Enfield in 7.62x54R ?
- Thread starter truenorth777
- Start date
Just going by Wikipedia, not that they are the holey grail or anything but
7.62x54r pressure is 54.000 psi
303 brit pressure is 49.000 psi
So you may have to dial the power back a little.
For the 303 Brit
Case type Rimmed, bottleneck
Bullet diameter 0.312 in (7.9 mm)
Neck diameter 0.338 in (8.6 mm)
Shoulder diameter 0.401 in (10.2 mm)
Base diameter 0.460 in (11.7 mm)
Rim diameter 0.540 in (13.7 mm)
Rim thickness .064 in (1.6 mm)
Case length 2.222 in (56.4 mm)
Overall length 3.075 in (78.1 mm)
Case capacity 55.7 gr H2O (3.621 cm³)
Rifling twist 1-10 inches (250 mm)
Primer type Large rifle
Maximum pressure 49,000 psi
Maximum CUP 45,000 CUP
For the Russian
Case type Rimmed, Bottleneck
Bullet diameter 7.92 mm (0.312 in)
Neck diameter 8.53 mm (0.336 in)
Shoulder diameter 11.61 mm (0.457 in)
Base diameter 12.37 mm (0.487 in)
Rim diameter 14.40 mm (0.567 in)
Rim thickness 1.6 mm (0.063 in)
Case length 53.72 mm (2.115 in)
Overall length 77.16 mm (3.038 in)
Case capacity 4.16 cm³ (64 gr H2O)
Rifling twist 240 mm (1 in 9.45 in)
Primer type Berdan or Boxer Large Rifle
Maximum pressure 390 MPa (57,000 psi)
I do know that globe took a bunch of stv 38 and stv 40's and rechambered them to 303 brit. didn't work very well on a semi auto but I have no opinion on if it would or would not work on the Lee-Enfield.
7.62x54r pressure is 54.000 psi
303 brit pressure is 49.000 psi
So you may have to dial the power back a little.
For the 303 Brit
Case type Rimmed, bottleneck
Bullet diameter 0.312 in (7.9 mm)
Neck diameter 0.338 in (8.6 mm)
Shoulder diameter 0.401 in (10.2 mm)
Base diameter 0.460 in (11.7 mm)
Rim diameter 0.540 in (13.7 mm)
Rim thickness .064 in (1.6 mm)
Case length 2.222 in (56.4 mm)
Overall length 3.075 in (78.1 mm)
Case capacity 55.7 gr H2O (3.621 cm³)
Rifling twist 1-10 inches (250 mm)
Primer type Large rifle
Maximum pressure 49,000 psi
Maximum CUP 45,000 CUP
For the Russian
Case type Rimmed, Bottleneck
Bullet diameter 7.92 mm (0.312 in)
Neck diameter 8.53 mm (0.336 in)
Shoulder diameter 11.61 mm (0.457 in)
Base diameter 12.37 mm (0.487 in)
Rim diameter 14.40 mm (0.567 in)
Rim thickness 1.6 mm (0.063 in)
Case length 53.72 mm (2.115 in)
Overall length 77.16 mm (3.038 in)
Case capacity 4.16 cm³ (64 gr H2O)
Rifling twist 240 mm (1 in 9.45 in)
Primer type Berdan or Boxer Large Rifle
Maximum pressure 390 MPa (57,000 psi)
I do know that globe took a bunch of stv 38 and stv 40's and rechambered them to 303 brit. didn't work very well on a semi auto but I have no opinion on if it would or would not work on the Lee-Enfield.
Consider this:
Base diameter of .303" = .458"
Base diameter of 7.62 = .484"
Area of .303" base = .458/2 x 3.14159 = .1647 square inch.
Area of 7,62 base = .484/2 x 3.14159 = .1839 square inch
Ratio therefore is .1839/.1647 = 1.1116 in favour of the 7.62 or 1.112 for short.
Bolt THRUST therefore will be the Ratio of the base areas times the Chamber Pressure, which we already know are in a ratio of (57000/45000=) 1.267.
SO 1.267 x 1.112 = 1.408904 or, for short, 1.409 TIMES the thrust ALREADY on the Lee-Enfield bolt...... which is well known to be springy already.
OR, if you work it from the RIM diameters, you are looking at .530" versus .564. This is because the cartridges are a single piece each and thus exert thrust according to the RIM areas. Here, we get:
.530/2 x 3.14159 = .2206 sq inch versus .564/2 x 3.14159 = .2498 sq inch for a ratio of .2498/.2206 = 1.132
and a Thrust ratio of 1.132 x 1.267 = 1.434 TIMES the thrust normally there.... on a springy bolt.
