Author Topic: verticle stringing (Read 683 times)

sgtt · « **on:** April 29, 2004, 07:46:42 PM »

I am not sure if this belongs here or in the TC forum. I assume that there is much crossover here................I have a custom built Contender barrel that is stringing terribly.

30 cal. improved version of the 30-30. 28 grns of h4895 150 grn win fp bullet.

Any thoughts?

Castaway · « **Reply #1 on:** April 30, 2004, 12:46:52 AM »

Is it scoped or are you using iron sights?

Iowegan · « **Reply #2 on:** April 30, 2004, 05:58:50 PM »

There are only a few things that cause vertical stringing. As Castaway eluded, check your scope mount and make sure all the screws are tight. Open sights can jar too. If that doesn't fix it, you might be holding the gun different with each shot. Recoil (and that one will certainly produce some) will cause the gun to reposition in your hand and shoot to a different POI. I like to lay my heavy hitters down after each shot, then pick it up again and position it in my hand. The last thing would be your loads. If your powder charge, bullet depth, or crimp is inconsistent, the velocity will change and vertical string the shots.

I'd put my money on an inconsistent hold.

sgtt · « **Reply #3 on:** April 30, 2004, 07:28:37 PM »

My first thoughts were the scope mounts..............They were good. I have developed a theory after reading a bit at another site. I think the lock up on the barrel is inconsistant. This is a custom barrel from a well regarded custom builder and a brand new G2 frame. I am going to try the same barrel on a different frame and see what happens.

Lloyd Smale · « **Reply #4 on:** April 30, 2004, 11:11:44 PM »

one other thing that will cause vertical stringing with heavy loads is not getiing a cosistant grip on the gun hold it with differnt tension each time or not gripping the gun in the exact same spot every time will cause it.

sgtt · « **Reply #5 on:** May 01, 2004, 07:30:16 AM »

I am not using heavy loads. I believe my hold is good. I believe that the barrel is not locking consistantly............some of the energy produced is being used to lock up the barrel.

Castaway · « **Reply #6 on:** May 01, 2004, 08:26:16 AM »

I know you said the grip is good, but have you tried resting it on a sandbag it as far back as possible and at the same place each time. It's possible it may be a barrel harmonic issue with the bullet leaving at a different point when the barrel "whips."

sgtt · « **Reply #7 on:** May 01, 2004, 08:03:51 PM »

It is now on a different frame. I am going to give it a try. If it doesn't work keep your eye on e-bay for a famous custom barrel mfg going cheap........thanks for all the help.

vernonp · « **Reply #8 on:** May 25, 2004, 02:46:01 PM »

I HAVE HAD THIS PROBLEM IN A COUPLE OF RIFLES FROM OVERHEATING. AS THE BARRELL GETS HOTTER THE STRING MOVES UP. I DO NOT KNOW MUICH ABOUT HAND GUNS WITH THE SHORTER BARRELLS BUT WHEN THIS IS HAPPENING IN A RIFLE IT HAS ALWAYS BEEN DUE TO OVERHEATING IN MY EXPERIENCE. GOOD LUCK

jhalcott · « **Reply #9 on:** May 25, 2004, 05:38:06 PM »

Sgtt ,this MIGHT be a primer problem.You don't say how long your barrel is either. Short(10/12") barrels need faster powders. Let us know how the other frame works out. How much vertical stinging are you getting? This can also be caused by inconsistent case /bullet grip. A tighter bullet grip can cause the bullet to hit higher. jh

Swamp Fox · « **Reply #10 on:** May 25, 2004, 07:29:29 PM »

Define stringing terribly.

For some 1" @ 100 is stringing and may be an ammo problem. For multiple inch strings, heed the other advice given.

sgtt · « **Reply #11 on:** May 25, 2004, 10:03:37 PM »

Good point Swamp Fox. I was getting 5" spreads at 50 yds. The different frame did not seem to help. I was in contact with Ed (Ed's contenders) and he suggested that I try the gun without the forarm. I put a screw in the front echlon and went to the range. Stringing gone. Put the forend back on and stringing is back. I am going to use o rings to keep the forend from touching the barrel. Thanks to everyone.

skb2706 · « **Reply #12 on:** May 26, 2004, 06:41:21 AM »

another option if your barrel is from a well known custom house odds are they could do a hanger bar set up for you to accomodate their barrel. The custom shops that I have worked with are wanting you to get the most from the product they sell you. o rings are to fix leaks.......