Got it. I thought you guys were seeing the old school nodes where there is a dip etc. yeah. I see some that yield good es/sd. Thanks
Agreed. I started doing 10 shot zeros after that podcast. Luckily my match rifles are all still 0.3Xmoa guns with 10 shot groups at 100y from a modified prone bag/bipod combo. But it gives you a really good idea of the true center of your cone of fire.That goes back to the Hornady podcast about sample sizes
Small cases, absolutely. 6br, bra, gt, dasher 100% spot on. Magnums require testing. I could take a 300 norma and drop exact same charge of H1000 in perfectly prepped brass and seat a 215hyb at exactly 50k off lands, and it might shoot over an inch at 100y, seating depth in or out 25k, could shrink it dramatically, may need another 1.5 grain or 2 of powder to get it up another 60-70fps to get bug holes.The only thing that appears to be certain is: if you can make the same round over and over again, like a clone of the last one, and just like the next... your ES and SD numbers will look good.
If you can do that, then chances are your shit will shoot lol.
Small cases, absolutely. 6br, bra, gt, dasher 100% spot on. Magnums require testing. I could take a 300 norma and drop exact same charge of H1000 in perfectly prepped brass and seat a 215hyb at exactly 50k off lands, and it might shoot over an inch at 100y, seating depth in or out 25k, could shrink it dramatically, may need another 1.5 grain or 2 of powder to get it up another 60-70fps to get bug holes.
Varget, N150, TS15.5, H4350, RL16, it don't matter, the gt shoots as long your reloading practices are sound. 4166 works too but only if you're content with speeds mid 2800s and lower, but in that case you should be shooting a br based case.This 6GT is my first go around using "Varget" (Varget-clone Shooter's World Precision Rifle anyways) and it's magic sauce for sure. Stupid consistent. I don't have to break out the chronograph to know I'm in single digits with my SDs and my ES is good, just by looking at targets.
After ~2 years of using Sta-Ball 6.5 in 6CM, which can be hard and does one no favors... the magic sauce is stupid easy.
Varget, N150, TS15.5, H4350, RL16, it don't matter, the gt shoots as long your reloading practices are sound. 4166 works too but only if you're content with speeds mid 2800s and lower, but in that case you should be shooting a br based case.
Agreed. My 2920fps load in a 28" barrel is likely similar chamber pressure to a 26" with varget at lower 2800s. The GT will shoot very well 2820-2840, 2880-2920 and then again up near 3000 in experience with 5 barrels. Burn rate determines it a bit. I love the accuracy and repeatability so much I'm building a hunting rifle in 6gt for deer/antelope. Bat bumblebee action and a 22" 3B hawkhill 7tw to run supressed. Gonna be a fun lil toy.I'm not really concerned with speed. IMHO once above ~2800fps, more speed doesn't really matter much as long as the accuracy looks good. A 6mm is never going to be a great "heavy wind gun" choice and that's the only reason I might even want to flirt with pushing one for speed...
I mean, it's not like any of us are going to run out of elevation in our scopes lol, 1000 yards was only 8mils today at only 2820fps.
SD 3.0?Today’s results
Alpha brass, cci450s, 109eldm, 35.9g h4350. Base to ogive using SAC tool-1.851”SD 3.0?
What brass, bullet, powder, primer . . . ?
Can you tell us a little about how you reload, dies, neck tension, etc? I promise I will take the time to read carefully whatever you decide to share.
Nice conditions on the range yesterday morning 19.7 degrees, barely discernable wind around a mph made for a good day on the range verifying 4DOF data. Load is Alpha brass 5th firing, FGMM primers, 32.5gr of RL-15.5 and 109 Hybrid's jumping .065" Barrel is a PROOF cut to 26" and chambered with a .170 Alpha reamer by Straight Jacket Armory, velocity 2857fps SD 7.
How’s the temp stability on the 15.5 compare to RL-16?
Mine average about 0.269" on the second loading.Curious what you guys are seeing for loaded neck diameter with Hornady brass? Barrel is on the big brown truck and trying to get everything needed.
Thank you Mike!Mine average about 0.269" on the second loading.
I'm using 267 redding, gives me 266-2665 after sizing and loaded is 269. I do not mandrel or expand, just seat a bullet. Gives me half moa groups at 700y, and 10 shot groups in the 3s at 100y. Es is mid to high teens generally.Sorry if I missed this but what size bushing is everyone using for alpha brass?
Sorry if I missed this but what size bushing is everyone using for alpha brass?
