No I wasn't picking on your or taken what you said wrong at all... just adding to the discussion. That's all. We're cool!
why my 1-10" Brux .308 won't shoot 195gr and up?
- Thread starter DukeDuke
- Start date
I'm not sure Walt but I could agree. We made 4R barrels for the Canadian FTR team to try out. They said they didn't shoot any better than the 5R so they stuck with the 5R's. That was back around 2016 or 2017. I think. Might have been before that. The Chow brothers did the test up there if I remember correctly.
Dimner
I do believe in Captain Crunch.
I don't have alot of experience with heavies, but isn't 2750 pretty fast for that heavy of a bullet in a 308 winchester? Maybe it's a pressure problem you are having that your old barrel did not exhibit.
Acyr
Gold $$ Contributor
I only shoot heavies and 6 grooves in 308 FTR. 200gr is a light bullet for me. 2750 is smoking fast for 190 and above.
I have a 6.5x47 Brux 4 groove with 120 shots on it and it is awesome!
Absolutely no pressure! I have 7 reloads on the Lapua brass, primers are not even flat. The 185 load is at 2860, no heavy bolt lift, no nothing. I could easily add a full grain to the charge.
memilanuk
Gold $$ Contributor
And... that data is for a min SAAMI spec chamber, min spec lands and grooves - because that's the way Hornady establishes their pressure data. It's not with a purpose-designed chamber with a long freebore specifically for seating the heavy bullets out of the case further.
I won't disagree that the load data the OP mentioned is bit too spicy by my standards, but bringing a factory load recipe into the discussion is just silly - it doesn't pertain to the actual situation at hand.
but you still don't know what the pressure is.
Just because you lengthen the throat and now you run a heavier bullet and your seating the bullet out further doesn't negate or necessarily say your lowering the pressure.
You also don't know the bore and groove size to the 4th decimal place for the dimensions of the barrel. Bore and groove sizes besides the chamber can have a big effect on your pressures.
Just because you don't see any signs of pressures again doesn't mean it's not there.
I had ammo tested in a pressure test barrel..... and 2gr up on my next powder charge the pressure went up 5k psi over the max rated for the cartridge. That put me at just over 70k psi but I had no heavy bolt lift, no flat primers, no ejector marks etc...and velocity wise it only gave me another +50fps.
My next load was another 2gr above that.... and I did shoot like 10 rounds thru my gun to see what it would do.... and again nothing seen. I sent that load down to be tested as well and they wouldn't run it thru the pressure test barrel. They knew from plenty of data they had that it would put the pressures knocking on 80k.
Not picking a fight with you guys at all but I'm just saying just because you don't see it or that you don't agree with the reloading books necessarily.... the pressure and safety issues could be there. So just be safe with what your doing.
Later, Frank
LVLAaron
Gold $$ Contributor
Anecdotal and just my 2 cents... I had a barrel once that would shoot amazing one day (best scores of my life in a full bore LR match) and the second day of the match (exact same conditions) it would be all over the place. I fought with it for too long. Changed powder and it completely settled down for the rest of it's useful life.
Dimner
I do believe in Captain Crunch.
That's just irresponsible to post.
Data researched by the company that makes the bullet is always relevant to the discussion. Regardless if the OP or anyone follows the advice and regardless if the data was researched with a SAAMI spec chamber. A well researched baseline is essential.
Correct... and once you start changing specs on things anything can be affected. That's why we need baseline information. You need a starting point.
This is the reason we made an ammunition pressure test barrel for 7/6.5PRC rounds and testing will be done. It's never been done before and we really don't know what some of these loads are running at in this caliber. At least we will have a baseline for this one coming up shortly.
LVLAaron
Gold $$ Contributor
Yes. 185's typically in the 2750 range. 200's in the 2650-2700 range... 2700 will get you clickers.
Dimner
I do believe in Captain Crunch.
With 3006 in the Michigan deer woods, anything over 2900fps is asking for trouble. Just as many sub 50 yard shots or even more than over 200. 300 yard shots are rare indeed unless you have manicured your property for hunting or are on farmland.
A decade+ ago when I first started hunting deer I would scout and put my self in a spot that would be outstanding for a hunter to shoot at a deer. Long draws or clear cuts on public land that were 400+ yards. Problem was, those great spots are great for the hunter, but the deer never used them. They don't expose themselves like that in northern lower peninsula. They go from small clearing to small clearing.
Took me a couple years to figure out that one. The funny part was, even in those big clear cuts they occasionally would walk 25yards in front of my blind. I was successful, but never on any deer that was special.
Anyway, back to fast bullets... Anything going much north of 2900 would not perform well at those short yardages. Unless you are paying for really expensive bullets.
I know this thread is about target shooting, but thought I would ramble a bit
A decade+ ago when I first started hunting deer I would scout and put my self in a spot that would be outstanding for a hunter to shoot at a deer. Long draws or clear cuts on public land that were 400+ yards. Problem was, those great spots are great for the hunter, but the deer never used them. They don't expose themselves like that in northern lower peninsula. They go from small clearing to small clearing.
Took me a couple years to figure out that one. The funny part was, even in those big clear cuts they occasionally would walk 25yards in front of my blind. I was successful, but never on any deer that was special.
Anyway, back to fast bullets... Anything going much north of 2900 would not perform well at those short yardages. Unless you are paying for really expensive bullets.
I know this thread is about target shooting, but thought I would ramble a bit
Maybe my labradar is not quite that accurate +-50
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D-4297
Gold $$ Contributor
2860 on a 185 ?...... Seriously ? Guess the next obvious question is ; How many reloads do you get before throwing that Brass away ? Ten , Twelve ? I run 185's at average 2660 - 2670 for F-TR and get decent results . High 190's and average 9 -12 X's a string . Brass has over thirty reloads on it , too .
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