AN DU RU FOX
Well-Known Member
.musics a pain but.
something to watch
- Thread starter AN DU RU FOX
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MTLEADFARMER
Well-Known Member
My Springfield Supermatch has a Douglas barrel, one of the most accurate rifles I own.
I have a number of Douglas barrels and also Obermeyer who makes barrels with tight bores. I have a 308 barrel that is .298"X3055" with 13.8" twist barrel and it shoots very well. About all my Douglas barrels are 5A contours so they can be set back easily.
MTLEADFARMER you can only rebarrel the 03 Springfield action about 50 times. That is the action that the ammunition acceptances barrels are fitted it and they are rebarreled over and over and over.
MTLEADFARMER you can only rebarrel the 03 Springfield action about 50 times. That is the action that the ammunition acceptances barrels are fitted it and they are rebarreled over and over and over.
What the hell have you been shooting to know that?
I guess who started the tight barrel was the Canadians. Least ways that is the first I heard of them. I was on the 82 Palma Team and we went to Canada and we were told that their bores were tighter than ours and that gave them more velocity and uniformed their bullet diameters as their bullet diameters ran on the small side for some reason. For instance I bought some surplus 150 grain ball bullets and they measured .307 instead of .308. I had two tight barrels when I went for that match, the other was a .307 bore. My 307 shot their ammo better than the .3055 so that is what I shot their championship with.
Barrels also tend to shoot better if they get a tad tighter as the bullet goes down bore.
I ideal bore has two situations that make a difference. The ideal barrel configuration is called a "gain twist squeeze bore" which means the bullet travels with minimum rotation a few inches then the rifling becomes faster and gets progressively tighter towards the muzzle. You will see gain twist in 20MM Vulcan cannon barrels.
When barrels are made it is hard to tell which end is tight as they are like 1 1/4" all the way to the muzzle so the manufacturers air gage them and stamp the data on the big end so you know which end to chamber.
If you just pick one up not marked and happen to get the big end at the muzzle it will not shoot well.
The big problem is you can have gain twist or sqeeze bore but manufacturing a barrel with both in same barrel is possible and to my knowledge only barrels made so were experimental and they proved the concept, just couldn't afford to buy them.
Obermeyer figured out a 13.8 twist was the ideal twist rate for 168s and that was confirmed when I shot tight groups at 200 yards with 168s and 173 grain bullets were keyholing and never stabilized.
When I shoot the 3055 here with 168s and I have to reduce the load I used for standard 308 barrels down to 37 grs from 40 grains of 4895 and it shoots very well.
At one time I had a source that went to Canada and he brought back used barrels at a real good price and he put a tight one on a 30-40 Krag rifle I got that dirt dobbers and built a nest in and ruined it. At any rate me duplicated the factory taper and it is one of my favorite rifles. Forgot to add it is not really a rifle but a cavalry carbine and stock is dated 1901.
Thus all my target barrels I bought were 12 twist in 30 cal. A 12 will stabilize a 190 gr bullet to 1000 yards and that was the twist rate on the 76 Palma Rifles.
If any of you guys are near Bisley call Fulton's and ask them what the bore dimensions are for No 4 Rifles rebarreled to 7.62. Also ask the twist rate they put in them. I have a No 4 Fulton Regulation Rifle in my collection with a 7.62 Magazine I have had since 76. Also ask they what they get for this rifle now or if no longer made what is one worth?
Barrels also tend to shoot better if they get a tad tighter as the bullet goes down bore.
I ideal bore has two situations that make a difference. The ideal barrel configuration is called a "gain twist squeeze bore" which means the bullet travels with minimum rotation a few inches then the rifling becomes faster and gets progressively tighter towards the muzzle. You will see gain twist in 20MM Vulcan cannon barrels.
When barrels are made it is hard to tell which end is tight as they are like 1 1/4" all the way to the muzzle so the manufacturers air gage them and stamp the data on the big end so you know which end to chamber.
If you just pick one up not marked and happen to get the big end at the muzzle it will not shoot well.
The big problem is you can have gain twist or sqeeze bore but manufacturing a barrel with both in same barrel is possible and to my knowledge only barrels made so were experimental and they proved the concept, just couldn't afford to buy them.
Obermeyer figured out a 13.8 twist was the ideal twist rate for 168s and that was confirmed when I shot tight groups at 200 yards with 168s and 173 grain bullets were keyholing and never stabilized.
When I shoot the 3055 here with 168s and I have to reduce the load I used for standard 308 barrels down to 37 grs from 40 grains of 4895 and it shoots very well.
At one time I had a source that went to Canada and he brought back used barrels at a real good price and he put a tight one on a 30-40 Krag rifle I got that dirt dobbers and built a nest in and ruined it. At any rate me duplicated the factory taper and it is one of my favorite rifles. Forgot to add it is not really a rifle but a cavalry carbine and stock is dated 1901.
Thus all my target barrels I bought were 12 twist in 30 cal. A 12 will stabilize a 190 gr bullet to 1000 yards and that was the twist rate on the 76 Palma Rifles.
If any of you guys are near Bisley call Fulton's and ask them what the bore dimensions are for No 4 Rifles rebarreled to 7.62. Also ask the twist rate they put in them. I have a No 4 Fulton Regulation Rifle in my collection with a 7.62 Magazine I have had since 76. Also ask they what they get for this rifle now or if no longer made what is one worth?
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hybridfiat
Well-Known Member
Lovely barrels.
I have one still it is on my .35 Whelen R.
When I went to fit a new old stock cut rifled Sprinter barrel a few months ago I found after I'cut it to length the bore was 1.5mm off center.
Contrast that with my 6mm BR barrel from MAB that was 3/10,000" out of true.
I have one still it is on my .35 Whelen R.
When I went to fit a new old stock cut rifled Sprinter barrel a few months ago I found after I'cut it to length the bore was 1.5mm off center.
Contrast that with my 6mm BR barrel from MAB that was 3/10,000" out of true.
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