Has anyone played around with the idea of 7x47L. (Why heck, we can call it the 747 Boeing.) That would be a 6.5x47 Lapua case necked up to 7mm. It sounds like it could be a very efficient cartridge using a 450 CCI primer and some slower burning powder such as RL19 or H4831. There is a large selection of 7mm bullets from 100 grains going all the way up to 168 grainers and higher. I don't know, maybe I've been thinking too much!
Thoughts about 7x47L
- Thread starter ALO
- Start date
I'm patiently waiting...what weight of bullet, what velocity?
billbonser
Gold $$ Contributor
The short answer is yes. Nothing new. Called the 7mm IHMSA.
The 7x47mm concept was developed by my good friend John Adams, the founder of IHMSA, and was “THE HOT NUMBER†in handgun silhouette for over 10 years. The cartridge is based on a neck downed 300 Savage case (measuring 47mm long), and takes the large rifle primer, and had a sharp aprox. 38 degree shoulder. Loading data was published in most of the reloading manuals of the time. IMR 4895 and WW 748 were popular with 160 to 168 grain bullets which were just the ticket to take over the hard set rams of the day. 175 Sierra's shot well in my XP100 as well. Later on Elgin Gates took credit for it when he was heading up IHMSA,
I built, and still have, a 7mm IHMSA or 7mm x 47mm, rifle built with a Rem. 700 action, with a match Hart barrel. It is a truly fine shooter.
I see the reamers are available from Pacific Tool. I also see dies on ebay all the time for this chamber.
Sure you could change the shoulder angle, or move the shoulder back and make it into something else if one wants to. All the ground work has been done without having to make custom dies at a big cost. And all you have to do is fire form a 6.5x47 Lapua case in the chamber if you want a small primer.
Photos below; 7mm IHMSA on left - 6x47mm on right. And the IHMSA headstamp.
The 7x47mm concept was developed by my good friend John Adams, the founder of IHMSA, and was “THE HOT NUMBER†in handgun silhouette for over 10 years. The cartridge is based on a neck downed 300 Savage case (measuring 47mm long), and takes the large rifle primer, and had a sharp aprox. 38 degree shoulder. Loading data was published in most of the reloading manuals of the time. IMR 4895 and WW 748 were popular with 160 to 168 grain bullets which were just the ticket to take over the hard set rams of the day. 175 Sierra's shot well in my XP100 as well. Later on Elgin Gates took credit for it when he was heading up IHMSA,
I built, and still have, a 7mm IHMSA or 7mm x 47mm, rifle built with a Rem. 700 action, with a match Hart barrel. It is a truly fine shooter.
I see the reamers are available from Pacific Tool. I also see dies on ebay all the time for this chamber.
Sure you could change the shoulder angle, or move the shoulder back and make it into something else if one wants to. All the ground work has been done without having to make custom dies at a big cost. And all you have to do is fire form a 6.5x47 Lapua case in the chamber if you want a small primer.
Photos below; 7mm IHMSA on left - 6x47mm on right. And the IHMSA headstamp.
Attachments
Alo:
You want loading suggestions ? It's all done for you.
back in 1967 I developed a cartridge that I named the "7mm IHMSA".
The original tool was ground, hands on by Dave Kiff of Pacific tool fame
while he worked for Jim at JGS.
I donated the design and name to the IHMSA organization that was being
run by Elgin Gates at the time. I was still very involved with them as I was the
original founder of IHMSA.
If you look up 7mm IHMSA on the internet you will find thousands of loads.
The hornady Bullet Co. ( Ron Reiber ) borrowed my personal gun to do the
load development with for their loading manual.
loading dies are readily available from RCBS. The made the original loading dies.
As far as bullets go the Hornady 162 grn. spbt was "The bullet" to use. The 140
grn. from Speer was also a good choice. But, were not as reliable on the hard
set rams. The powder of choice was H-4895 with W-W 748 as a backup.
Velocity out of a 16" pistol was 2450 fps. But the 162 grn. spbt was a
sure thing on the hard set steel rams.
The 7mm IHMSA brass was formed by using 300 Savage cases In my
development of this cartridge I found that was much easier to neck down
a .30 caliber case than it was to neck up a .22-250 case. The can can be fire
formed from .22-250, 6.5x47 Lapua, Rem.br brass, The 250 / .300 Savage
and later on it was mfg. by Federal with the 7mm IHMSA headstamp. I believe
they made at least 150000 of them, I have lots both in nickle and brass.
John
You want loading suggestions ? It's all done for you.
back in 1967 I developed a cartridge that I named the "7mm IHMSA".
The original tool was ground, hands on by Dave Kiff of Pacific tool fame
while he worked for Jim at JGS.
I donated the design and name to the IHMSA organization that was being
run by Elgin Gates at the time. I was still very involved with them as I was the
original founder of IHMSA.
If you look up 7mm IHMSA on the internet you will find thousands of loads.
The hornady Bullet Co. ( Ron Reiber ) borrowed my personal gun to do the
load development with for their loading manual.
loading dies are readily available from RCBS. The made the original loading dies.
As far as bullets go the Hornady 162 grn. spbt was "The bullet" to use. The 140
grn. from Speer was also a good choice. But, were not as reliable on the hard
set rams. The powder of choice was H-4895 with W-W 748 as a backup.
Velocity out of a 16" pistol was 2450 fps. But the 162 grn. spbt was a
sure thing on the hard set steel rams.
The 7mm IHMSA brass was formed by using 300 Savage cases In my
development of this cartridge I found that was much easier to neck down
a .30 caliber case than it was to neck up a .22-250 case. The can can be fire
formed from .22-250, 6.5x47 Lapua, Rem.br brass, The 250 / .300 Savage
and later on it was mfg. by Federal with the 7mm IHMSA headstamp. I believe
they made at least 150000 of them, I have lots both in nickle and brass.
John
SongdogHunter
Gold $$ Contributor
i mocked one up... Peaked my interest. but what does it give up to the 7-08? It would have better brass but at the expense of a reamer and custom dies.
I've done a .20, and a .25 and have a 6mm and 6.5 why not a 7mm
SDH
I've done a .20, and a .25 and have a 6mm and 6.5 why not a 7mm
SDH
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.