Vmatch accuracy problems
I have a RR upper bolted onto a Del-Ton lower that was and is delivering erratic accuracy. This is a full bull ss RR barrel. I assume Wilson. I have determined that the saddle type shooting rest that I have used to work up loads seems to influence the lack of tension between the upper and lower. I assume sand bags would provide the same affect. Thus the erratic accuracy. When I pull down sterny on the magizine to assert downward pressure into the saddle, my accuracy is incredible. Bullet holes almost touch at 200 yds (69 SMK with 23 grains of IMR 8208) . I have an accu wedge installed but it still can't keep upper and lower tight as needed. I understand that there are split take down pins that force tension between the lower and upper at the rear, but there is too much play still left at the pivot pin in front of magazine. I dont use this firearm as a field gun. It is way too heavy. I had hope that someone knows how to BOLT both lower and upper togather so that there is absolutely no movenment, but as it exists now, recoil causes both units to move slightly at firing, much like a bolt gun would slip and move in an unbedded stock. Any suggestions on how to fix this?? I don't believe that there are split pins for the front.
Everything I have ever been told was that upper/lower slop has nothing to do with accuracy.
Is the barrel free floated?
Barrel is Wylde chambered and has free floating tube. I hand load IMR 8208/69 SMK within pressure boundaries and have not seen any signs of excessive or erratic pressure. Torque is within specs on barrel and tube. Even though barrel has free floating tube, I must be cautious when placing tube's position on sand bag or/and homemade saddle and the amount of downward pressure applied. Groups rise if I lay tube in saddle or bag near front sight (not touching of course) and sternly pull down on mag. (to be expected) But this positioning and pressure seems to be necessary for balance of the 24" full bull barrel. AND, it is real easy to apply too much tube pressure and raise groups 1" or 2". However, this method seems to minimize slop, and groups really tighten. Yet, it is not practical to rely on always having sand bags, saddle and remembering where to apply forward pressure and how much pressure to apply. I'd prefer to figure out a way to minimize "slop" on my upper/lower and then only have to worry about positioning my hand on tube when I am varmint hunting.
I thought about split pins for both take down and hinge pin, but I have not been able to find one for the hinge.
Another possibility might be to use split pin on rear and use a lock nut/bolt combination for front hinge? Since upper and lower are aluminum, I am fearful of using a bolt on the hinge.
If you or other have a remedy, please respond.
They do make a split rear take down pin that requires an allen wrench to tighten and will eliminate wiggle.
I don't think they make anything like that for the front pivot pin.
But I really don't think that's your issue here. Sounds to me like the barrel nut might be loose.