Hello Joe! I am running 65.7grs of H4831sc to get to the 2910 node, with the 215s. My guess would be somewhere between 63.8 and 64.7 of the RL-23. Am I in the correct vicinity?
I never shoot coated bullets of any kind. However, 2 things to keep in mind: 1.) H4831sc is NOTORIOUS for huge swings in lot-to-lot consistency. I have personally seen as much as 1.0 grain to obtain the same velocity. I have heard of people going to almost 2 grains! So just because mine is 65.7 does NOT mean yours will be. and 2.) my freebore is .240>>which is quite a bit. I am seated 22 thousandths OFF the lands and the bearing surface is about 1/3 of the way up the neck. That is a sizable increase in case capacity..As I am going to start working loads up in mine shortly could you confirm that you H4831SC load is with bare bullets not moly??
Was going to start at 62gr
Hello Larry! Yep! I love the Hodgdon powders>>>but they have that awful trait! I think that Varget and H4831sc are the worst of 'em.. I have had 2 / 8 pound jugs of both RL-16 and RL-23>>>very different lots>>>>same load! The "new" Alliant powders, at least RL-16 / 23 are really good with lot-to-lot consistency and they really are temp INsensitive!Ben, I just ran into the SC rate change you wrote about....0.8 grain to reach the same vel with same bullet lot, etc. in my 7/270 WSM.
I never shoot coated bullets of any kind. However, 2 things to keep in mind: 1.) H4831sc is NOTORIOUS for huge swings in lot-to-lot consistency. I have personally seen as much as 1.0 grain to obtain the same velocity. I have heard of people going to almost 2 grains! So just because mine is 65.7 does NOT mean yours will be. and 2.) my freebore is .240>>which is quite a bit. I am seated 22 thousandths OFF the lands and the bearing surface is about 1/3 of the way up the neck. That is a sizable increase in case capacity..
@ShootDots I know you had your trials and tribulations with the 150gr SMK,but what velocity could you reliably push them and still keep your node? That bullet sure looks good on paper!
I run them in a 6.5x47 at 2,770fps in an 8 twist, which puts me around 59” in a 10mph wind. I’ve had great results with it, just curious where that bullet in a 6.5x284 stacks up to the 215.
(That’s a fantastic bullet, I run it in my win mag for Hunting, even shot that rifle at the last 600 yard BR match last month, those suckers shoot!)
@bbarber25 The best load was running them at 2930 if memory serves me correctly. The "problem" was the fast twist, coupled with the 4 groove conventional rifling. That caused blow-ups and very near blow-ups..
Copy, I’ve witnessed the issue you were having first hand with a buddy running 150’s at 2950ish, didn’t have issues till 13-15 shots into a string and then blow ups 100-300 yards down range. At 2930 Mr. Litz says about 53” of drift at a grand, so in the ball park of a WSM with 215’s with a lot less recoil. But, that only is an advantage if all your Bullets make it to the target.
Thanks for the info!
@ben_g,I was seriously considering getting a special barrel for the 150SMK
7.75 twist with 5R rifling.
I found your going to do it shooters far more knowledgeable than me have suggested canted lands rifling and minimum twist to keep it stable at your intended temp/altitude.
I think the issue with this bullet is when you spin it in a faster cartridge like a 6.5x284 you risk jacket failures particularly in a long shot string
Underspin it and you do not achieve its BC potential.
The tight twist barrels in Creedmoor or a x47 do not seem to have the HP to cause this issue. But in a x284 it appears it is.
Lack of availability in Australia ultimately steered me away from doing the 150gr experiment.
Going the tried and tested SAUM and 300WSM instead.
I also run them with 8tw...2830. Only 5 shot strings. I've shot 1500-1600 of them. No problem. Do not over spin them or shoot long strings in the heat!Do you fire an fclass course of fire??
I may be wrong, but I believe 1shot is using coated bullets. This could make a big difference and if i'm right it looks like it does. On another thread and looking at above comment, looks like he has a good handle on this bullet!I also run them with 8tw...2830. Only 5 shot strings. I've shot 1500-1600 of them. No problem. Do not over spin them or shoot long strings in the heat!
Yes, I shoot moly coated bullets. At the SWN, I shot this cartridge in the Palma match. Clean at 800, down 1 at 900, dropped 6 at 1K. No blowup or issues of any kind.I may be wrong, but I believe 1shot is using coated bullets. This could make a big difference and if i'm right it looks like it does. On another thread and looking at above comment, looks like he has a good handle on this bullet!
Allegedly Re23 (alongside AR-Comp and Re16 the new-generation Bofors manufactured Alliant powders) is temperature insensitive thanks to 'TX Technology'.
We're only just starting to get these grades into the UK, no chance to look at them yet. I wonder too how much nitroglycerin is in the new grades as it varies considerably between the older members of the Bofors manufactured Norma / Alliant families. Some have less than 5% by weight, but Norma 203-B / Re15 is listed as 7.5% and MRP (very close to Re22 if not the same thing) at 11.5%.