150gr Sierra MK BTHP 6.5 creedmoor

[Punxsy Guy]

Has anyone used the sierra 150gr mk bthp bullet in there 6.5 creedmoor with 1:8 twist? If you have tried or are trying it. Can you give some info on it on how good it works?

 

[FURMAN]

I found a great load with single digit ES with RL26 but if fell apart long range. The 147s are shooting tight so I gave up on the 150s for the time being.

 

[muleystalker]

I found a great load with single digit ES with RL26 but if fell apart long range. The 147s are shooting tight so I gave up on the 150s for the time being.

What twist barrel were you shooting them out of?

 

[FURMAN]

What twist barrel were you shooting them out of?

8

 

[muleystalker]

So looks like they need the 1;7 for sure.

 

[Texas10]

The 142 SMKs shoot very well out of my 8 twist. I also have, but not tried yet the Berger 140 grain VLD-Hunting with it's B.C. of .600

 

[FrankG]

The 142 SMKs shoot very well out of my 8 twist. I also have, but not tried yet the Berger 140 grain VLD-Hunting with it's B.C. of .600

You might get them to shoot out of a true 1-8 twist but you might not be getting the full advantage of the b.c. out of the bullet.

I say 1-7.5 twist at least according to my twist calc's to be on the safe side.

My 6.5 Creedmoor....(I just shot some of the 150's yesterday) out to 430 yards. The gun was a hammer. My barrel is a 1-6.75 twist. Also shot the Hornady's and they we're laser beams as well. The Hornady's (147's) will fly out of a 1-8 twist also but I'd run it a little faster.

I ran the 150's .010" off the lands. I tested loads with .005", .010" and .015" off the lands. The .005" was very good but the .010" and .015" we're excellent.

Shop just finished another barrel for me for my new F open rifle (will have .30cal and 6.5 barrels fitted up to it) and for the 6.5mm barrel I went 7.25 twist. Chamber will be 6.5PRC.

Later, Frank
Bartlein Barrels

 

[FURMAN]

You might get them to shoot out of a true 1-8 twist but you might not getting the full advantage of the b.c. out of the bullet.

I say 1-7.5 twist at least according to my twist calc's to be on the safe side.

My 6.5 Creedmoor....(I just shot some of the 150's yesterday) out to 430 yards. The gun was a hammer. My barrel is a 1-6.75 twist. Also shot the Hornady's and they we're laser beams as well. The Hornady's (147's) will fly out of a 1-8 twist also but I'd run it a little faster.

I ran the 150's .010" off the lands. I tested loads with .005", .010" and .015" off the lands. The .005" was very good but the .010" and .015" we're excellent.

Shop just finished another barrel for me for my new F open rifle (will have .30cal and 6.5 barrels fitted up to it) and for the 6.5mm barrel I went 7.25 twist. Chamber will be 6.5PRC.

Later, Frank
Bartlein Barrels

Watch out Frank. There are members on this forum that refuse to believe twist effects bc. I made that statement in another thread and it was like I was the first guy to suggest the earth was round! I am fairly confident my 8 twist is not enough for the 150s but like I said the 147s shoot great. They are short of the Hornady advertised bc most likely due to twist.

 

[FrankG]

Watch out Frank. There are members on this forum that refuse to believe twist effects bc. I made that statement in another thread and it was like I was the first guy to suggest the earth was round! I am fairly confident my 8 twist is not enough for the 150s but like I said the 147s shoot great. They are short of the Hornady advertised bc most likely due to twist.

LOL! I hear what your saying!

Depending on the velocity at times....that does have an effect on the twist rate needed. My closes twist calc's at 2800fps. you need a 1-7.92 min. and at 3000fps. you need 1-8.18. At 2600fps. you need 1-7.52.

Now throw in variables of altitude, weather etc....So I don't like running my stuff on the ragged edge of being stable. A little faster isn't going to hurt you on the twist rate and if it does help the b.c. of the bullet I'll take whatever I can get.

Now I'll throw another factor in the mix....some makes of barrels factory or custom don't come with the advertised twist rate. This is due to how some barrels are made. It might say a 1-8 twist but you could be getting a 1-8.6 or a 1-8.3 etc....

When you/I hear data and feedback from bullet makers and ammunition makers, and even seeing data from Gov't tests etc...I say yes the twist does effect the b.c. of the bullet.

I don't like leaving anything on the table.

Later, Frank

 

[Ringostar]

LOL! I hear what your saying!

Depending on the velocity at times....that does have an effect on the twist rate needed. My closes twist calc's at 2800fps. you need a 1-7.92 min. and at 3000fps. you need 1-8.18. At 2600fps. you need 1-7.52.

Now throw in variables of altitude, weather etc....So I don't like running my stuff on the ragged edge of being stable. A little faster isn't going to hurt you on the twist rate and if it does help the b.c. of the bullet I'll take whatever I can get.

Now I'll throw another factor in the mix....some makes of barrels factory or custom don't come with the advertised twist rate. This is due to how some barrels are made. It might say a 1-8 twist but you could be getting a 1-8.6 or a 1-8.3 etc....

When you/I hear data and feedback from bullet makers and ammunition makers, and even seeing data from Gov't tests etc...I say yes the twist does effect the b.c. of the bullet.

I don't like leaving anything on the table.

Later, Frank

Not many of us have the availability to barrels as Frank. I hope that Dave and Brady had a safe trip back from Phoenix. It was great to see them and they even came by company vehicle. What a great boss. Now make them work extra hard to make up for lost time.

 

[FrankG]

Ringostar, Dave and Brady made it back o.k.! Thanks! How does putting them on double time sound!?

 

[Erin McManus]

Ran a couple 150s through my Bergara 1:8 and got nice sideways looking holes at 100yds. First time loading a round that tumbled so it was a good to see something other than pretty holes. 10MOA at 100yds was interesting.

Erin

 

[284winner]

Ran a couple 150s through my Bergara 1:8 and got nice sideways looking holes at 100yds. First time loading a round that tumbled so it was a good to see something other than pretty holes. 10MOA at 100yds was interesting.

Erin

What speed ?

 

[Erin McManus]

284Winner!

IMR 4350 38gr 2451 f/s avg
IMR 4350 41gr 2722 f/s avg


Erin

 

[FrankG]

Ran a couple 150s through my Bergara 1:8 and got nice sideways looking holes at 100yds. First time loading a round that tumbled so it was a good to see something other than pretty holes. 10MOA at 100yds was interesting.

Erin

Bullets going thru the target sideways? Being a button rifled barrel it might not be a true 1-8 twist. If the button slips per say during the button rifling process you end up either with a non uniform twist and or a twist that goes negative. I've seen button barrels where the twist in your example was suppose to be a 1-8 but ended at 1-8.75 etc....

Later, Frank

 

[FrankG]

I chronographed my 6.5CM loads yesterday. Honest 2700fps. with the 150SMK. My barrel length is 23" finish. Nice tight and consistent groups.

Also clocked box Hornady 140 ELD-M ammo. Again and honest 2700fps. and groups where also excellent and again this was box ammo.

Also shot Warner Flat Line 121gr. bullets. No load developement with those. Picked a powder charge and seating depth etc....and those solids came in right about 1/2 moa and moved out at 3020fps. A full 1moa or a tad more flatter from 100 to 430 yards. I'll play with these some more.

Shot the gun out to my steel plate at 430 yards with the SMK and 1/4" for vertical and only 1.5" wide. Wind speed was about 5mph. I did this two weeks ago.