It might be an improbable pursuit, but after reading what everyone else is able to do w/ RL26 and the 6.5CM, I want to try. Even if it's 2850-2875, I'll be tickled.

 

[Stammster]

Yep, that velocity does seems slow, by almost 200 fps. I haven't shot these bullets yet, but get 2900 fps with Midway seconds 143 ELD-X at 2.800 COAL with highly compressed load of 49gr RL26 in Starline LRP brass - in my 22" Kimber Classic 84M 6.5 CM. Magnetospeed Sportster. That is right at max pressure per QL.

You are likely under pressure, but I'm not sure how much more RL26 you can get in a 6.5 CM case.

I've posted this target before at 49gr.

But here is also a 45.3 gr target as a comparison which is still faster than what you got with 3 gr more bullet weight.

Either these Midway bullets are slick, or your lot if RL26 is slow, or your case capacity is larger than mine, or some combination.

Also what temp are you shooting at? That may explain some of the velocity loss.

 

[the444shooter]

It was in the 30s here, today, but I don't think it would account for 200fps loss. The barrel is also new, with only about 20rds through it so far, so I'm sure that plays a factor in it. I also did a cursory wipe of the bullet, so maybe I need to clean them better, to build some pressure. I added .05 to the COAL, so I'm at 2.750, and I started back down at 46.5 and did .5gr increments up to 49.5gr. I don't think I can get more in the case unless I take it out to 2.800 or so, but I don't know if I'd be into the lands at that length. I put a bullet in a sized case and chambered it--it was LOOOOONG when it came out. ETA; I just did it again, and wound up with a 2.850 OAL, compared to a factory 140gr ELD-M at 2.800. So I think I might have a little bit more room to seat them out, but I don't have a way to compare the ogives to know how far off the lands a 140 ELD-M is, compared to these blunt spitzers.

 

[Stammster]

Some back of the napkin math. Your 48 grs at 2715 vs my 49 gr at 2900. Easily explained by:
1 gr more should get you 2765 fps ish.
50 deg more (your 30F vs my 80F) will be another 30-40 fps. That takes you to 2810 fps.
90 fps difference can be easily explained by powder lot and case capacity. Barrel break in also.
Plus 143's do shoot lighter than their weight would imply - so I'm not correcting there.

Your 45.5 vs my 45.3 gr is pretty close (100 fps) when correcting for temp and minor variance in case capacity. Hornady brass in my experience always has more case capacity than others...and the bullet length difference also eats some of that up.

 

[B-LOT Banga]

Factory browning x bolt with a 26" (1-7")
6.5 PRC ADG brass
140 grain speers "seconds"
68.4 gr of US869
COAL at 2.975"
FED 210 primers
1) 2998
2) 2997
3) 3003
4) 3000
5) 3001

outside to outside 5 shot 1.38" at 417 yds

prone, Spartan bipod w/ rear sand bag
55 degrees
Overcast and calm
8,700 ft above sea level

I tried to get another 5 shots but a massive downpour that lasted over an hour destroyed the paper target and any chances of another group as the winds also picked up 20-30 mph!

I'm happy I got a bunch of these bullets. They don't look spectacular but they shoot great and kill sheep instantly, passing through with 2"-3" exit holes. Hopefully my son can get more data on animals this weekend. I did NOT expect performance like this for "seconds"

 

[JMW67]

midway called them seconds they are most likely overruns or some boxes they found of the discontinued deep curls I found nothing wrong with them and alot of times when a bullet is called seconds its because of a slight discoloration and nothing to do with manufacturing flaws

 

[Stammster]

Factory browning x bolt with a 26" (1-7")
6.5 PRC ADG brass
140 grain speers "seconds"
68.4 gr of US869
COAL at 2.975"
FED 210 primers
1) 2998
2) 2997
3) 3003
4) 3000
5) 3001

outside to outside 5 shot 1.38" at 417 yds

prone, Spartan bipod w/ rear sand bag
55 degrees
Overcast and calm
8,700 ft above sea level

I tried to get another 5 shots but a massive downpour that lasted over an hour destroyed the paper target and any chances of another group as the winds also picked up 20-30 mph!

I'm happy I got a bunch of these bullets. They don't look spectacular but they shoot great and kill sheep instantly, passing through with 2"-3" exit holes. Hopefully my son can get more data on animals this weekend. I did NOT expect performance like this for "seconds

Impressive. 1/4 MOA at 6fps ES

 

[the444shooter]

Factory browning x bolt with a 26" (1-7")
6.5 PRC ADG brass
140 grain speers "seconds"
68.4 gr of US869
COAL at 2.975"
FED 210 primers
1) 2998
2) 2997
3) 3003
4) 3000
5) 3001

outside to outside 5 shot 1.38" at 417 yds

prone, Spartan bipod w/ rear sand bag
55 degrees
Overcast and calm
8,700 ft above sea level

I tried to get another 5 shots but a massive downpour that lasted over an hour destroyed the paper target and any chances of another group as the winds also picked up 20-30 mph!

I'm happy I got a bunch of these bullets. They don't look spectacular but they shoot great and kill sheep instantly, passing through with 2"-3" exit holes. Hopefully my son can get more data on animals this weekend. I did NOT expect performance like this for "seconds"

Amazing performance! Great shooting on your part!

 

[the444shooter]

Shot the following today, 1rd each, to test for pressure signs. 2.750 COAL, 6.5CM 22" PROOF, RL26, BR2 Primers, once-fired Hornady brass.
47.5gr 2738fps
48gr 2763fps
48.5 2795fps
49gr 2847fps
49.5gr 2843fps

No pressure signs, extraction/bolt ease of operation the same as factory 140gr ELD-M. Ran 3 rounds of factory 140gr ELD-M and got 2675-2702fps, so it's running decent numbers from a 22" barrel and 20*temps.

I think I'm going to bring them out to 2.790-2.800 to not be so compressed, and keep playing around.

 

[Stammster]

Looks like you are about 60 fps per grain. I'd shoot a few at 49.5 to see how they group and also to get an average on velocity. Based on the trend, I bet you are at +/- 2860 fps, which is dang good at that temp.

I'd also use a marks a lot on a bullet at 2.800" to make sure it doesn't hit the rifling.

 

[the444shooter]

Looks like you are about 60 fps per grain. I'd shoot a few at 49.5 to see how they group and also to get an average on velocity. Based on the trend, I bet you are at +/- 2860 fps, which is dang good at that temp.

I'd also use a marks a lot on a bullet at 2.800" to make sure it doesn't hit the rifling.

Thank you for the input. I believe 2.800 will have me .050 off the lands. I found the 2.790 from Nosler's 140gr Partition COAL as my guide, so I will likely start there and work up to 2.800. That should give me a little more room for powder so that I'm not too compressed.