Hey now, BC plays a big part too because it counters the drag force, but my point is that mass is an equal partner to velocity in the momentum game. You can even think of it as a velocity coefficient. I think anyone who’s been shooting/reloading precision for a good amount of time knows that optimizing a cartridge’s performance is a delicate balance between mass/velocity/BC.
Yep, I was referring more to the idea that the impressive BCs are velocity dependent, and failing to get them moving to a certain velocity window causes the BC to be negatively impacted....or has that been dispelled and I missed the memo?
ETA: hadn't turned the page to see your other post @Dogtown That "delicate balance between mass/velocity/BC" is what I was referencing vis-a-vis the heavies in the (relatively) smaller x47L case.
Right at .050 jump on them.
On extended vacation...like forever
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Well, you won't be here long Sir if you don't read the rules about posting items for sale or trade.
Please delete the post, and maybe you can stay with us for a while.
Please delete the post, and maybe you can stay with us for a while.
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153.5s suck. Definitely should NOT buy any.
5-shot groups:
With a golf tee for reference:
These are the 2600fps node - extreme spread was 2598 to 2610 across all 3 charges.
Around .060” jump, didn’t even touch the tuner yet.
5-shot groups:
With a golf tee for reference:
These are the 2600fps node - extreme spread was 2598 to 2610 across all 3 charges.
Around .060” jump, didn’t even touch the tuner yet.
I built a 6.5x47 Lapua last Saturday and finally got it to the range today. About 40 rounds down the tube after this session. Tested 123 SMK’s, 140 Berger Elite hunters, 140 ELD-M and 135 Hornady A-tips. Testing was with H4350. This was the best group of the day. I’ll run this until I get 200 rounds on the barrel. No speeds yet. I’ll get that next week.
Very nice, which powder are those charge weights in reference to?
H4350. I think N150 or N540/50 would work equally as well. Wouldn’t go much faster than Varget with the heavies as your case fill would probably be pretty low.
Tried the 144’s with h4350 and it wasn’t great. Switched to varget and 36.8 grains shot a 15 shot group that was just over an inch because I’m an idiot and screwed up. Fps ranged from 2736-2745 through those 15 shots. This is one fun cartridge. Hopefully I will get to fumble my way through a match come the end of September.
Indeed it is. Definitely one of the easiest cartridges I’ve ever loaded - just isn’t picky the way some similar cartridges are.
I’m using N550 w/ 144 LRHT. A little slower than H4350 but good stable velocities out of a 26” barrel. Out of a 16.5” I’m using RL17 w/ 120 Scenar-L.
I’m using N550 w/ 144 LRHT. A little slower than H4350 but good stable velocities out of a 26” barrel. Out of a 16.5” I’m using RL17 w/ 120 Scenar-L.
I'm really curious what your 6.5x47 barrel length and velocity with the 135 atip was?
match targets from last Sunday, 2x10 shots. mild wind, but heavy mirage. 140 eldm, 39.5gr N550, cci 450, 2830 fps, 28" mmr Sabatti barrel. those 2 9s are my fault - impatient, not waiting for a clear view for a shot. second target (smaller group) is better.
Trued velocity at 603 yards today on the 123gr Scenar / 35.3gr Varget load. It's just chug, chugging along at 2,805 FPS, but the load works. See post #615 for short-range workup and specifics.
I had cleaned the barrel down to bare metal and put it up for the last ~5 months. I still had two leftover rounds from my previous reloading session, so I tried a CBS on the head. Much to my surprise I nailed it (will probably not have that happen again). Put the next five into ~ 4.25" with a slight touch of shifting wind, but I'm not good enough to wring much more out of it.
I had cleaned the barrel down to bare metal and put it up for the last ~5 months. I still had two leftover rounds from my previous reloading session, so I tried a CBS on the head. Much to my surprise I nailed it (will probably not have that happen again). Put the next five into ~ 4.25" with a slight touch of shifting wind, but I'm not good enough to wring much more out of it.
Approaching 3000 rounds on my x47, and it’s still shooting but I think the velocity has started to drop. Took it out past 500 yards for the first time in a few years, did ok at 1000 yards (first round impact on the 12” sight-in plate) but it fell apart at 1250. Switching headwind of 10-15 mph made it interesting. I think the bulets were going transonic at 1250.
140 ELD-M’s with 38.5 Reloder 17.
It was also cool to run into Greg with SPR, who is chambering a few more barrels for me. Nice guy who does exceptional work.
140 ELD-M’s with 38.5 Reloder 17.
It was also cool to run into Greg with SPR, who is chambering a few more barrels for me. Nice guy who does exceptional work.
Attachments
Man, 3K on a x47 barrel is pretty good. I've got enough supplies to go about 2,300 on each one of my barrels before switching them out. I know guys who have had them die at 1,500 trying to push x284 velocities and a lot of rapid strings, and guys who have had them make it about as long as yours running within SAAMI pressures and slower rates of fire.
Glad you had fun and thanks for sharing. I was starting to think that this cartridge had fallen off the face of the earth.
Glad you had fun and thanks for sharing. I was starting to think that this cartridge had fallen off the face of the earth.
I‘ve been shooting the factory Lapua 139gr scenars and they are performing very well. Does anyone have the formula for these?
Barrel specs and what velocity are you getting with that ammo?
Here my 139L Scenars handload workup. Stupid accurate and super low single digit SD's with Varget all shot 0.02" off the lands.... 36.8gr was my load
The 123L Scenars shoot one hole and are another favorite bullet of mine.
The 123L Scenars shoot one hole and are another favorite bullet of mine.
