Can anyone tell me the expected throat errorison on a 6.5x47 running them at max? Looking to determine how much chasing lands guys are doing as their barrels reach high round counts.
Thanks
Thanks
6.5x47 Lapua throat erosion
- Thread starter PAshooter20BR
- Start date
If you are going to run them at "max", then there are a few other variables that can enhance or retard barrel wear. 1.) Will it be used in a competition where long shot strings are the norm?; 2.) Will you be using a double based powder like the N500 series of Viht powders? and finally, 3.) Will it be shot in a very hot climate like I have out here in the desert in Arizona? If the answer is yes to all of them, then significantly MORE wear will be thrust upon the throat than using it for plinking and fun shooting with a single based powder up in a cooler climate. If it's the latter, well in excess of 2000 accurate rounds can be expected>>>it you are where I am and using VV N540 or N550, in F-Class competition, you will be doing good to get 1800 really accurate rounds..
Thanks a lot. H4350, no more than 5 at a time.
ShootDots absolutely correct! I currently have one with well over 1,000 rds, 130 vld's 2920...same amount of erosion you are seeing, but shoots great. the other rifle has same amount of rounds 140 hyb and 147 eldm with H4350 at 2750, still going strong! Seen many go in excess of 2,000 rds.
Not especially true with 130 vld....I've shot thousands! Berger recommended .015 jam a number of years ago. I played with .005, .010, and .020 off. Never saw the groups you can get at .010 jam. Berger knew what they were talking about. 1/4...1/3 moa all day long every day!
mikecr, I know what you mean, I shoot a number of the heavier bullets off the lands!
Well, if you didn't try out to .120 off or more, then you didn't even do full seating testing.
If/when Berger ever recommended 15thou ITL, they didn't know what the hell they were recommending.
It pains folks to hear it, and I know this because I've been trying to convince people that VLDs did not have to be jammed for over 30yrs now, but it's just a simple truth. All you need to do is test it.
All anybody ever needed to do was actually test it for themselves.
Michelle Galleger is pretty sharp....and yes she did rec .015....68 years old and been shootin for 56 years. Never loaded out further than .030 for benchrest or F-class shooting. Probably never will. Throat erosion is part of the game regardless of seating depth. I've got to admit we never stop learning and i'm sure not the smartest fella to ever load a round!
If Michelle Galleger didn't recommend full seating testing, as Berger does today, she was often wrong, and wrong to imply that she could predict where best seating is without full seating testing.
Throat erosion is a lot bigger deal to those relying on the high starting pressures with being ITL, than those who aren't.
If I find a good CBTO that is OTL, and my throat erodes 2", that same CBTO will re-test as best.
If I go with a CBTO that is ITL, and develop my load there, then it will take far less than 2" of erosion before results go south.
Throat erosion is a lot bigger deal to those relying on the high starting pressures with being ITL, than those who aren't.
If I find a good CBTO that is OTL, and my throat erodes 2", that same CBTO will re-test as best.
If I go with a CBTO that is ITL, and develop my load there, then it will take far less than 2" of erosion before results go south.
AckleymanII
Gold $$ Contributor
Try some 540 if you want to see some cracking and throat walking!
N550 specifically is what I use. Great accuracy. But H4350 and Reloder 17 are very accurate as well. I was pretty surprised to see how much errosion I had in 1000 rounds from a fairly small case capacity.
My 2 cents.
Have never shot 6 5x47 have always used 6x47 with hybrids, and h4350 . With that said in ohio 6.5 x47 seems to be used with 140 hybrids and elds and h4350 most guys getting 2000 rounds.
Have seen in the lands and off from alot of different shooters, i say do what works best for you and adjust as needed. My shooting buddy is using 130 bergers jammed. 012 shoots amazing. My self i usually start at .015 off and work from there. No matter what you decide great cal. choice, and shoot well.
Have never shot 6 5x47 have always used 6x47 with hybrids, and h4350 . With that said in ohio 6.5 x47 seems to be used with 140 hybrids and elds and h4350 most guys getting 2000 rounds.
Have seen in the lands and off from alot of different shooters, i say do what works best for you and adjust as needed. My shooting buddy is using 130 bergers jammed. 012 shoots amazing. My self i usually start at .015 off and work from there. No matter what you decide great cal. choice, and shoot well.
For the record if a rifle is shooting a cartridge that does not fit the "barrel burner" norms yet is scorching the throat in 1000 rounds those barrels are the perfect candidate for a set back and re-chamber. This is especialy true if SS is the material 416R does not work harden like 4150-4350 does so it is easy to do and to expect a great outcome. On the other hand if a barel is going south at 5000 rounds no point setting it back to re-chamber and re-crown. Just my opinion in this regard my own experience while positive is not a large enough data pool to be statistically significant to anyone but me!Also I will freq. take a competition barrel and turn it into a hunting rifle barrel for myself or other relatives.
Sixgun
The Millbastard
.050!!!
.050 in 1000 rounds!! Holy moly! Is your barrel done? I have 500 through my first 6547 using only h4350 and varget!!! I don't think it's close to .050 but I think I should check through 500 rounds...
No the barrel still shoots well. So far I should be able to get to 2000 rounds before I don't have enough neck left to jam the 130 Berger into the lands anymore. Then I'll either switch to a different bullet that doesn't need to be jammed to shoot well or rebarrel.
Unfortunately I don't have a bore scope to have a look at things. Maybe I got a barrel that wears quickly. I'm not sure.
AckleymanII
Gold $$ Contributor
540, 550, and 17 are rough on throats, add fire cracking for inches down the barrel. It is not just throat length but bore dia. that is being opened up by super cooking.
I have set back my own barrels with good results. When I can get the NEW throat dia the same as the muzzle dia, I expect great results. Key is to not wait too long. Be aware that Work hardened steel is rough on reamers.
Checking your throat wear on a regular basis is prudent, but can be a depressing reality that barrels are consumables.
I have set back my own barrels with good results. When I can get the NEW throat dia the same as the muzzle dia, I expect great results. Key is to not wait too long. Be aware that Work hardened steel is rough on reamers.
Checking your throat wear on a regular basis is prudent, but can be a depressing reality that barrels are consumables.
Thank you very much for the great advice. N550 was my primary powder for quite a while. I had asked my gunsmith about setting back the barrel a few months ago but I already have a new Krieger MTU to replace it with. I think that I'll have the bore checked with a bore scope and decide on either setting it back or rebarreling over the winter. I'm not a competitive shooter so it takes me a bit longer to rack up the rounds down range.
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