Home Forums Reloading Big Game Rifles 7SAUM - AGAIN

supercrewed,
PM sent with e-mail address.. Thanks!

Same here!

sent

Got it, thanks!

Thanks supercrewed,
I have been looking for that Lane Pearce article you sent for some time as I have a model 7/7SAUM like he tested... His accuracy/groups looked kinda crappy until I read the fine print at the bottom of the page..Really looking forward to some range time now..

Im pushing 160gr Accubonds to 2980 fps with 66grs RL25 (26" brl m700 Sendero SF)

I have a 7mmSAUM as well in a Mod7 but with a 24" tube (std Taitanium barrel) 162 amax @ 3080fps with RL-17 3150fps was getting pretty warm

I have not put the RL-22 150's load over the chrony but they group great and is only my bush load so they will be fast enough....did chrony 2gr less and got over 3000fps so I guess around 3100fps?

Going to load some 140gr VLD's to see how they go....Just because I have some :P

Here's some data from some shooting I did for a magazine article. My rifle is a Remington 700 BLD stainless/synthetic made around 2002, with a 24" barrel:

Hornady 139 Spire Point H4350-60.0 3152 .49
Hornady 139 Spire Point H100V-62.0 3285 .69
Sierra 160 GameKing RL-25-66.0 3044 .87
Sierra 160 GameKing Magnum-68.0 3036 .93
Nosler 175 Partition RL-22-59.0 2872 1.44

I've taken around a dozen animals with the 7mm SAUM, pigs, whitetails and caribou. It works very well, and should, since it's a short-action version of the .280 Remington Ackley Improved.

If you can find some try 59grns of VV N550 with a COAL 2.7860 lit with a FED215GM and shoot BUG HOLES!!!!!!!!!!!!!!

Curious MD, were the 139 Hornady bullets BT or flat base?

I bought the same gun back when they were cheap, based soley on a mag article of yours several years ago.

The Hornadys were flat-base.

I get blamed for all sorts of stuff! Though this particular rifle is one of the most accurate OTB factory rifles I've ever owned. It shoots factory loads really well too.

Well I loaded some 140 VLD's with AR2209 (H4350)59-61gr in .5gr steps to run over the chrony and test the groups, Done at mag length so it will have a fair jump as I dont want to single load...have 2217 as well but not the V...that one is new to me

I have a short thraot reamer on the way to get the 162 amax on the lands in the mag if required so will help get the vld closer as well

Vit powder is not that easy to come by over here but 550 is one of the better stocked ones and one I want to try is other rifles as well so may get some if these don't work....tried N560 in my 243AI but the speeds caped out a little earlier with preasure 100fps slower than AR2209...

Fine frosty day so hope to get out after I finish work

62 grains of R22 and 140 Accubomb net me 3050. (M700) I know there's room for improvement(and space) with regards to velocity but it'd be hard to improve upon the accuracy.

I believe I have the exact same rifle. I can't near 3000 with a 160 using Re 25 and Magnum. 66 Re 25 nets me 2943, 68 Magnum gets 2963. I've been trying to get to 3000 with a 160 Partition but can't seem to get there. At 2950, accuracy is good so I'm not sweating the extra 50-100 ft/sec.

I've grown quite attached to the little 7. I've shot 4-5 animals with it since I picked it up 2 years ago. It is an honest rifle. The average group size in my rifle for all loads shot through it is 1.51" for 3 shots. Have shot numerous sub 1" groups - especialy with H4831 and Re 22. The problem is that the velocity is a shade less than 2900 for both.

Thanks for the info.

bw

I fail to see where the problem is here. Looks good to me. If it can do 2" or under at 200yds you'll have a mighty fine shooter.

WN

Don't necessarily disagree, maybe "problem" isn't the right word. Curious would be better - I know of 2-3 other folks that routinely break 3000 with a 160 in their 7SAUM's. Not a huge issue but one I am curious about why I can't get there with mine.

bw

I know what you mean. I have a 270 that acts the same way. It should be about 100fps faster but is so darn accurate out to 400 I just gave up and feed it what it likes. Can't say I'm disappointed just curious, like you.

WN

the tighter chambers will get more speed per powder use....also if you have a longer throat and load for the mag you will drop a bit of speed......then there is temp and Altitude..... Do you get preasure signs with your near 3k?

59.5gr of AR22009 (4350) gave the best group but didn't fire the 60.5 and 61 loads as faiding light meant the chrony wouldn't read the speeds .... slightly tight lift on the bolt at 60 but with no speeds I will load 59.5 again and if it is slow I will shoot the hotter ones....But the 4 shot group went in .475 and if I drop one the rest were .248 and all three groups I shot had similar POI and a total group of 1.2" so I hope it wont be affected to much by temp and Alt.

I haven't gone above the published charges because with every other bullet I've tried in it - mainly 140's, it behaves "correctly" - I get close or even exceed a bit what the books say. I have a few rifles that when Hodgdon says I should get X velocity with ABC bullet/powder/primer combo I get very close to X. For example, my rifle likes H4831 and Re 22 with 160's. My loads are: Re 22, 59.0 for 2870, H4831, 59.5, for 2906. The Lyman manual says I should get 2972 and 2884, Nosler says 2942, 2901, respectively. The H4831 is close enough, Re 22 is not.

With Magnum and Re 25 loaded at 68/3020, and 66/3024, I get 2940 and 2943 at those charges. Weirdly with 140's I'm always catious when approaching max because I "tend" to get more velocity with stated charges than the books say. I don't own magic rifles and when my components exactly match presure tested loads, I tend to heed the velocity readings more than the charge.

I will say I've had similar circumstances with Re 22 before in different cartridges. Not so much wih Re 25, and just about never with Re 15.