I'm not disagreeing with this post just curious about your thoughts on barrel life. I had a previous 6gt barrel which I loaded with 4166 32.4gr 105's, consistent ES of around 10 (ten shot string) and SD of 3. Yes you are correct speed was only around 2800 but I also got 3200 rounds on that barrel. It was a hammer until then.Varget, N150, TS15.5, H4350, RL16, it don't matter, the gt shoots as long your reloading practices are sound. 4166 works too but only if you're content with speeds mid 2800s and lower, but in that case you should be shooting a br based case.
I don't fault anyone running mid or low nodes. I run 28" barrels generally and run the 2900-2930 node with 109s using H4350. My last two barrels have been pulled at 2500 and still shot well. The extra 2" has been worth 40-60fps from what I've observed depending on burn rate, it takes me a slight increase in pressure to get to the next node VS a guy with a 26" barrel. When I ran 4166 to break in with 109s 32.4gr was right around 2840fps prior to speed up.I'm not disagreeing with this post just curious about your thoughts on barrel life. I had a previous 6gt barrel which I loaded with 4166 32.4gr 105's, consistent ES of around 10 (ten shot string) and SD of 3. Yes you are correct speed was only around 2800 but I also got 3200 rounds on that barrel. It was a hammer until then.
I think there is something to say for running a little slower to save barrel life, especially when you find a barrel that shoots and you want it to last.
my 2cents
I'm trying the heavy and slow approach this year. I went from 105's at 3010 (33.66g Varget) to 115 DTACs at 2725 (31.0g Varget) in 8X fired Hornady brass. JBM shows the DTACs at 2725 with the same wind drift as the 105's at 3010. Just a fun experiment.
I've done some testing with H4831SC. 39.5 did well with 115 RDFs in a 7.5 twist 26" Bartlein. 2875-ish, slightly crunchy, but no pressure signs.2850-2900fps seems to be the right zone for barrel life and also for what hammers from what I’ve seen.
I’ve got a bunch of SW Precision Rifle to use up, but I’m probably going to try 4831SC in the GT at some point…
I figure hitting full case fill it’d be right around ~2850fps or so…
Anyone suggestions for the Berger 115 VLDs? Varget, new Alpha OCD, 450s.
I see very conflicting reports of jump (60-100) vs little jump. Any concensus on what this bullet likes?
Keeping velocity/psi down is more beneficial to barrel life than longer jumps. You're already jumping 60k, that's plenty of jump.Should I be concerned with shortened barrel life if I find a load at jam - 20 vs something in the 50 - 100 range. OR are the hotter loads going to affect the barrel life much more than the short jumps? Or both? I'm guessing the hotter loads.
I've loaded a few 108 ELDs at 33.4gr of Varget, Alpha OCD, 450s with 60 jump that gave respectable groups, but my MPA barrel is still new, less than 50 rds and I'm getting used to the MPA BA Comp chassis when my Vudoo sits in an ACC. I like the ACC better.
Should I be concerned with shortened barrel life if I find a load at jam - 20 vs something in the 50 - 100 range. OR are the hotter loads going to affect the barrel life much more than the short jumps? Or both? I'm guessing the hotter loads.
I've loaded a few 108 ELDs at 33.4gr of Varget, Alpha OCD, 450s with 60 jump that gave respectable groups, but my MPA barrel is still new, less than 50 rds and I'm getting used to the MPA BA Comp chassis when my Vudoo sits in an ACC. I like the ACC better.
Using CCI 450s. The same lot of primers had more resistance seating in multiple firings of FGMM 6.5CM brass.@AirgunnerPCP what primers are you using? I notice in my Alpha brass that GMM primers don't have the same seating resistance as CCI primers. I haven't loaded any of the Hornady brass yet. I have 400 new pieces of Hornady GAP 6GT brass. Hopefully I don't have any issues.
I’ve been cycling through 400 pieces of Hornady that was originally loaded by Prime with 115RDF’s. 3rd firing & haven’t had to send any to the scrap bin.@AirgunnerPCP what primers are you using? I notice in my Alpha brass that GMM primers don't have the same seating resistance as CCI primers. I haven't loaded any of the Hornady brass yet. I have 400 new pieces of Hornady GAP 6GT brass. Hopefully I don't have any issues.
I just got my 400 pieces of gap in the last couple weeks. I wonder if it's the same lot as yours?Using CCI 450s. The same lot of primers had more resistance seating in multiple firings of FGMM 6.5CM brass.