Author Topic: 22-250 (Read 506 times)

shepherm · « **on:** April 17, 2006, 03:28:51 PM »

Hello all,
I need some help. I have a Remington 700 standard barrel. I am loading 50 grain v-max with 36.1 gr varget. Ok hears my problem my gun is shooting 1" groups cold but when it warms up it's shooting around 1/4". Is this common? I always thought that they shot worst once they got hotter.

PaulS · « **Reply #1 on:** April 17, 2006, 04:35:37 PM »

shepherm,

you might be able to stabilize your group sizes by free floating your barrel and dropping the load a bit. As close as it is to the max loading it is most likely being stabilaized by barrel contact and as the gun heats up, more pressure is applied to the barrel by the stock warping. If you remove all contact between the barrel and stock you may find that the groups are as large as 2 inches. When you drop the powder charge a bit it may settle down and relax the pulses of the barrel, bringing groups into a smaller one than you are getting now.

shepherm · « **Reply #2 on:** April 17, 2006, 05:32:42 PM »

Thanks for the reply PaulS
I guess I should have given more info about my gun. It has a 2 1/2lb trigger and a choate sniper stock. Since the stock is made for a bull barrel mine is very much free floating. I will try to drop the load and see what happens. Thanks again for the reply and any others will be appreciated very much.
Mark

warf73 · « **Reply #3 on:** April 17, 2006, 10:00:53 PM »

My Ruger in 204 will have a larger group with the first 3 shot group about ¾”- 1” then settle in to ½” or less groups from there on.

It doesn’t matter if the bore is clean or dirty when cold. If on a P dog town I can clean the bore clean (not spotless but very clean) and will float the first shot (fouling shot) if the first shot is beyond 200 yards, after that its right on again.

My barrel is floated also (lots of air space) light trigger pull very accurate rifle.

I personally think that this is just that rifles personality that’s part of knowing your rifle and what it does.

Warf

shepherm · « **Reply #4 on:** April 18, 2006, 07:51:39 AM »

Quote

It doesnt matter if the bore is clean or dirty when cold.

Mine is the same way. At first I thought it was the clean bore but I tried a cold dirty bore and it did the same thing. But once its hot it shoots great.
Thanks
Mark

PaulS · « **Reply #5 on:** April 18, 2006, 09:13:44 AM »

Even a plastic stock can have a muzzle end "pressure point" built in to the muzzle end - the only way to be sure that it is free floating is to fire some rounds to heat the barrel and then see if a dollar bill will slip from tip to stem. Most "pressure Points" are placed within five inches of the muzzle.

shepherm · « **Reply #6 on:** April 18, 2006, 02:16:39 PM »

I know there are not pressure points because there is about a 1/2in gap that tapers to 1/4in all the around my barrel. The 1/4 in gap is from the front of the action to 1/2in at end of the stock. I talked to my gunsmith today and he said the barrel may have unwanted stress in the barrel and that it may need a pressure point at the end of the stock. He said that 99% of the guns don't need this but sometime there are the exceptions. Does this sound right to anyone else?
Thanks
Mark

PaulS · « **Reply #7 on:** April 19, 2006, 07:57:06 PM »

shepherm,

You can check it out without modifying the gun by using card stock to build a contact point between the front 2 inches of stock and the barrel. Just layer the card stock until it just fits between the barrel and stock and then add one or two layers for pressure. Take it out and shoot it with the pressure point and see how it does - take a couple of extra pieces with you to add or subtract to see if anything changes. If the barrel has internal stresses you can have it cryo-treated to make it stable.

You can take a towel and run it between the barrel and stock from the front of the stock all the way back to just in front of the action? That is a big gap!