6gt
- Thread starter Dthomas3523
- Start date
Case fill will be low, I'd try H4831sc, SW4350 or N555 at 2700-2750. But if that's where I wanted to run speed wise, I'd go straight 6br.
Anyone know the correct Dillon Precision powder funnel insert for the 6GT? I don’t see one listed in their chart and don’t know of any other common 6mm with a 35 degree shoulder (closest might be an ‘I’ insert for the 6mm Rem?).
I load on a 550 press and manually drop the charges from Autotrickler V3 into an Area419 funnel but this requires a proper insert to fit the case (or one very close) thanks for your help.
I load on a 550 press and manually drop the charges from Autotrickler V3 into an Area419 funnel but this requires a proper insert to fit the case (or one very close) thanks for your help.
The PPC funnel is what your looking for... https://www.dillonprecision.com/s000233 13085 is the number.
This is from a brand new 20" Carbon Six barrel. 7.5 twist.
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Nice. Just ordered a barrel and will be cutting to 20 probably. so looks like 2900 will possibly be doable.
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That is going about / almost as fast as Hornady Match in 6 GT was out of my 26 inch Bartlein barrel.
33.5 of H4350 in a 26” had me to 2750ish It was happier at 33.9 and basically 2800flat
I would like to run Berger 105 and ELDM 109 out of a suppressed 22in barrel slow at around 2750 with H4350. I’m thinking 34g of H4350 would be gtg but worry about not efficiently filling the gt case. Should I do a 6gt or step down to Dasher of BR?
The point of the GT is to shoot the heavies faster, if you're not doing that then a smaller capacity case makes sense.
Or shoot dasher or BR speeds in a standard AICS MAG without having to experiment with spacer kits and various mags.
You think so? My guess of 34g might be off then, I just want to run them nice and slow. Will get new MDT mags for either BR/Dasher or GT anyway. I had a 26in 6GT before and I didn't like the length with a suppressor or how the ARC and MDT AICS mags didn't run 100% for me.
I think I might be up to 35g of H4350 to get 2750fps out of the 22in barrel. I'm just worry about low case fill as @4O6shootist mentioned above.
Bergers lists a case fill of 104% of H4350 with 109g hybrids at 36.3g. Obviously there is variation in cases but I think you will be fine at anything between 34-35g. 35g would be 100.4% and 34g is 97.4% according to Berger. So even if you dip to 95% then you are still good to go.
I needed 35.5 gr H4350 in my last 26” GT barrel to get a 109 Hybrid to 2860. Subtract 100 fps for the 4” shorter barrel and you are where you want to be.
Your plan will work but I’d never choose a caliber around a powder. That way of thinking seems backwards to me.
FYI- Accurate AICS mags have been 100% reliable for me. MDT, not so much.
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Yes, it's backward
I found H4350 to be super temp-insensitive for me here in SoTex and I have a crap ton of it. Are you at 100% case fill at 35.5g?
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I’m in north tex and found the same. Over a 25 degree difference from 100 to 75 my speeds were only 13.4fps lower.Yes, it's backward
Insensitive?Yes, it's backward
No- I’ve ran 36gr in alpha brass jumping a 109 hybrid 0.080 and it wasn’t compressed.Yes, it's backward
N150 shot the best for me, single digit ES at 32 grains.
H4350 wasn't very consistent with any load I tried.
H4350 wasn't very consistent with any load I tried.
So mid 37gr in this case. Do you have your own rule for a good load density? Like Hairy was talking about 95% and up is gtg.
Sell all of them. Go Sierra 110. Those bullets just work! Just about to rebarrel my 6GT now and gonna burn the new barrel out with S110’s. It ain’t broke and I don’t intend to try and fix it.
Pretty much. I like a full case, to when I shake a loaded round, I can barely hear the chink of the powder. Switching to DTACS and 35.8gr H4350 still gives me that as the boat tail protrudes quite a bit lower than a 109 due to long bearing surface.
For those of you using H4350, any of you have velocity’s around 2840fps using 109 Bergers and 37.3 grains. I’ve looked and haven’t seen any as slow as mine. I’m using an A&D FX 120i and a Garmin xero C1. The powder and primers came from new stock. I’m 100 rounds in, it’s shooting tiny groups but am questioning the velocity according to Garmin. Wondering if my Garmin needs recalibrated. Thanks
H4350
Alpha OCD Brass
CCI 450’s
Bartlein 26” barrel
.0.120 Free Bore
H4350
Alpha OCD Brass
CCI 450’s
Bartlein 26” barrel
.0.120 Free Bore
I will on Thursday, just figured someone on here may have experienced the same problem, thanks for the input.
That is "slow" er than most here are getting, but sometimes a barrel won't truly speed up until 150 - 250 rounds.
I would 100% not worry about it if your rifle is shooting small. I know your question was whether your Garmin is off, but I would trust that as well. You can always shoot at 600 - 800 yards and see if your drop from your calculator matches what you are seeing if you really want to verify.
Taking it back out tomorrow, also loaded up 20 rounds w/ Vaget to cross reference velocities. Thanks
I mean if someone at the range has a garmin or labradar, shoot a few and compare to your unit. There are defective products made. Every one I've been around has shot very close to known labradar velocity, like within 10fps or less. 37.3gr H4350 is a heavy charge, and if it's making the pressure it should be, you should be seeing flattened primer. Normal charges in my experience to have a 109 at 2850 should be around 36.2-36.6 depending on barrel length. My 28" tubes is 36.2 t 36.6 at 2910-2920.
Any powders you like better for 6gt? Care to share some 6gt data? I assume it is pretty much the powder that they say its equivalent too?
I dont own a 6GT I was just replying to your question asking if anyone is using MW powders from American. I do use MP610 (N550) from American in my 22GT with excellent results..
Has that shown decent temp stability Dom?I dont own a 6GT I was just replying to your question asking if anyone is using MW powders from American. I do use MP610 (N550) from American in my 22GT with excellent results..
