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Campfire Regular
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Campfire Regular
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I'm starting with my first 7mag and must say that I'm very surprised at the large variance between my loading manuals and recent online data by the powder Mfgs. Hogden is 5gr lower online than they were in the #26 manual for H1000 with 140 and 160gr bullets. I got frustrated, said F'it and exrapolated. Got 73gr under the 139 BTSP and 69 in the 160 AccuBond. Am I in the right ball park or will I need reconstructive surgery?
Normally I'd do a slow work up but I need a couple loads to test velocity and accuracy potential of a barrel before going further.
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Joined: Mar 2009
Posts: 4,404
Campfire Tracker
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Campfire Tracker
Joined: Mar 2009
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66.0grs of Reloader-22 seems to be about right.Checked my 200yd zero yesterday with 160gr Accubond @ 3000fps.Good enough for me to kill something. ![[Linked Image]](http://i346.photobucket.com/albums/p413/senderomod700/IMG_0065_zpsf2912f7c.jpg)
~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............
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Joined: Nov 2011
Posts: 30,951
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 30,951 |
160gr Accubond @ 3000fps.Good enough for me to kill something.
Actually, at normal hunting ranges, it's pretty close to perfect.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Aug 2005
Posts: 28,239
Campfire Ranger
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Campfire Ranger
Joined: Aug 2005
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66.0grs of Reloader-22 seems to be about right.Checked my 200yd zero yesterday with 160gr Accubond @ 3000fps.Good enough for me to kill something.
Both of my 7mags love this exact load.
It is irrelevant what you think. What matters is the TRUTH.
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Joined: Sep 2006
Posts: 23,626
Campfire Ranger
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Campfire Ranger
Joined: Sep 2006
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Really hard to beat those 2, in that order. But with 140/150's, H4350 & RL-19 can also be very good, especially in the accuracy department. MM
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Joined: Jul 2013
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Campfire Outfitter
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Campfire Outfitter
Joined: Jul 2013
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The 7mm Rem. Magnum is the one cartridge I would hesitate to ever post loads for. My best load for a 175 gr. bullet is about 4.5 gr. of powder over book max. but is just over 2900 fps. If I followed the book my loads would be anemic. To me this is one cartridge that absolutely requires you to use a chronograph to ensure you are getting what it is capable of.
I am sure there are lots of guns out there that will achieve the velocities predicted by the loading manuals at the listed powder charges but mine certainly isn't one of them. In case anyone is interested the rifle in question is a M70 Winchester Custom Super Grade.
Jim Jim I have seen the same thing with the M70's in 7RM. But it isn't unique to the 7 Rem Mag as I have seen it with the M70's chambered 300 Win Mag as well. Matter of fact it is so common I am no longer surprised when it happens.  Hey Bob! I hope your hunting season went well, and that you are settling into a joyful holiday season. Since you mention M70's and needing more powder in magnum cases to get appropriate speeds, I'm wondering if you've seen it in the WSM's as well in M70's. Any theories why this model act this way?
I belong on eroding granite, among the pines.
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Joined: Aug 2013
Posts: 205
Campfire Member
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Campfire Member
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For 140's R19 works well also. 140 TTSX and 64 grains R19. 3200 fps 1/2 moa. Very forgiving load in my rifle. Shoots .6 or less from 63 to 64 gr. IMR 4350 and a 140 or 150 is a very good combo. The 140 accubond and 4350 was almost as good in my rifle. For the heavier bullets R 22.
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Joined: Aug 2005
Posts: 1,741
Campfire Regular
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Campfire Regular
Joined: Aug 2005
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65gr RE22 gets me 3013fps average out of a 26" Pacnor using the 160gr Accubond. 66gr RE22 gets 3158fps with the 140gr Ballistic tip. 65gr gets 3057 with the Sierra 160gr HPBT. The Best load in my Rifle is 63gr RE22 175gr Sierra SPBT at 2900fps. My Old barrel liked H4831 and the 140gr Ballistic tip.
