223 77 TMK Non crunchy temp stable powder?

[TimberHunter]

From what I’ve seen the rifle like 77TMKs. N150 is great but really crunchy at mag length to the point it’s pushing the bullet back out about .010”after seating and heavy seating stem ring/indent on the bullet. I’ve tried long drop tubes and electric tooth brush, helped but still heavy compression at 23/24 grains (book max is nearly 25)

TAC is not compressed with good groups and velocity but concerned about temp stability

Staball 6.5 is slow at almost compressed load and I don’t want to compress a ball powder load

If I want to stick to mag length, what powder so I go for?


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[flyfisher117]

8208 XBR has served me well. It’s a little crunchy but not as bad as my favorite, Varget. I stick to Varget in my bolt gun and 8208 xbr in my gas guns.

 

[JF_Idaho]

I agree on 8208. No crunch here but I only run 23.4 grains @2.260 and get around 2735 in Starline .223 brass @ 18"

 

[UnckleBob]

I haven't tried it yet, but Hodgdon's online reloading data suggests that we can get StaBall 6.5 velocity with a smaller charge of StaBall Match.

 

[Backofbeyond]

Benchmark has been my go to for 77 TMK.

 

[pbroski]

If available - H4895.

 

[Marbles]

N135. Not quite as good a velocity as N150, but not crunchy at max. For me I started seeing pressure signs at 23 gr. 22.5 gives me about 2,600 fps on a 16.5 inch barrel.

 

[KyleR1985]

Temperature Sensitivity of Powders for .223 High Power Service Rifle

 

[Truck24hr]

I think you could settle Varget and make it work with maybe up to 23.5gr.

I settle 25 grains, no crunch, but past AR mag length. Avg velocity 2875 w/20"

 

[Castle Rock]

In order of preference, H4895, 8208, Benchmark
Sounds like you could use a bit more neck tension too

 

[Juan_ID]

I do 23.5gr of xbr at 2.27” which just fits in a tikka mag. Slight crunch but nothing that affects seating depth. I’ve since switched to aics mags so may end up loading them out just a hair longer just cuz.

 

[vonb]

LeverEvolution

 

[wind gypsy]

In order of preference, H4895, 8208, Benchmark
Sounds like you could use a bit more neck tension too

This.

 

[FLS]

TAC. Ive shot thousands of rounds loaded with it it from the teens to the 90s and have never had an issue. Unless you are fire walling your loads you shouldn’t have an issue. I believe most claims of its temp sensitivity are parroted BS. That has not been my nor several other high volume 223 shooters I know experience.

 

[Schmo]

TAC. Ive shot thousands of rounds loaded with it it from the teens to the 90s and have never had an issue. Unless you are fire walling your loads you shouldn’t have an issue. I believe most claims of its temp sensitivity are parroted BS. That has not been my nor several other high volume 223 shooters I know experience.

If Tac is loaded to standard pressure, you shouldn’t have an issue. A friend of mine uses it in 7mm-08 hog hunting loads and shoots in the Texas heat

 

[FLS]

If Tac is loaded to standard pressure, you shouldn’t have an issue. A friend of mine uses it in 7mm-08 hog hunting loads and shoots in the Texas heat

Before Hodgdon bought them, Western powders published 5.56 (60000 psi load data. That’s what I’ve always used. I shoot 24-24.5 grains for 77 grain SMKs and TMKs.

 

[Schmo]

After I get my barrel back from Kampfeld, I’m going to do some tests with powders. I’ve got Tac, Benchmark, StaBall Match, StaBall 6.5, N150, Power Pro 2000-MR, and TS15.5. I’ve played with some of these before, but not in my current barrel. 2000-MR is supposed to give really good velocity

 

[bbrown]

StaBall Match

 

[mt terry d]

LeverEvolution

Correct me if I'm wrong but I was under the impression that this is not a temp stable powder.

 

[ResearchinStuff]

After I get my barrel back from Kampfeld, I’m going to do some tests with powders. I’ve got Tac, Benchmark, StaBall Match, StaBall 6.5, N150, Power Pro 2000-MR, and TS15.5. I’ve played with some of these before, but not in my current barrel. 2000-MR is supposed to give really good velocity

You've got all the reported good ones except 8208