I certainly wouldn't pull the trigger on it.
Nor would I advise anyone else even to think of it.
.
Base diameter of .303" = .458"
Base diameter of 7.62 = .484"
Area of .303" base = .458/2 x 3.14159 = .1647 square inch.
Area of 7,62 base = .484/2 x 3.14159 = .1839 square inch
Ratio therefore is .1839/.1647 = 1.1116 in favour of the 7.62 or 1.112 for short.
Bolt THRUST therefore will be the Ratio of the base areas times the Chamber Pressure, which we already know are in a ratio of (57000/45000=) 1.267.
SO 1.267 x 1.112 = 1.408904 or, for short, 1.409 TIMES the thrust ALREADY on the Lee-Enfield bolt...... which is well known to be springy already.
OR, if you work it from the RIM diameters, you are looking at .530" versus .564. This is because the cartridges are a single piece each and thus exert thrust according to the RIM areas. Here, we get:
.530/2 x 3.14159 = .2206 sq inch versus .564/2 x 3.14159 = .2498 sq inch for a ratio of .2498/.2206 = 1.132
and a Thrust ratio of 1.132 x 1.267 = 1.434 TIMES the thrust normally there.... on a springy bolt.
I certainly wouldn't pull the trigger on it.
Nor would I advise anyone else even to think of it.
.
3.14159 ?
Only 5 decimal places?
Gee sloppy- Pi is known to the millionth decimal place. (at least {so far})
So it is even worse than you calculate -no trigger pulling for me on that gun...
A proof round every time!
I may not be pretty- but I don't want my face mangled.
Only 5 decimal places?
Gee sloppy- Pi is known to the millionth decimal place. (at least {so far})
So it is even worse than you calculate -no trigger pulling for me on that gun...
A proof round every time!
I may not be pretty- but I don't want my face mangled.
Hey, flesh heals. Milsurps don't.
I'm not sure why one would go to the trouble and expense of bubbaing an Enfield to shoot 7.62 Russian when there are 91/30's selling for peanuts; buying the Mosin will save both money and historic firearms.
- Location
- Southern Vancouver Island
Like others have stated, get yourself a Mosin Nagant with a good chamber and bore.
They can be very accurate rifles when properly tuned and fed with the right ammo.
A good choice for a caliber change on a No.4 Lee Enfield would be a re-barrel in
.375 Winchester. This, to me would be a real fun 10 shot bush gun.
I'm gonna build up one after I do my .458 magnum "Bush Buddy"
carbine project.
"Here....moosey, moosey, moosey!"
They can be very accurate rifles when properly tuned and fed with the right ammo.
A good choice for a caliber change on a No.4 Lee Enfield would be a re-barrel in
.375 Winchester. This, to me would be a real fun 10 shot bush gun.
I'm gonna build up one after I do my .458 magnum "Bush Buddy"
carbine project.
"Here....moosey, moosey, moosey!"
dgradinaru
CGN frequent flyer
- Location
- British Columbia
Might as well get a 100$ Mosin....lol saves future problems. And it does not cost alot.
What would make just as much sense would be to set up and handload your .303s.
My match-grade range ammo costs me $12 a box to load. It is more accurate than any factory ammo.
My plinking loads cost $2 a box.
I bought the equipment over the years, starting with the press in 1965. It still works fine.
And it's fun to do.
.
My match-grade range ammo costs me $12 a box to load. It is more accurate than any factory ammo.
My plinking loads cost $2 a box.
I bought the equipment over the years, starting with the press in 1965. It still works fine.
And it's fun to do.
.
And let's not forget that the cheap surplus ammo isn't all that consistent.
Smellie's got the answer in the post above mine. Tell him to get into reloading. For something that isn't shot a lot a very modest reloading setup will only put him back about $120 to $150. And then he's got better hunting ammo for around $7 to $8 per 20 rounds even if he buys some of the fancier bullets available. (reference for bullet costs from Budget Shooters, one of the sponsors with the link up top.)
Smellie's got the answer in the post above mine. Tell him to get into reloading. For something that isn't shot a lot a very modest reloading setup will only put him back about $120 to $150. And then he's got better hunting ammo for around $7 to $8 per 20 rounds even if he buys some of the fancier bullets available. (reference for bullet costs from Budget Shooters, one of the sponsors with the link up top.)
