CLICK HERE for $50 INSTANT SAVINGS on Eligible NIKON MONARCH 5 BINOCULARS!
 

Topic Options
#7193424 - 12/17/12 7mm rm mag questions
7mmshawn Offline
Member

Registered: 12/15/12
Posts: 35
hey guys i new here and im a bit confused . ive been reloading for about 5 years now and i have 2 7 mags ive been playing with . ive been shooting 140 gr sierra game kings and speer 145 gr boat tails mostly with imr 4350 and fed 215s . im shooting 64 grains and these loads shoot awesome , pretty much one hole at 100yds . i was looking up data last night and wonder why there is so much load data difference and speed difference from book to book . for example nosler shows 65 gr max with imr4350 and another book says 60 gr max . and the speeds will be 2930 in one book and 3280 in noslers book . so i guess my question is what is the best way to find the max load in a rifle when you run across this problem . would it be better to use a chronogragh to try and get to the speeds shown in books or what ? ive never chronoed any of these loads but as far as i can tell there is no signs of extreme pressure in either gun . the primers look good , ive loaded most of the cases 4 or 5 times already , and the bolt is easy to open . any suggestions are appreciated .

Top
RV 728 BP
CLICK HERE for a GREAT DEAL on a HOWA 1500 from WHITTAKERS!
#7193531 - 12/17/12 Re: 7mm rm mag questions [Re: 7mmshawn]
BobinNH Offline
Campfire Oracle

Registered: 01/28/07
Posts: 30724
Shawn: Review a bunch of data from various sources,as many as possible and note correlations between charge weights and velocities...understand that your rifles may differ from the barrels used to aquire the data you are reviewing,and often by a substantial margin.This is true of any caliber, not just the 7 Rem mag.

Get a weighted "average" on the velocities and charge weights.Start low and work up,with a chronograph.Generally the faster you are going, the more pressure you are generating with a given powder....another powder may generate the same velocities with acceptable pressures ,ie be better suited to the combination you are using than another.

Without a chronograph you are working in the dark.

Try to use no more than one or two powder/bullet combos at a time to avoid jumping all over the place...this can lead to confusion and false results and no real conclusions.

When you think you have reached max for a trouble-free hunting load,take ten cases,and use the same max charges to check primer pocket tightness for several loadings in those ten cases.If your primer pockets stay relatively tight,and are absent of high pressure signs you are likely OK.

Sometimes this will correlate to listed data,and sometimes it won't.I would not be concerned.This is common with any cartridge; not just the 7 Rem Mag although the printed data does jump around.

What I do after all the other stuff above is done, is load a batch of ammo with that load and shoot year round;summer heat and winter cold,and watch the load.

This may not be perfect but is as close as we can get without pressure equipment for our rifles.

I have loaded for 7 Rem mags well into double figures.Using these methods I have not had so much as a hiccup with the cartridge,and great field performance from it as well...I can't even remember even getting an ejector mark on a case,and certainly never a blown primer.


I know the 4350's work in the 7 Rem Mag and some savy guys on here use it.I prefer something slower myself, but your work will tell you what works in your rifle.Good luck.

Welcome to the CF. smile
_________________________
You can't say very much on here without pissing at least SOMEBODY off-get used to it.

Top
#7194050 - 12/17/12 Re: 7mm rm mag questions [Re: BobinNH]
Dogshooter Offline
Campfire Ranger

Registered: 02/18/01
Posts: 2237
Loc: WCR 57/WCR 114, CO
In 24" barrel, my experience leads me to the following velocity thresholds with the 7RM:

120s - 3450ish
140s - 3350ish
150s - 3200ish
160s - 3050ish
175s - 2900+

Use your book (and your coconut) to get a good starting charge..... then work up. Good luck, and welcome.
_________________________
Counting all the azz holes in the room..... I'm definitely not alone.....

Top
#7196403 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
boomwack Offline
Campfire Regular

Registered: 12/27/11
Posts: 481
Loc: The Rockies
Welcome to the 'fire.

I also found Load data in manuals is a 'little' anemic and greatly varied for the 7mm rem mag. Chronograph some factory ammo.... most stuff will not be as stated.

Agreed with bob, no chrono your kinda in the dark. I recommend using one highly.

In the heavier weight bullets in my 7mm rem mag, my findings have been spot-on with dogshooters said velocity, but with 'rogue' charges compared to most manual. Other than limited loads with some 150 grainers, I have not done much work with 160 gr. and below.
_________________________
happiness is elbow deep in elk guts.
NRA life member

Top
#7196409 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
jwall Offline
Campfire Tracker

Registered: 09/06/10
Posts: 5299
Loc: Southern Arkansas
7mmshawn -

Welcome to the 'Fire', and sometimes it gets HOT round here.

BobNH has given very good advice per load development.

