does any one know if there ever was a study done to the amount of throat erosion in thousandths as pertaining to the amount of rounds shot in a stainless 6br bench gun
6br throat erosion question ?
- Thread starter bigstick6017555
- Start date
dmoran
Donovan Moran
There are many dependent aspects:
- Cleaning procedures
- Number of rounds fired between cleanings
- Rate of fire
- Bullets size/weight
- Powder burn rate, heat rate, and charge
- Velocity and Pressure
etc...
Where to say one guy may run small/short strings and get great barrel life compared to another on the same load/ammo that runs longer strings.
Or one guy shooting 70gr bullets at 3200-fps verses another shooting 105gr bullets at 2800-fps.
Just to many variables to have a correct answer like your looking for, or so is my input and experience.
Donovan
- Cleaning procedures
- Number of rounds fired between cleanings
- Rate of fire
- Bullets size/weight
- Powder burn rate, heat rate, and charge
- Velocity and Pressure
etc...
Where to say one guy may run small/short strings and get great barrel life compared to another on the same load/ammo that runs longer strings.
Or one guy shooting 70gr bullets at 3200-fps verses another shooting 105gr bullets at 2800-fps.
Just to many variables to have a correct answer like your looking for, or so is my input and experience.
Donovan
I've checked 2 Dashers and 2 6brs all 8 and 10 twists shooting 90 and 107gr bullets not shooting hot at several different round counts and all 4 were .003 every 100 rounds. Checked with Sinclair seating depth tool. All they were shot was load development, varmint matches, and a couple 600 yd matches, never on prarie dogs or other critters. Most Varget and some RE 15
AckleymanII
Gold $$ Contributor
When shooting p. dogs hot and heavy with the 6 BR, we used to dump out 50 and shoot them as fast as we could acquire targets. The load was in the range of 32.5+ of h335 with 60g Sierra HP out of 1-12-1-14 twist barrels. The most leade growth was .070 in 1800 rounds of pure abuse on a barrel, cleaning every 250-300 rounds, we shot until we could not see out of the scope.
We used Hart barrels and had a reamer gound with zero freebore. Obviously, this load is very easy on barrels. We sat the barrel back every 1800-2500 rounds, starting off at 29"-30" with a MHV contour that had 6" of straight shank on the chamber end. We used a Gritter's rod with over size bushings to determine approximately how much needed cutting off for the re-chamber. We got 4 chambers on a barrel at least. By that time, the barrels had got hard to clean with copper fouling, so we screwed on another barrel, but accuracy was usually in the high 2's or low 3's over 5+ five shot groups.
We did not get the same rate of throat wear with H322, the throat grew more than it did with H335.
The accuracy and speed is fantastic with H335 and AA2230 with bullet weights up to 70g which is as heavy as I shot. Speed ,and accuracy with the H335 and the 70g exceeded H322 by 200 fps on a 26" barrel.
Gene Harwood turned me on to the virtues with H335, he was NBRSA director, and sat a World Record with his 6 BR while shooting a 24" MHV 1-14 twist with his own 60g Bullets at 3700 fps.
7 1/2 primers or CCI450's are the way to go with H335, thick cup primers and Max flame.
We used Hart barrels and had a reamer gound with zero freebore. Obviously, this load is very easy on barrels. We sat the barrel back every 1800-2500 rounds, starting off at 29"-30" with a MHV contour that had 6" of straight shank on the chamber end. We used a Gritter's rod with over size bushings to determine approximately how much needed cutting off for the re-chamber. We got 4 chambers on a barrel at least. By that time, the barrels had got hard to clean with copper fouling, so we screwed on another barrel, but accuracy was usually in the high 2's or low 3's over 5+ five shot groups.
We did not get the same rate of throat wear with H322, the throat grew more than it did with H335.
The accuracy and speed is fantastic with H335 and AA2230 with bullet weights up to 70g which is as heavy as I shot. Speed ,and accuracy with the H335 and the 70g exceeded H322 by 200 fps on a 26" barrel.
Gene Harwood turned me on to the virtues with H335, he was NBRSA director, and sat a World Record with his 6 BR while shooting a 24" MHV 1-14 twist with his own 60g Bullets at 3700 fps.
7 1/2 primers or CCI450's are the way to go with H335, thick cup primers and Max flame.
dmoran said:
That sums up the question rather nicely in my book!
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