Re: Anyone run a .243win or AI in a 18.5" setup?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bohem</div><div class="ubbcode-body">Win 243 with 107 SMK
40.0gr H4350 @ est. 61 ksi
15" ~ 2460 fps
18.5" ~ 2740 fps
20" ~ 2796 fps
22" ~ 2861 fps
24" ~ 2917 fps
26" ~ 2967 fps
Win 243 with 107 SMK
40.5gr of RL17 @ est. 61.5 ksi
15" ~ 2641 fps
18.5" ~ 2801 fps
20" ~ 2857 fps
22" ~ 2922 fps
24" ~ 2980 fps
26" ~ 3031 fps
That's not the 115gr that you asked for, but I don't have that bullet on my list of projectiles currently.
The higher the overbore ratio on the case, the more hit you're going to take for chopping the barrel short. The 308 and 223 are very tolerant of shorter barrels because the overbore ratios are relatively low (500-650) but the 243 has an OBR of appx 1150-1200 and is much less tolerant (in terms of velocity loss) to an 18.5 vs. 26" tube.
There's always a trade off.
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Still the 107 SMKs @ 2740 seems pretty promising. Just a quick type in JBM and it seems very good for a 1000yd capable shot, this is with a 10mph wind drift. Now that a couple of people have chimed in i realize the 115gr is probably too heavy of a bullet to try to get at decent speeds out of such a short Rig..
@1000
Drop(mil):9.8
Wind(mil):2.5
Velocity (ft/s):1279.6
Also i don't have a .243 set up for any of this. My dad has a youth model .243 he uses as a truck gun, he wont let me load for it or touch it, so it stays shooting 100gr partitions or SSTs, which ever he has on hand. Now in the far future i do plan on having a 18.5" rig and would probably have it chambered in either .243, .243AI, or 6mmSuperLR (would be a tough decision). But i was just simply wondering is all. Right now i'm running a .308. Now if my dad would let me have the youth .243 700 so to speak hehe, i'd have a action and the classic 700 trigger to already start the build. Couple grand later i would have it lol.