The anti American Constitutional party (Democrat). Wants to dismantle your rights, limiting every aspect of your constitutional rights. Death by 1000 cuts is the tactic. Each cut bleeds constitutional rights to control you. Control is the goal.
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Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
The 7mm Rem. Magnum is the one cartridge I would hesitate to ever post loads for. My best load for a 175 gr. bullet is about 4.5 gr. of powder over book max. but is just over 2900 fps. If I followed the book my loads would be anemic. To me this is one cartridge that absolutely requires you to use a chronograph to ensure you are getting what it is capable of.
I am sure there are lots of guns out there that will achieve the velocities predicted by the loading manuals at the listed powder charges but mine certainly isn't one of them. In case anyone is interested the rifle in question is a M70 Winchester Custom Super Grade.
Jim Jim I have seen the same thing with the M70's in 7RM. But it isn't unique to the 7 Rem Mag as I have seen it with the M70's chambered 300 Win Mag as well. Matter of fact it is so common I am no longer surprised when it happens. Hey Bob! I hope your hunting season went well, and that you are settling into a joyful holiday season. Since you mention M70's and needing more powder in magnum cases to get appropriate speeds, I'm wondering if you've seen it in the WSM's as well in M70's. Any theories why this model act this way? HuntNShoot: My "experience" with WSM's is limited to 7-8 rifles IIRC. But I notice the 300 WSM has run pretty close to what the manuals say with more or less standard charges. It seems to me to be the easiest of the WSM's to hand load. I got a bit over 3000 fps from the 160 in the 7mm WSM ( two rifles that I recall);and about 3225 from the 270 WSM with 130's. But in the 7mm and 270 WSM I was not comfortable trying to duplicate factory ammo velocities. Seems the stuff is loaded with dynamite.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Jul 2013
Posts: 9,189
Campfire Outfitter
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Campfire Outfitter
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Bob, I've seen exactly (1) M70 in 7 WSM, and it has to be loaded well over book to get appropriate numbers, which is why I asked. It tends to be off by 100 fps, or a little bit more, from the proper numbers. Surprising since it has the 24" bbl. It gets loaded hothot, and shoots incredibly well that way, but still doesn't quite meet what factory ammo is supposed to do.
I belong on eroding granite, among the pines.
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Joined: Sep 2006
Posts: 23,626
Campfire Ranger
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Campfire Ranger
Joined: Sep 2006
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Have you checked factory ammo? I don't know anyone who has so it would be good to get some real info.
After having several 7mm Rem Mags,I've come to the conclusion that getting the full potential out of it requires throating it..........the short throats that many guns have never reach full potential.
The ones I've throated were set up to have a 160 NPT seated to the base of the neck with the bullet .010" off the lands.
With that setup & RL-22, 3175FPS (chrono'ed) is easily achievable.
Same type setup for a 300 Win Mag.
But I'm done with them...........270/280/30-06 is fine for me; if I want something bigger, it's a 338.
JME
MM
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Joined: Jul 2013
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Campfire Outfitter
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Campfire Outfitter
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Montana Man, factory ammo has ne'er sullied the bore of that fine rifle. Well, it's a fine shooter, anyway. The rifle is big and heavy, and a pain to pack, but it shoots heavies into tiny groups.
Some day when I have more disposable income, I want to build a rifle or two around specific bullets and terrain.
I belong on eroding granite, among the pines.
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Joined: Sep 2005
Posts: 284
Campfire Member
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Campfire Member
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I tried other powder but settled on H-1000 with 140-150 grain bullets.
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Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
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MM/Jason:Off topic, but I checked the Federal Premium factory ammo with 160 NPT in the 7mm WSM. From two rifles (a Kimber Montana and a M70 FW) the stuff gave 3250-3260 in both rifles,along with swollen brass and ejector slot marks. I contacted Federal; they said the stuffs loaded to 65,000 psi. Well.....maybe Handloads at a bit over 3000 fps shot fine.
Last edited by BobinNH; 12/10/14.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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