I use IMR 4350, knowing I could get a little more vel using slower burning powders. I am able to get the vel/accuracy I want.

Dogshooter - is also very close on expected vels.

Good Luck
_________________________
jwall
3100 guy.

There is no aftermarket FIX for operator error. jw


Top
#7196895 - 12/18/12 Re: 7mm rm mag questions [Re: jwall]
7mmshawn Offline
Member

Registered: 12/15/12
Posts: 35
thanks guys for the replys . it looks like i need a chrono to take to the range . i actually have one now but its wired for 110 so i only use it for archery work . and bobinnh thanks for the info on the 7mm mags . ive tried several slower powders and did not get the results i wanted as far as accuracy in both my 7 mags . i tried h1000 , retumbo , and 7828 but it could be bullet weights that i was shooting . i also tried rl22 and it shot good on 40 to 50 degree days and i went to shoot it on a day that 88 degrees and it was blowing primers out of the case so i stopped using hercules. i have shot the 4350 on days from 12 degrees to 90 with no issues so thats the only reason ive stuck with it .

Top
#7196969 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
Dogshooter Offline
Campfire Ranger

Registered: 02/18/01
Posts: 2237
Loc: WCR 57/WCR 114, CO
My brother runs 140 TTSX at 3250 with 63.5 grains of RE17 (Tikka T3)... which is quite similar to 4350.

You could also back that RE22 load off a grain and give it a run... IME, it's hot loads that tend to get real hot when the mercury perks. A grain or grain and a half reduction could lead to little lost on the top end, with a lot more stability when it gets hot.

I've also seen good loads go bad, when it's hot out and you let one stew a little in the pipe.
_________________________
Counting all the azz holes in the room..... I'm definitely not alone.....

Top
#7196989 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
Dogshooter Offline
Campfire Ranger

Registered: 02/18/01
Posts: 2237
Loc: WCR 57/WCR 114, CO
Originally Posted By: 7mmshawn
ive never chronoed any of these loads but as far as i can tell there is no signs of extreme pressure in either gun . the primers look good , ive loaded most of the cases 4 or 5 times already , and the bolt is easy to open . any suggestions are appreciated .


Originally Posted By: 7mmshawn

ive tried several slower powders and did not get the results i wanted as far as accuracy in both my 7 mags . i tried h1000 , retumbo , and 7828 but it could be bullet weights that i was shooting . i also tried rl22 and it shot good on 40 to 50 degree days and i went to shoot it on a day that 88 degrees and it was blowing primers out of the case so i stopped using hercules.


Didn't notice this before..... but it looks like you found your signs of pressure.

Classic example of without a chrony.... you're just guessin'. Even after you've got the chrony... it's just a informed guess.
_________________________
Counting all the azz holes in the room..... I'm definitely not alone.....

Top
#7197247 - 12/18/12 Re: 7mm rm mag questions [Re: Dogshooter]
7mmshawn Offline
Member

Registered: 12/15/12
Posts: 35
Originally Posted By: Dogshooter
Originally Posted By: 7mmshawn
ive never chronoed any of these loads but as far as i can tell there is no signs of extreme pressure in either gun . the primers look good , ive loaded most of the cases 4 or 5 times already , and the bolt is easy to open . any suggestions are appreciated .


Originally Posted By: 7mmshawn

ive tried several slower powders and did not get the results i wanted as far as accuracy in both my 7 mags . i tried h1000 , retumbo , and 7828 but it could be bullet weights that i was shooting . i also tried rl22 and it shot good on 40 to 50 degree days and i went to shoot it on a day that 88 degrees and it was blowing primers out of the case so i stopped using hercules.


Didn't notice this before..... but it looks like you found your signs of pressure.

Classic example of without a chrony.... you're just guessin'. Even after you've got the chrony... it's just a informed guess.

yeah i did see signs of pressure with rl22 but nothing else ive shot has . retumbo and h1000 just didnt shoot under an inch so its not for me . im still getting a chrono though for kicks , ill just tell my wife its for safety measures , lol .

Top
#7197486 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
17ACKLEYBEE Offline
Campfire Kahuna

Registered: 11/04/07
Posts: 19664
Loc: A wash in the west.
Hornady Vol. II is your huckleberry!
They have loads for the 139 Gr. Interlock of 3350 to 3400 both loads will chronograph at those speeds out of a 24" barrel.


