This......if running a short action, stick to a short freebore and use 160tmk or 162 eld bullets.
Would you experienced saum guys recommend building on a short action if I already have the bolt head or would you recommend just building on a long action and selling the bolt face?
I run a short action with 180s and have no problems reaching 2900+ with H4831sc
24" barrel
24" barrel
Not sure I understand this question? Do you have a short action/w mag bolt face? Or do you just have a bolt?
I have a short action with the mag bolt face and standard bolt face. Currently not using the magnum bolt for anything but want to get into a 7 saum
Well if you don’t want to buy another action then the short will work, 180s are pushing so personally I’d stick to 168s or that range of bullets. If you wanna run 180 or heavier I’d get yourself a long action if it were me.
180gr ELD-M loaded to 2.95 with a milled feed ramp in my Bat VR work very well.
If you already have the action and stock I would be tempted to stick with what you have got or stick with the barrel you have on that rifle and buy a second rifle. Always nice to have more than one in the safe.
If you already have the action and stock I would be tempted to stick with what you have got or stick with the barrel you have on that rifle and buy a second rifle. Always nice to have more than one in the safe.
Looking for opinions on powder choice for a recent 7 SAUM build. Was leaning towards either 4831SC or N565, don’t have either in my inventory. Only have 50 rounds through the barrel at this point, and loads have consisted of the following.
Impact NBK short action
20” Benchmark CF 1:8.4
ADG brass (virgin)
175 gr ELD-X at 2.950"
N165……..mainly loaded with 58.5 gr for barrel break-in.
WLR primers, and have shot a few 210M and BR-2’s.
Ran a small ladder with WLR primers to see where I ran into pressure. 60 gr (2700 fps) produced a heavy bolt and ejector swipe.
59.4 gr using the BR-2 is showing promise and averaged 2616 fps with single digit ES & SD’s.
Any help is appreciated and also open to suggestions.
Impact NBK short action
20” Benchmark CF 1:8.4
ADG brass (virgin)
175 gr ELD-X at 2.950"
N165……..mainly loaded with 58.5 gr for barrel break-in.
WLR primers, and have shot a few 210M and BR-2’s.
Ran a small ladder with WLR primers to see where I ran into pressure. 60 gr (2700 fps) produced a heavy bolt and ejector swipe.
59.4 gr using the BR-2 is showing promise and averaged 2616 fps with single digit ES & SD’s.
Any help is appreciated and also open to suggestions.
N560 will also do quite well especially out of a short barrel.
If you’re coal limited to short action at 2.950 I would seriously consider the 162 ELDM.
The 162 will come out faster, with less recoil and more optimized burn rate out of a 20in barrel by using a faster powder. The BCs are also pretty close.
This might help you get started. QL shows bit more speed out of a 20in barrel with N560, both in the 162 and 175.
Just for reference, QL shows 62.3K PSI at 60gr for N165 so it does sounds right that you'd get heavy bolt and ejector swipe.
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All be it with a 26” barrel my 7 SAUM runs really well on N560 with both a 180 and 162gr ELD-M. The recoil with the 162gr bullet is noticeably less but the BC of the 180’s is just too good to give up on when pushing distance. The 175gr ELD-X is a very long bullet yet the BC advantage versus the 162’s is minimal.
I'll add 7828ssc if you can find any. Not sure about grabd, but hunter and magnum in ramshot will work. Imr and h of 4831have good case fill, but will yield slower velocities than magnum, 560 or 7828ssc will.
N560 working very well with the 160 in this cartridge. Old RCBS Chargemaster and x2 ADG brass. 100-125FPS faster than H4831SC. No pressure on any loads at 45F approx 2500' DA. Primers were CCI BR2
162 ELDM 2.945in 62.5gr 2995 FPS SD 7 ES 18 1/2 moa 5 shots
162 ELDM 2.945in 63.0gr 3025 FPS SD 4.8 ES 12
160 TMK 2.945in 62.5gr 3003 FPS SD 4.3 ES 12 0.30 moa 5 shots
160 TMK 2.945in 63.0gr 3024 FPS SD 7 ES 19 0.20 moa 5 shots
160 TMK 2.945in 63.5gr 3050 FPS - no groups.
166 ATIPs 2.985in (single feed) - 61.5gr 2925 FPS - no groups.
Most likely just settle for the 62.5 160 TMK load as it's only going to get warmer and 3000FPS is more than enough for this 24in build.
Quickload gives me 63K PSI for this load at 100F which sounds about right
162 ELDM 2.945in 62.5gr 2995 FPS SD 7 ES 18 1/2 moa 5 shots
162 ELDM 2.945in 63.0gr 3025 FPS SD 4.8 ES 12
160 TMK 2.945in 62.5gr 3003 FPS SD 4.3 ES 12 0.30 moa 5 shots
160 TMK 2.945in 63.0gr 3024 FPS SD 7 ES 19 0.20 moa 5 shots
160 TMK 2.945in 63.5gr 3050 FPS - no groups.
166 ATIPs 2.985in (single feed) - 61.5gr 2925 FPS - no groups.
Most likely just settle for the 62.5 160 TMK load as it's only going to get warmer and 3000FPS is more than enough for this 24in build.
Quickload gives me 63K PSI for this load at 100F which sounds about right