I’m using a DT 24” 1:7.5 and seeing 2845 @ muzzle. Well within .5 MOA @ 100yrds. Ringing the 2” plate @ 350yards constantly. That was with 1/4 wind at only 5-6 but was about 96` (Louisiana).
That's really fast for a 24" barrel
Not doubting you, but wow
Im running 2850 with a 136 scenar out of a 26" Hawkhill
That's insanely fast for a 139 out of a 24"
Yup what's the load? I'm getting 2800/2830 pushing varget with 130gr SMKs out of a 23" tube.
Factory 139 Lapua ammo
I get 2830-2850 out of a 27" Bartlein pushing 140 Hybrids
Guys,
My sincere apologies, I have the 26” barrel for this system. It was also the very first use I had with the LabRadar unit. These were factory Lapua 139gr OTM Scenar.
Attachments
123 scenar
35.3gr varget
Alpha brass
Cci 450
2690 in a fresh barrel (I'm expecting it to speed up to 2750)
2.6 sd
Loaded to shoulder junction
35.3gr varget
Alpha brass
Cci 450
2690 in a fresh barrel (I'm expecting it to speed up to 2750)
2.6 sd
Loaded to shoulder junction
Watching this. Seems like most data is from 10 years ago, when anything under 2950 was considered unacceptable. "But the speed wasn't there" is the most commonly seen phrase.
Damn...that is exactly my load (35.3 Varget under a 123gr Scenar). ES and SD are close too. I think I'm at 11 and 4 respectively.
I'm using Lapua brass and CCI BR-4s though.
Since I didn't get my bolt bushed (FN SPR) at the time of the rebarrel - which I will correct with the next barrel - I ran into pressure before I could get into crazy speeds for the x47. At 36gr I was starting to crater pretty bad, and accuracy had gone up close to MOA.
However, truing my velocity (chronograph put me at ~2,780) at 600 and 655, puts me closer to 2,805 FPS out of a 26" Krieger. Hopefully you get the speed you're looking for.
I ran some numbers in QL for that bullet and it looks like the optimized velocity range is 2550-2650 - not great, but not terrible. RL26, N550 fit those pretty well, but with RL17 you could push it into the 2700 zone.
Looking at 4Dof's doppler data, and comparing a 153 A Tip @2600 to a 140 Hybrid @2780, you might see a .1 difference in wind drift up to 12mph wind at 90° until you get to about 1000 yds, and which point it turns to .2
140 HYBRID @2780 FPS
153 A-TIP @2610 FPS
Not sure if the juice is worth the squeeze, unless you were considering running the 140s @2610 and seeing if the 153s would be a better option for slow stuff.
140 HYBRID @2780 FPS
153 A-TIP @2610 FPS
Not sure if the juice is worth the squeeze, unless you were considering running the 140s @2610 and seeing if the 153s would be a better option for slow stuff.
How fast would it have to go?
I run 153.5s right at 2600fps. OCD brass with 37.8gr of 4350. My chamber is .175fb and there’s definitely some room to go higher if you wanted to, I just never saw the need.
The current load matches 105s going around 2850fps in wind drift and recoil. Trace is very easy to watch with the larger bullet/slower velocity.
Downside I would say is that it can be a little harder to shoot. Definitely not as forgiving as a 6mm, especially positionally. The additional lock time is very real and will fuck with you if you don’t have solid fundamentals.
The current load matches 105s going around 2850fps in wind drift and recoil. Trace is very easy to watch with the larger bullet/slower velocity.
Downside I would say is that it can be a little harder to shoot. Definitely not as forgiving as a 6mm, especially positionally. The additional lock time is very real and will fuck with you if you don’t have solid fundamentals.
I'm getting close to finishing my 2nd barrel and definitely got another on the way. The 4 main bullets I've focused on have been the 156, 153.5 and 144 bergers, and the 153 A tip. I have a 27" 7.5 twist barrel also.
My 2 best results have come from the 156's in my first barrel and then the 144's in the 2nd barrel. I've tried hard to get the 153.5's and the 153 A tips to shoot great, but I just can't get them to do as well as the other 2 bullets. My velocity with both of them is great, 39.2 grains of H4350 gives me right at 2678 avg. 3 different lots of the 153.5 and I think I'm giving up on them until the next barrel.
The 39.2 H4350 is my load for the 156's and it was right at 2670. Lapua brass
For the 144 I landed on N555 and 41.6 grains and its right at 2770 and boy does it shoot well. I'm leaning towards shooting my next couple matches with this one.
My 2 best results have come from the 156's in my first barrel and then the 144's in the 2nd barrel. I've tried hard to get the 153.5's and the 153 A tips to shoot great, but I just can't get them to do as well as the other 2 bullets. My velocity with both of them is great, 39.2 grains of H4350 gives me right at 2678 avg. 3 different lots of the 153.5 and I think I'm giving up on them until the next barrel.
The 39.2 H4350 is my load for the 156's and it was right at 2670. Lapua brass
For the 144 I landed on N555 and 41.6 grains and its right at 2770 and boy does it shoot well. I'm leaning towards shooting my next couple matches with this one.
I was running 123 Scenars at 2910 with 40.6 grs of h4350. Those 139 should shoot well if you can’t get those to shoot you have a problem with the barrel
Just in case you want to see what QL predicts for that combo:
I’ve got an SRS Covert that I shoot 120s out of both 16” and 20” barrels. The 16” really needs the lighter bullets, but the 20” can shoot a wider range of bullets. I’ve used 123SMK and 123 A-Max in the past, but these days mostly shoot the 120 Scenar-L with both barrels using RL-17.
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