Edited by 17ACKLEYBEE (12/18/12)
_________________________
NRA Lifetime Member

Top
#7197522 - 12/18/12 Re: 7mm rm mag questions [Re: 7mmshawn]
bsa1917hunter Offline
Campfire Kahuna

Registered: 08/12/10
Posts: 21290
Loc: Orygun
Originally Posted By: 7mmshawn
hey guys i new here and im a bit confused . ive been reloading for about 5 years now and i have 2 7 mags ive been playing with . ive been shooting 140 gr sierra game kings and speer 145 gr boat tails mostly with imr 4350 and fed 215s . im shooting 64 grains and these loads shoot awesome , pretty much one hole at 100yds . i was looking up data last night and wonder why there is so much load data difference and speed difference from book to book . for example nosler shows 65 gr max with imr4350 and another book says 60 gr max . and the speeds will be 2930 in one book and 3280 in noslers book . so i guess my question is what is the best way to find the max load in a rifle when you run across this problem . would it be better to use a chronogragh to try and get to the speeds shown in books or what ? ive never chronoed any of these loads but as far as i can tell there is no signs of extreme pressure in either gun . the primers look good , ive loaded most of the cases 4 or 5 times already , and the bolt is easy to open . any suggestions are appreciated .


I love "1 hole" guns.... whistle. Fill us in on this sucker....Pics appreciated too...
_________________________
Originally Posted By: raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.


BSA

Top
#7197587 - 12/18/12 Re: 7mm rm mag questions [Re: bsa1917hunter]
7mmshawn Offline
Member

Registered: 12/15/12
Posts: 35
its not anything special to be honest . its just a 111 savage that just happens to shoot good . i do also have a win 70 7 mag that im working on but i need a good stock on it . i really havent shot it much since im waiting to project it . ill see if i can find some pics .

Top
#7198596 - 12/18/12 Re: 7mm rm mag questions [Re: 17ACKLEYBEE]
jwall Offline
Campfire Tracker

Registered: 09/06/10
Posts: 5299
Loc: Southern Arkansas
Originally Posted By: 17ACKLEYBEE
Hornady Vol. II is your huckleberry!
They have loads for the 139 Gr. Interlock of 3350 to 3400 both loads will chronograph at those speeds out of a 24" barrel.


Spot On! I've found a FEW loads there a little too WARM. Maybe lot/lot variation.

Nonetheless , approach ALL max loads w/care.
_________________________
jwall
3100 guy.

There is no aftermarket FIX for operator error. jw


Top
#7200463 - 12/19/12 Re: 7mm rm mag questions [Re: 7mmshawn]
bsa1917hunter Offline
Campfire Kahuna

Registered: 08/12/10
Posts: 21290
Loc: Orygun
Originally Posted By: 7mmshawn
its not anything special to be honest . its just a 111 savage that just happens to shoot good . i do also have a win 70 7 mag that im working on but i need a good stock on it . i really havent shot it much since im waiting to project it . ill see if i can find some pics .


No files on the savages. 9 times out of 10 they are shooters.....
_________________________
Originally Posted By: raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.


BSA

Top
#7201466 - 12/19/12 Re: 7mm rm mag questions [Re: jwall]
17ACKLEYBEE Offline
Campfire Kahuna

Registered: 11/04/07
Posts: 19664
Loc: A wash in the west.
Originally Posted By: jwall
Originally Posted By: 17ACKLEYBEE
Hornady Vol. II is your huckleberry!
They have loads for the 139 Gr. Interlock of 3350 to 3400 both loads will chronograph at those speeds out of a 24" barrel.


Spot On! I've found a FEW loads there a little too WARM. Maybe lot/lot variation.

Nonetheless , approach ALL max loads w/care.


Yah I guess that's why they tell you to drop back and work up. We all do that right?


Edited by 17ACKLEYBEE (12/19/12)
_________________________
NRA Lifetime Member

Top
#7201864 - 12/19/12 Re: 7mm rm mag questions [Re: 17ACKLEYBEE]
TakeEm Offline
Campfire Regular

Registered: 01/03/12
Posts: 542
Loc: SD
Bob nailed it.

Seat depth and primers can also be major factors in getting a particular load to shoot.


Edited by TakeEm (12/19/12)
Edit Reason: spellin
_________________________
"...I heard the voice of the Lord, saying, "Whom shall I send, and who will go for Us?" Then I said, "Here am I. Send me."
Isaiah 6:8



Top
#7205620 - 12/20/12 Re: 7mm rm mag questions [Re: TakeEm]
7mmshawn Offline
Member

Registered: 12/15/12
Posts: 35
can somebody tell me how to post pictures? i shot a few different loads today and wanted to get some feedback .

Top

Moderator:  RickBin, SYSOP 
RV 180 2
CLICK HERE for GREAT PRICES on LEUPOLD OPTICS at CAMERA LAND!
RV 160 1 2
RV 160 2 2
Who's Online
474 registered (1beaver_shooter, 257heaven, 257 mag, 117LBS, 223, 51 invisible), 993 Guests and 319 Spiders online.
Key: Admin, Global Mod, Mod
RV 160 3 2
Forum Stats
53,478 Registered Members
72 Forums
692,463 Topics
10,005,309 Posts

Most users ever online: 4,830 @ 12/02/14










Copyright © 2000-2015 24hourcampfire.com, Inc. All Rights Reserved.