Rem 7 1/2 primers

[woodchuck3574]

Can the Rem 7 1/2 primer be used safely in reloading .30 carbine ammo? book calls for 6 1/2 but I have an abundance of 7 1/2.

[gdmoody]

I don't use Remington so I don't know what 6 1/2 or 7 1/2 are.

If they are like small pistol and small rifle, if you start out at the lowest charge and work up it would be ok to use either.

[bobski]

6 1/2 were replaced by the 5 1/2 and 7 1/2.
problem with 6 1/2 was they were used across the board for everything and proved too hard for small cal's and too soft for big cal's.
so remington designed the 5 1/2 thick for pistol magnums where heavy primer strikes were seen, and 7 1/2 were made for smaller cal's with softer strikes.
i use 7 1/2 in 22 hornet. they are nice small cal bench rest primers.
as far as 30 carbine? instincts tell me that should be a 6 1/2, because 7 1/2 might get punctured with the heavy pin strike of a military spec firing pin assy.

my ref is handloaders digest 7th ed.

[armoredman]

I can't see that military firing pins would puncture a 7.5 since that's the one suggested to me to use in 5.56mm reloads...and they work perfectly in a military type action in that caliber for me.

[steve4102]

Originally Posted by bobski

6 1/2 were replaced by the 5 1/2 and 7 1/2.
problem with 6 1/2 was they were used across the board for everything and proved too hard for small cal's and too soft for big cal's.
so remington designed the 5 1/2 thick for magnums where heavy primer strikes were seen, and 7 1/2 were made thin for smaller cal's with softer strikes.
i use 7 1/2 in 22 hornet. they are nice small cal bench rest primers.
as far as 30 carbine? instincts tell me that should be a 5 1/2, because 7 1/2 might get punctured with the heavy pin strike of a military spec firing pin assy and being they are thinner primer faces.

my ref is handloaders digest 7th ed.

Think you have your figures crossed here.
The Rem 6 1/2 is a Small rifle primer designed for low pressure loads like the 22 Hornet. The Rem 7 1/2 is a Small rifle primer that works well with high pressure rounds like the 223.

The Rem 5 1/2 is a Small Pistol magnum Primer not a rifle primer. The 5 1/2, 6 1/2 and 7 1/2 are still available from Remington. 5 1/2 Pistol. 6 1/2 rifle low pressure and 7 1/2 rifle high pressure.

[bobski]

got lost in the translation.
you are right.
5 1/2 is pistol mag.
but my book shows the 6 1/2 was dropped. was it brought back recently?
if thats the case,them 7 1/2 would work in 30carbine.
update me, please, because im using 7 1/2 in low pressure 22 hornets only because i couldnt find 6 1/2's.

[medalguy]

Remington 6 1/2 is a small rifle primer
Remington 7 1/2 is a bench rest small rifle primer

7 1/2 is NOT a magnum primer, but it is manufactured to a tighter tolerance than the regular 6 1/2 primer. I was told by a Remington rep that the cup is slightly harder or thicker than the standard 6 1/2, so it's better for auto rifles, but later conversations with other Remington reps dispute the harder/thicker theory.

All I can tell you is I use them in .223/5.56 reloading and they work fine. I don't see any reason why they would not work equally well in .30 Carbine. As always when changing compoments, drop back 10% and work back up.

[steve4102]

From Remington:

In rifle cartridges, the 6-1/2 small rifle primer should not be used in the 17 Remington, 222 Remington, 204 Ruger or the 223 Remington. The 7-1/2 BR is the proper small rifle primer for these rounds.

Powder Valley and Graf's have 6 1/2 in stock. Midway has them out of stock "No Backorder". Maybe they have been discontinued, duno.

[steve4102]

Originally Posted by medalguy

Remington 6 1/2 is a small rifle primer
Remington 7 1/2 is a bench rest small rifle primer

7 1/2 is NOT a magnum primer, but it is manufactured to a tighter tolerance than the regular 6 1/2 primer. I was told by a Remington rep that the cup is slightly harder or thicker than the standard 6 1/2, so it's better for auto rifles, but later conversations with other Remington reps dispute the harder/thicker theory.

Actually the 7 1/2 is a Mag primer and a BR primer.

http://www.lasc.us/primerchart.htm

http://www.chuckhawks.com/primers.htm

[steve4102]

Note the flash from the Rem 7 1/2.

http://riflemansjournal.blogspot.com...mer-study.html

[bobski]

i started using 7 1/2 when 6 1/2 was no longer available.
so i will clean up my post like this...
5 1/2 is for mag pistol.
7 1/2 was the do all that replaced 6 1/2. they made it thicker to get rid of complaints of being soft.
so, that still leaves the possiblity of old 6 1/2's still being softer than 7 1/2. why else would they have discontinued them and create a 7 1/2?

i guess we need to now learn if the 30carbine is considered a hot round requiring the new 7 1/2?
if old books show 6 1/2 used for 30 carbine, odds are that data was old, before complaints started being reported ???

i would assume the 7 1/2 would be ok. agree?

this sure has opened a can of worms!

[steve4102]

The Rem 6 1/2 primer is still listed as a component on Remington's web site.

[bobski]

or, brought it back?
maybe they improved it and reintroduced it?

again i say, why would they create a 7 1/2 if 6 1/2 was just fine?
follow my thoughts?

[steve4102]

Originally Posted by bobski

or, brought it back?
maybe they improved it and reintroduced it?

again i say, why would they create a 7 1/2 if 6 1/2 was just fine?
follow my thoughts?

The 7 1/2 has a thicker cup and is a Mag primer. The 6 1/2 has a very thin cup and should not be used in high pressure rounds like the 223.

[bobski]

so i guess the original question was...is 30carbine considered a low pressure round that requires only a thin cup primer?
it could be asked: 'would a 7 1/2 be too thick for the 30carbine reciepe asking for 6 1/2?'

he asked us if the 7 1/2 could be used in place of the receipe calling for 6 1/2 primers?
whats your opinion?

[steve4102]

Originally Posted by bobski

so i guess the original question was...is 30carbine considered a low pressure round that requires only a thin cup primer?
it could be asked: 'would a 7 1/2 be too thick for the 30carbine reciepe asking for 6 1/2?'

he asked us if the 7 1/2 could be used in place of the receipe calling for 6 1/2 primers?
whats your opinion?

IMO, Yes, just start low and work up as always.