I was not intending on building a blind magazine gun hence me going away from the short and XM action due to limited or no magazine possibilities. The gun will mainly be used for bench shooting but may occasionally take it hunting as well. Its a 1-8.6" twist as well. I want to get as much accuracy out of the gun, using reloads. mines 24 and shoots great, i cant see a whole lot being differnt aside from of a touch of speed. If you intend to load bullets to factory spec then go with the short action. I guess it would just limit my loading capabilities. They claim a 9 twist is plenty fast for the 180's coming out of the larger 7's but I've got a shillen 8 twist 30" on my 7 stw shooting 180 smk's and it will shoot around half inch groups at 250 yds as will my wsm shooting 180 jlk's with a 8.6 twist. yea, i'd guess ~ 50 fps loss by going from 24" to 23". The bolt face is a standard .532 since its rebated like the parent rounds.
Any .284 7mm calibers you guys suggest now that I’m going long action . Re: 7WSM barrel length? Anyone else who has an xm defiance action confirm what manners said with the bottom metal? Any opinions or suggestions would be appreciated. Can't do no better than a ought 6 and Core Logs. Manners told me they could do the xm size but they mentioned that the action has its own custom bottom metal and they need me to have defiance call and discuss the dimensions per specific serial number. So I settled on the long action defiance.. too many things could go wrong. Gives 3.2" of mag box. Any opinions or suggestions would be appreciated. You must log in or register to reply here. #5810997 11/14/11: Joined: Feb 2011. I will probably be shooting 168 bergers most likely but maybe 180's haven't decided yet probably do both and see which shoots better. Either way has nothing to do with accuracy honestly, it's just a matter of choice. If you intend to extend the length out of the spec for the short action magazine then go with the long action to accommodate. Forums User List Calendar Active Threads Forum Help: Previous Thread: Next Thread : Print Thread: Hop To : Page 1 of 2 : 1: 2: 7WSM barrel length? This is a shooting forum, there is no place here for logic. I didn't like the load. So now that I’m settled on long action the 7WSM is out and it’s looking like 7mm RUM.  #581100 #5811001 On paper the 7 WSM with the 162 A-Max or 175 SMK really out-performs both the 300 WM and the 300 WSM, two of my favorite calibers. I am building a 7mm wsm on a savage long action and was curious about the optimum barrel length. Nothing fancy mind you, just plain jane will get it done with style. I think you'd be fine with in between a 8-9 twist just my opinion though. I also have a 7WSM built on a FN SPR action giving me 3.05" of mag box. Belligerents. RHutch Sergeant. Anyone out there with experience on both sides, especially with the defiance deviant action. Anybody run a 23 inch tube on one?
I am a huge fan of the 300 WSM and will always be, but this 7mm is really starting to change my mind. The bottom metal thing is correct....I have it on my 300WSM. Coyote Hunting - From 10 Yards to over 1,000 Yards. I know that 300 Whizzum has a 23 inch pipe... Really like that rig. After today I’m fully confused on the xm action, and having defiance blow me off when I tried to get the details and buy an action from them isn’t helping much.
I'm getting awesome performance with 69grs of Re#19 behind Hornady 139gr SST MV 3300 FPS and under 1/4 MOA......... BTW I'll part with the Berger 168gr bullets if your interested ? I'd not sweat one inch off the "norm".
The 7 WSM offers a flatter trajectory and the high-BC bullets carry energy out to long range really well.