Home Forums Reloading Big Game Rifles 7SAUM - AGAIN

I haven't broke 3000 with any 160 load - and have gotten stiff bolt lift at a couple of max charges. I had an issue with this rifle when I first got it with respect to showing pressure signs. During my barrel break-in, scope sighting etc, I always load 10-20 low-mid rnage loads just to get it on paper and "break" in the barrel. I was getting ejector marks on the cases at minimum charges and velocity. Took it to a local gunsmith specializing in M700's and he found a small rough spot near the shoulder/neck junction. He surmissed the finish reamer didn't quite finish the chamber which lead to a couple thousands bump in the shoulder. He polished the area and all has been well. I think the problem is solved but I suspect my chamber isn't perfect and does give me pressure signs at max loads.

If you have preasure signs I guess that is it....Try some Reloader 17 if you want speed.....Gave me extra in my 243AI and SAUM...the 243AI went faster than N560, W760, AR2209 (4350), 2213SC with all taken to preasure signs...the 17 was a good 100fps faster in a 22" tube but I stuck with the tried and trued at this stage untill I have the time to test seating depths etc as the groups were average

The pics of the weekends groups at 100Yrds



and this is the 3 groups traced (59, 59.5, 60)



Quite happy with the results...especialy with those targets as I prefer a squate or diamond to line up on...with the square aiming for a corner or diamond with the crosscrossing each corner...the circle center is harder to get exactly the same...
Will be loading 59.5 again to check FPS and confirm the groups

FWIW.. And to add to the discussion..

I ran 120 TTSX's over 63 1/2 grains of H4350 today for sub MOA groups at 3387 fps. avg.

I'm going to have trouble picking a load to work with this season.

That's pretty good... It's going to be hard to leave that 7saum at home!

It might be going for lots of trips this year, and making a lot of other rifles jealous..

Hey L,

Good shooting! What is the velocity of the Re 17 and associated charge weights you have in the picture?

I have to say, I'm really growing fond of my SAUM as well. Near 7 mag performance with less recoil in a 7.5 lb rifle. I'm also digging my 300 SAUM as well. Re 17 has given me 3000+ ft/sec with a 180 - in a light rifle and at acceptable recoil. Much to like in both.

The picture is ADI AR2209 (same powder as H4350) 59.5 with the 140VLD Hunting pill, 7 1/2lb hunting rig built on a Mod 7 KS with a 24" tube and I didn't get a read on the chrony.. Error2....fading light so will load some more and chrony them again and may try some RL17 with the 140's as well

The RL17 groups are further down my pile of targets (will have a gander when time permits) and are OK but not quite as tight but I haven't tried it with the 140's yet just the 162 amax up to 3150fps with tight lift, 3080 no preasure

I am also loading for a 7mm Rem mag but it kicks like a mule compared to the mod7 although it is 1/2 lb lighter again with a slimmer recoil pad and going 80fps faster (with the 162 pills)but with RL22

I use H4350 for my 140 Nosler's as well; in fact my rifle likes 60 grains for a bit over 3100 ft/sec.

I tried Re 17 but found I couldn't get to 60 grains w/o pressure signs. At 58 grains, my 140's were moving 3140. I have 56-58 grains loaded for more testing. I think Re 17 is a bit faster burning than H4350 - at least in my rifles.

What primers were you using with the Reloader 17 ? I was told by a target shooter that shoots 7mmWSM that Magnum primers are a must for reloader 17....And the 162amax load reached preasure with 59.5grains for me @3150 (to much streach)...but with 59g of it I got 3080fps and minimal streach and thats was a heavier pill Norma cases (300 necked down) and 215 Fed primers....

That load shoots awesome in my Little 7..

I use Rem 9.5 magnum for all my SAUMs.

It don't suck in my rifle either

Well I had the loads accross the chrony.....the speeds are a bit down ......but the second test of 59.5 also grouped well .385 after you drop the shot I fluffed big time, I also shot the 60.5 and 61 ADI AR2209 (H4350) loads, the 61 had tight lift but the 60.5 was ok, Yet to measure the brass for stretch



I need to test the 60.5 again as the rifle was starting to foul after 20 shots (shot a few 150's to empty the case and have fun as well) 2975fps with the 59.5gr load and 3068 with the 60.5gr load
Will test the loads at 300 next time to see how they go...maybee do some RL17 to see if there is more spead in it with the 140's

I shot my 7mmSAUM with the 140's and Reloader 17 and found my lightest load was a little warm with it having slightly tight lift on the bolt.....But @3330 fps
The next load in my ladder was 1gr up so I will pull the hotter ones and load some smaller stepped loads below and may be one .3 hotter and see how it groups......The load tried was 1.5" @100 so not the best ....but it sure got the speed....and recoil Might fit a brake if I get a hot one grouping

So it's looking like R17 is gaining speed as they say with the 7SAUM's - very interesting

hot!

Even if you brake it, it ain't gonna make your action feel any better. Too hot is just that!

I'm going to guess 80k. Not my cup of tea..